CN109471828A - A kind of multifunctional serial port card and working method based on XMC standard interface - Google Patents
A kind of multifunctional serial port card and working method based on XMC standard interface Download PDFInfo
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- CN109471828A CN109471828A CN201811157771.6A CN201811157771A CN109471828A CN 109471828 A CN109471828 A CN 109471828A CN 201811157771 A CN201811157771 A CN 201811157771A CN 109471828 A CN109471828 A CN 109471828A
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
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Abstract
A kind of multifunctional serial port card based on XMC standard interface, including XMC P15 connector, XMC P16 connector, serial ports controller, power isolation circuit, signal isolation circuit, wire jumper selecting unit, RS232 bus transceiver, RS422 bus transceiver, RS485 bus transceiver and standard x MC template backboard；For the selection to RS232, RS422 and RS485 function；It is connected firmly, freedom from vibration is strong；Safety and reliability is high.
Description
Technical field
The present invention relates to XMC(XMC-compliant mezzanine card, switched mezzanine cards) standard interface card field,
More particularly, to a kind of multifunctional serial port card and working method based on XMC standard interface.
Background technique
With the development of modern processors technology, in interconnection field, it is using high-speed-differential bus substitution parallel bus
Trend of the times.Compared with single-ended parallel signal, higher clock frequency is can be used in high-speed differential signal, thus using less
Signal wire, the bus bandwidth for needing many single-ended parallel data-signals can be only achieved before completing.PCIE(Peripheral
Component Interconnect Express, peripheral component interconnection extension) bus is exactly to have used high-speed-differential bus, makes
It has many advantages, such as that message transmission rate is fast, extension is flexible.It is with the obvious advantage due to PCIE, in nearly all modern times PC
In (Personal Computer, personal computer) machine, PCIE bus is interconnected as main mainboard grade, at host system
Reason device is connected with integrated peripheral hardware, and can be with additional peripheral devices expansion card.
A kind of interface form of the XMC as PCIE bus has compared with other interfaces such as golden finger and connects firm, antivibration
Move the features such as property is strong.Since its is with the obvious advantage, so XMC interface is widely used in ruggedized computer, as expansion interface
Plate come using.Therefore, it is highly desirable to design the function card of a XMC interface.
Summary of the invention
The purpose of the present invention is to provide a kind of multifunctional serial port cards and working method based on XMC standard interface, it can
To make up the deficiencies in the prior art, it is that a kind of structure is simple, is connected firmly, the serial port board that reliability and safety is high and method,
Effective selection to serial port function may be implemented.
A kind of technical solution of the present invention: multifunctional serial port card based on XMC standard interface, it is characterised in that it includes:
XMC P15 connector, XMC P16 connector, serial ports controller, power isolation circuit, signal isolation circuit, wire jumper selection are single
Member, RS232 bus transceiver, RS422 bus transceiver, RS485 bus transceiver and standard x MC template backboard；Wherein, described
XMC P15 connector, XMC P16 connector, serial ports controller, power isolation circuit, signal isolation circuit, wire jumper selection are single
Member, RS232 bus transceiver, RS422 bus transceiver, RS485 bus transceiver are integrated on standard x MC template backboard；
The input terminal of the XMC P15 connector connects external+5V power supply, while receiving external PCIE signal, output end and power supply
Isolation circuit connection, while being in be bi-directionally connected with serial ports controller；In double between the serial ports controller and signal isolation circuit
To connection；The RS232 bus transceiver, RS422 bus transceiver and RS485 bus transceiver respectively with signal isolation circuit
Output end, wire jumper selecting unit input terminal unidirectionally connect, with the input terminal of XMC P16 connector in being bi-directionally connected；It is described
Serial ports controller, signal isolation circuit, RS232 bus transceiver, RS422 bus transceiver and RS485 bus transceiver difference
By+5V_S the power supply power supply after power isolation circuit is isolated；The output end of the XMC P16 connector exports rs 232 serial interface signal.
The power isolation circuit is by isolated from power chip DCP010505B, resistance R155, resistance R148, capacitor C14
It is constituted with capacitor M58；The isolated from power chip DCP010505B have VS terminal, two 0V terminals ,+VOUT terminal, NC terminal,
SynIN terminal and SynO terminal；The one end the resistance R155 connects external+5V voltage, and one end connects resistance R148；The resistance
The other end of R148 is grounded；The resistance R155 connects SynIN terminal with the intermediate connection point of resistance R148；The NC terminal is set
It is empty；Voltage+5V_S after the+VOUT terminal output isolation；Described two 0V terminals, the earth signal before a connection isolation
GND, an earth signal GND_S connect after isolation；The capacitor C14 and capacitor M58 are connected in parallel, and one terminates external+5V voltage,
Other end ground connection；The VS terminal is connect with outside+5V power supply.
The signal isolation circuit is made of signal isolation chip ADuM3401, resistance R137, resistance R138；The letter
Number isolating chip ADuM3401 has VDD1 terminal, VDD2 terminal, two GND1 terminals, two GND2 terminals, VIA terminal, the end VIB
Son, VIC terminal, VID terminal, VOA terminal, VOB terminal, VOC terminal, VOD terminal, VE1 terminal and VE2 terminal；The end VE1
Son connect with resistance R137 after with VDD2 terminal access+5V power supply jointly；The VE1 terminal connect with resistance R138 after with VDD1
Terminal is commonly connected to+5V_S voltage；Described two GND1 terminals and two GND2 terminals are grounded respectively；The VIB terminal and
VOB terminal empties；The VIC terminal and VOC terminal empty；The RXD_A1 of the VIA terminal while tie jumper selecting unit
Terminal, RXD_A2 terminal and RXD_A3 terminal, the UART_S_RXD signal that VIA terminal receives the output of wire jumper selecting unit pass through
From terminal VOA output UART_RXD signal to serial ports controller after the isolation of chip interior logic circuit, UART_ is thereby realized
S_RXD signal and UART_RXD signal isolation；After the VID terminal receives the UART_TXD signal by serial ports controller output
UART_S_TXD signal is exported to RS232 bus transceiver, RS422 from terminal VOD after the isolation of chip interior logic circuit
Bus transceiver and RS485 bus transceiver, thereby realize UART_TXD signal and UART_S_TXD signal isolation.
The RS232 bus transceiver be by RS232 bus transceiving chip ADM213EARSZ, capacitor M20, capacitor M16,
Capacitor M17, capacitor M21 and capacitor M25 are constituted；The RS232 bus transceiving chip ADM213EARSZ has C1+ terminal, the end C1-
Son, C2+ terminal, C2- terminal, T1IN terminal, T2IN terminal, T3IN terminal, T4IN terminal, T1OUT terminal, T2OUT terminal,
T3OUT terminal, T4OUT terminal, R1OUT terminal, R2OUT terminal, R3OUT terminal, R4OUT terminal, R5OUT terminal, the end R1IN
Son, R2IN terminal, R3IN terminal, R4IN terminal, R5IN terminal, EN terminal ,-SHDN terminal, GND terminal, V- terminal, V+ terminal
And VCC terminal；Connection is isolated through capacitor M20 between the C1+ terminal and C1- terminal；Between the C2+ terminal and C2- terminal
It is isolated through capacitor M16 and connects；The EN terminal and-SHDN terminal are shorted the enabled input terminal as RS232；The T3IN terminal
Receive UART_S_TXD signal by the VOD terminal output of signal isolation chip ADuM3401 it is converted after from T3OUT terminal
RX232_TX signal is exported to XMC X16 connector；The R4IN terminal receives the RS232_ exported by XMC X16 connector
It is converted after RX signal from R4OUT terminal and is output to wire jumper selecting unit RXD_B1 terminal；The T4IN terminal ground；It is described
R1OUT terminal, R2OUT terminal, R3OUT terminal, R5OUT terminal, R1IN terminal, R2IN terminal, R3IN terminal, R5IN terminal,
T1IN terminal, T2IN terminal, T1OUT terminal and T2OUT terminal empty.
The RS485 bus transceiver is by RS485 bus transceiving chip ADM485ARZ, digital inverter
74V1G14STR, signal amplifier SN74AHC1G125, resistance R17, resistance R15, resistance R20, resistance R21, resistance R22 and electricity
Hold M11 to constitute；The input terminal of the digital inverter 74V1G14STR receives the UART_S_ after the isolation of signal isolation chip
TXD signal, the input terminal of output end connection signal amplifier SN74AHC1G125, power end receive the+5V_S voltage after isolation；
The output end of the signal amplifier SN74AHC1G125 connects RS485 bus transceiving chip ADM485ARZ, and power end receives
+ 5V_S voltage after isolation, enable end connect the enable end EN of RS232 bus transceiver；The RS485 bus transceiving chip
ADM485ARZ has RO terminal, RE terminal, DE terminal, DI terminal, VCC terminal, A terminal, B terminal and GND terminal；The end RO
Son connection resistance R20 and wire jumper selecting unit；+ 5V_S voltage after the other end connection isolation of the resistance R20；The end RE
Son is grounded through resistance R15；The output end of the DE terminal connection signal amplifier SN74AHC1G125；The DI terminal is through resistance
R17 is connect with the VOD terminal of signal isolation chip ADuM3401；+ 5V_S voltage after the VCC terminal connection isolation, and pass through
Capacitor M11 is isolated and is grounded；The A terminal connects XMC P16 connector with B terminal；The GND terminal ground connection；The A terminal
It is grounded respectively through resistance R22 and resistance R21 with B terminal.
The RS422 bus transceiver is by RS422 bus transceiving chip ADM485ARZ, resistance R19, resistance R28, electricity
R34, resistance R33 and capacitor M11 is hindered to constitute；The RS422 bus transceiving chip ADM485ARZ has RO terminal, RE terminal, the end DE
Son, DI terminal, VCC terminal, A terminal, B terminal and GND terminal；RO terminal connection resistance R19 and wire jumper selecting unit
RXD_B2 terminal；+ 5V_S voltage after the other end connection isolation of the resistance R19；The RE terminal and DE terminal are through resistance
R28 ground connection；The DI terminal empties；+ 5V_S voltage after the VCC terminal connection isolation, and be isolated and connect through capacitor M13
Ground；The A terminal and B terminal are the signal input parts of RS422 bus transceiver, connect XMC P16 connector；The end GND
Son ground connection；The A terminal and B terminal are grounded through resistance R34 and resistance R33 respectively.
The wire jumper selecting unit is made of the contact pin and R67 of 2x4 PIN；The spacing of the contact pin of the 2x4 PIN is
2.54mm；The contact pin is by EN# terminal, RXD_A1 terminal, RXD_A2 terminal, RXD_A3 terminal, RXD_B1 terminal, the end RXD_B2
Son, RXD_B3 terminal, GND_S terminal are constituted；The EN terminal is connected on+5V_S power supply through R67 resistance；The EN terminal with
The EN terminal and-SHDN terminal of RS232 bus transceiving chip ADM213EARSZ connects while and signal amplifier
The enable end of SN74AHC1G125 connects；The GND_S terminal ground；The RXD_A1 terminal, RXD _ A2 terminal, RXD_A3
It is connect with the VIA terminal of signal isolation chip ADuM3401；The RXD_B1 terminal and RS232 bus transceiving chip
The connection of R4OUT terminal；The RXD_B2 terminal is connect with the RO terminal of RS422 bus transceiving chip；The RXD_B3 terminal with
The RO terminal of RS485 bus transceiving chip connects.
A kind of working method of the multifunctional serial port card based on XMC standard interface, it is characterised in that it the following steps are included:
(1) selection method of RS232 function:
1. when the EN terminal and GND_S terminal that are not shorted CN1, the RS232 bus transceiving chip that is connect in this way with the EN terminal of CN1
The signal that the EN terminal of ADM213EARSZ receives is high level signal, and chip is in running order at this time, ensure that RS232
Data transmitting channel is unimpeded；
2. the signal that the enable end for the signal amplifier SN74AHC1G125 simultaneously, connecting with the EN terminal of CN1 receives
For high level signal, device is in off working state, RS422 and RS485 data transmitting channel is interrupted at this time；
3. not being shorted RXD_A2 terminal and RXD_B2 terminal when the RXD_A1 terminal and RXD_B1 terminal that are shorted CN1, not being shorted
RXD_A3 terminal and RXD_B3 terminal, the VIA terminal and RS232 bus transceiving chip of such signal isolation chip ADuM3401
The R4OUT terminal of ADM213EARSZ has been connected in together, has reached that RS232 serial ports receiving channel is unimpeded while RS422 and RS485
The purpose that data receiving channel interrupts, realizes the selection of RS232 function.
(2) selection method of RS422 function:
1. when the EN terminal and GND_S terminal that are shorted CN1, the signal amplifier being connect in this way with the EN terminal of CN1
The signal that the enable end of SN74AHC1G125 receives be low level signal, device is in running order, ensure that RS422 and
RS485 data transmitting channel is unimpeded.
2. the EN terminal for the RS232 bus transceiving chip ADM213EARSZ simultaneously, connecting with the EN terminal of CN1 connects
The signal received is low level signal, and chip is in off working state at this time.At this point, RS232 data transmit-receive channel is interrupted.
3. it is not shorted RXD_A1 terminal and RXD_B1 terminal when the RXD_A2 terminal and RXD_B2 terminal that are shorted CN1, it is not short
Connect RXD_A3 terminal and RXD_B3 terminal, the VIA terminal and RS422 bus transceiving chip of such signal isolation chip ADuM3401
The RO terminal of ADM213EARSZ has been connected in together, has reached that RS422 serial ports receiving channel is unimpeded while RS485 data receiver is logical
The purpose that road interrupts, realizes the selection of RS422 function.
(3) selection method of RS485 function:
1. when the EN terminal and GND_S terminal that are shorted CN1, the signal amplifier being connect in this way with the EN terminal of CN1
The signal that the enable end of SN74AHC1G125 receives is low level signal, device is in running order ensure that RS422 and
RS485 data transmitting channel is unimpeded.
2. the EN terminal for the RS232 bus transceiving chip ADM213EARSZ simultaneously, connecting with the EN terminal of CN1 connects
The signal received is low level signal, and chip is in off working state at this time.At this point, RS232 data transmit-receive channel is interrupted.
3. not being shorted RXD_A1 terminal and RXD_B1 terminal simultaneously when the RXD_A3 terminal and RXD_B3 terminal that are shorted CN1
It is not shorted RXD_A2 terminal and RXD_B2 terminal, VIA terminal and RS485 the bus transmitting-receiving of such signal isolation chip ADuM3401
The RO terminal of chip ADM213EARSZ has been connected in together, has reached that RS485 serial data receiving channel is unimpeded while RS422 connects
The purpose for receiving channel interrupt, realizes the selection of RS485 function.
Superiority of the invention: have the characteristics that be connected firmly using XMC standard interface, freedom from vibration it is strong；It is set on board
In respect of power supply and signal isolation circuit, damage of the illegal voltage misquoted from outside to component in plate can be effectively prevented,
Improve the safety and reliability of board；Board can realize tri- kinds of RS232, RS422 and RS485 by wire jumper selecting unit
The selection of function.
Detailed description of the invention
Fig. 1 is a kind of overall architecture schematic diagram of the multifunctional serial port card based on XMC standard interface involved by the present invention.
Fig. 2 is the structure of power isolation circuit in a kind of multifunctional serial port card based on XMC standard interface involved by the present invention
Schematic diagram；
Fig. 3 is the structural representation of signal isolation circuit in a kind of multifunctional serial port card based on XMC standard interface involved by the present invention
Figure；
Fig. 4 is the circuit knot of RS232 bus transceiver in a kind of multifunctional serial port card based on XMC standard interface involved by the present invention
Structure schematic diagram；
Fig. 5 is the circuit knot of RS485 bus transceiver in a kind of multifunctional serial port card based on XMC standard interface involved by the present invention
Structure schematic diagram；
Fig. 6 is the circuit knot of RS422 bus transceiver in a kind of multifunctional serial port card based on XMC standard interface involved by the present invention
Structure schematic diagram；
Fig. 7 shows for wire jumper selecting unit circuit structure in a kind of multifunctional serial port card based on XMC standard interface involved by the present invention
It is intended to.
Specific embodiment
Embodiment: a kind of multifunctional serial port card based on XMC standard interface, as shown in Figure 1, it is characterised in that it includes:
XMC P15 connector, XMC P16 connector, serial ports controller, power isolation circuit, signal isolation circuit, wire jumper selection are single
Member, RS232 bus transceiver, RS422 bus transceiver, RS485 bus transceiver and standard x MC template backboard；Wherein, described
XMC P15 connector, XMC P16 connector, serial ports controller, power isolation circuit, signal isolation circuit, wire jumper selection are single
Member, RS232 bus transceiver, RS422 bus transceiver, RS485 bus transceiver are integrated on standard x MC template backboard；
The input terminal of the XMC P15 connector connects external+5V power supply, while receiving external PCIE signal, output end and power supply
Isolation circuit connection, while being in be bi-directionally connected with serial ports controller；In double between the serial ports controller and signal isolation circuit
To connection；The RS232 bus transceiver, RS422 bus transceiver and RS485 bus transceiver respectively with signal isolation circuit
Output end, wire jumper selecting unit input terminal unidirectionally connect, with the input terminal of XMC P16 connector in being bi-directionally connected；It is described
Serial ports controller, signal isolation circuit, RS232 bus transceiver, RS422 bus transceiver and RS485 bus transceiver difference
By+5V_S the power supply power supply after power isolation circuit is isolated；The output end of the XMC P16 connector exports rs 232 serial interface signal.
The power isolation circuit is by isolated from power chip DCP010505B, resistance R155, resistance R148, capacitor C14
It is constituted with capacitor M58, as shown in Figure 2；The isolated from power chip DCP010505B has VS terminal, two 0V terminals, the end+VOUT
Son, NC terminal, SynIN terminal and SynO terminal；The one end the resistance R155 connects external+5V voltage, and one end connects resistance
R148；The other end of the resistance R148 is grounded；The resistance R155 connects the end SynIN with the intermediate connection point of resistance R148
Son；The NC terminal empties；Voltage+5V_S after the+VOUT terminal output isolation；Described two 0V terminals, a connection
Earth signal GND, an earth signal GND_S connect after isolation before isolation；The capacitor C14 and capacitor M58 are connected in parallel, one end
Connect outside+5V voltage, other end ground connection；The VS terminal is connect with outside+5V power supply.
The signal isolation circuit is made of signal isolation chip ADuM3401, resistance R137, resistance R138；The letter
Number isolating chip ADuM3401 has VDD1 terminal, VDD2 terminal, two GND1 terminals, two GND2 terminals, VIA terminal, the end VIB
Son, VIC terminal, VID terminal, VOA terminal, VOB terminal, VOC terminal, VOD terminal, VE1 terminal and VE2 terminal；The end VE1
Son connect with resistance R137 after with VDD2 terminal access+5V power supply jointly；The VE1 terminal connect with resistance R138 after with VDD1
Terminal is commonly connected to+5V_S voltage；Described two GND1 terminals and two GND2 terminals are grounded respectively；The VIB terminal and
VOB terminal empties；The VIC terminal and VOC terminal empty；The RXD_A1 of the VIA terminal while tie jumper selecting unit
Terminal, RXD_A2 terminal and RXD_A3 terminal, the UART_S_RXD signal that VIA terminal receives the output of wire jumper selecting unit pass through
From terminal VOA output UART_RXD signal to serial ports controller after the isolation of chip interior logic circuit, UART_ is thereby realized
S_RXD signal and UART_RXD signal isolation；After the VID terminal receives the UART_TXD signal by serial ports controller output
UART_S_TXD signal is exported to RS232 bus transceiver, RS422 from terminal VOD after the isolation of chip interior logic circuit
Bus transceiver and RS485 bus transceiver, thereby realize UART_TXD signal and UART_S_TXD signal isolation, such as scheme
Shown in 3.
As shown in figure 4, the RS232 bus transceiver is by RS232 bus transceiving chip ADM213EARSZ, capacitor
M20, capacitor M16, capacitor M17, capacitor M21 and capacitor M25 are constituted；The RS232 bus transceiving chip ADM213EARSZ has C1
+ terminal, C1- terminal, C2+ terminal, C2- terminal, T1IN terminal, T2IN terminal, T3IN terminal, T4IN terminal, T1OUT terminal,
T2OUT terminal, T3OUT terminal, T4OUT terminal, R1OUT terminal, R2OUT terminal, R3OUT terminal, R4OUT terminal, the end R5OUT
Son, R1IN terminal, R2IN terminal, R3IN terminal, R4IN terminal, R5IN terminal, EN terminal ,-SHDN terminal, GND terminal, the end V-
Son, V+ terminal and VCC terminal；Connection is isolated through capacitor M20 between the C1+ terminal and C1- terminal；The C2+ terminal and C2-
It is isolated between terminal through capacitor M16 and connects；The EN terminal and-SHDN terminal are shorted the enabled input terminal as RS232；It is described
T3IN terminal receive by signal isolation chip ADuM3401 VOD terminal output UART_S_TXD signal it is converted after from
T3OUT terminal exports RX232_TX signal to XMC X16 connector；The R4IN terminal receives defeated by XMC X16 connector
It is converted after RS232_RX signal out from R4OUT terminal and is output to wire jumper selecting unit RXD_B1 terminal；The T4IN terminal
Ground connection；The R1OUT terminal, R2OUT terminal, R3OUT terminal, R5OUT terminal, R1IN terminal, R2IN terminal, R3IN terminal,
R5IN terminal, T1IN terminal, T2IN terminal, T1OUT terminal and T2OUT terminal empty.
As shown in figure 5, the RS485 bus transceiver is by RS485 bus transceiving chip ADM485ARZ, digital inverse
Device 74V1G14STR, signal amplifier SN74AHC1G125, resistance R17, resistance R15, resistance R20, resistance R21, resistance R22 and
Capacitor M11 is constituted；The input terminal of the digital inverter 74V1G14STR receives the UART_S_ after the isolation of signal isolation chip
TXD signal, the input terminal of output end connection signal amplifier SN74AHC1G125, power end receive the+5V_S voltage after isolation；
The output end of the signal amplifier SN74AHC1G125 connects RS485 bus transceiving chip ADM485ARZ, and power end receives
+ 5V_S voltage after isolation, enable end connect the enable end EN of RS232 bus transceiver；The RS485 bus transceiving chip
ADM485ARZ has RO terminal, RE terminal, DE terminal, DI terminal, VCC terminal, A terminal, B terminal and GND terminal；The end RO
Son connection resistance R20 and wire jumper selecting unit；+ 5V_S voltage after the other end connection isolation of the resistance R20；The end RE
Son is grounded through resistance R15；The output end of the DE terminal connection signal amplifier SN74AHC1G125；The DI terminal is through resistance
R17 is connect with the VOD terminal of signal isolation chip ADuM3401；+ 5V_S voltage after the VCC terminal connection isolation, and pass through
Capacitor M11 is isolated and is grounded；The A terminal connects XMC P16 connector with B terminal；The GND terminal ground connection；The A terminal
It is grounded respectively through resistance R22 and resistance R21 with B terminal.
As shown in fig. 6, the RS422 bus transceiver be by RS422 bus transceiving chip ADM485ARZ, resistance R19,
Resistance R28, resistance R34, resistance R33 and capacitor M11 are constituted；The RS422 bus transceiving chip ADM485ARZ have RO terminal,
RE terminal, DE terminal, DI terminal, VCC terminal, A terminal, B terminal and GND terminal；The RO terminal connection resistance R19 and wire jumper
The RXD_B2 terminal of selecting unit；+ 5V_S voltage after the other end connection isolation of the resistance R19；The RE terminal and DE
Terminal is grounded through resistance R28；The DI terminal empties；+ 5V_S voltage after the VCC terminal connection isolation, and through capacitor M13
It is isolated and is grounded；The A terminal and B terminal are the signal input parts of RS422 bus transceiver, connect XMC P16 connector；Institute
State GND terminal ground connection；The A terminal and B terminal are grounded through resistance R34 and resistance R33 respectively.
As shown in fig. 7, the wire jumper selecting unit is made of the contact pin and R67 of 2x4 PIN；The contact pin of the 2x4 PIN
Spacing be 2.54mm；The contact pin by EN# terminal, RXD_A1 terminal, RXD_A2 terminal, RXD_A3 terminal, RXD_B1 terminal,
RXD_B2 terminal, RXD_B3 terminal, GND_S terminal are constituted；The EN terminal is connected on+5V_S power supply through R67 resistance；The EN
Terminal connect with the EN terminal of RS232 bus transceiving chip ADM213EARSZ and-SHDN terminal simultaneously with signal amplifier
The enable end of SN74AHC1G125 connects；The GND_S terminal ground；The RXD_A1 terminal, RXD _ A2 terminal, RXD_A3
It is connect with the VIA terminal of signal isolation chip ADuM3401；The RXD_B1 terminal and RS232 bus transceiving chip
The connection of R4OUT terminal；The RXD_B2 terminal is connect with the RO terminal of RS422 bus transceiving chip；The RXD_B3 terminal with
The RO terminal of RS485 bus transceiving chip connects.
A kind of working method of the multifunctional serial port card based on XMC standard interface, it is characterised in that it the following steps are included:
(1) selection method of RS232 function:
1. when the EN terminal and GND_S terminal that are not shorted CN1, the RS232 bus transceiving chip that is connect in this way with the EN terminal of CN1
The signal that the EN terminal of ADM213EARSZ receives is high level signal, and chip is in running order at this time, ensure that RS232
Data transmitting channel is unimpeded；
2. the signal that the enable end for the signal amplifier SN74AHC1G125 simultaneously, connecting with the EN terminal of CN1 receives
For high level signal, device is in off working state, RS422 and RS485 data transmitting channel is interrupted at this time；
3. not being shorted RXD_A2 terminal and RXD_B2 terminal when the RXD_A1 terminal and RXD_B1 terminal that are shorted CN1, not being shorted
RXD_A3 terminal and RXD_B3 terminal, the VIA terminal and RS232 bus transceiving chip of such signal isolation chip ADuM3401
The R4OUT terminal of ADM213EARSZ has been connected in together, has reached that RS232 serial ports receiving channel is unimpeded while RS422 and RS485
The purpose that data receiving channel interrupts, realizes the selection of RS232 function.
(2) selection method of RS422 function:
1. when the EN terminal and GND_S terminal that are shorted CN1, the signal amplifier being connect in this way with the EN terminal of CN1
The signal that the enable end of SN74AHC1G125 receives be low level signal, device is in running order, ensure that RS422 and
RS485 data transmitting channel is unimpeded.
2. the EN terminal for the RS232 bus transceiving chip ADM213EARSZ simultaneously, connecting with the EN terminal of CN1 connects
The signal received is low level signal, and chip is in off working state at this time.At this point, RS232 data transmit-receive channel is interrupted.
3. it is not shorted RXD_A1 terminal and RXD_B1 terminal when the RXD_A2 terminal and RXD_B2 terminal that are shorted CN1, it is not short
Connect RXD_A3 terminal and RXD_B3 terminal, the VIA terminal and RS422 bus transceiving chip of such signal isolation chip ADuM3401
The RO terminal of ADM213EARSZ has been connected in together, has reached that RS422 serial ports receiving channel is unimpeded while RS485 data receiver is logical
The purpose that road interrupts, realizes the selection of RS422 function.
(3) selection method of RS485 function:
1. when the EN terminal and GND_S terminal that are shorted CN1, the signal amplifier being connect in this way with the EN terminal of CN1
The signal that the enable end of SN74AHC1G125 receives is low level signal, device is in running order ensure that RS422 and
RS485 data transmitting channel is unimpeded.
2. the EN terminal for the RS232 bus transceiving chip ADM213EARSZ simultaneously, connecting with the EN terminal of CN1 connects
The signal received is low level signal, and chip is in off working state at this time.At this point, RS232 data transmit-receive channel is interrupted.
3. not being shorted RXD_A1 terminal and RXD_B1 terminal simultaneously when the RXD_A3 terminal and RXD_B3 terminal that are shorted CN1
It is not shorted RXD_A2 terminal and RXD_B2 terminal, VIA terminal and RS485 the bus transmitting-receiving of such signal isolation chip ADuM3401
The RO terminal of chip ADM213EARSZ has been connected in together, has reached that RS485 serial data receiving channel is unimpeded while RS422 connects
The purpose for receiving channel interrupt, realizes the selection of RS485 function.
In order to realize the present invention technological means, character of innovation, reach purpose and effect is easy to understand, tie below
Conjunction is specifically illustrating, and the present invention is further explained.
Present invention design is a kind of multifunctional serial port card based on XMC standard interface.
As shown in Figure 1, the PCIE bus of outer computer is introduced on serial ports controller by XMC P15 connector.String
Mouth controller is responsible for PCIE general line system being UART bus.UART bus, which passes through again after signal isolation chip is isolated, to be guided to
RS232 bus transceiver, RS422 bus transceiver and RS485 bus transceiver.The standard that bus transceiver converts
RS232 serial ports, RS422 serial ports and RS485 rs 232 serial interface signal are drawn out on external interface by XMC P16 connector, realize number
It is believed that number link control.Outside+5V and+3.3V power supply signal are introduced on isolated from power chip by XMC P15 connector
Carry out isolated from power.Power supply signal after isolation be serial ports controller, RS232 bus transceiver, RS422 bus transceiver and
RS485 bus transceiver provides electric energy.
As shown in Fig. 2, isolated from power chip uses the miniature isolation DC/DC converter DCP010505B of TI company.PIN14
SynIN pin is defined as the voltage+5V before isolated from power, is input on isolated from power chip by XMC P15 connector.PIN6 +
VOUT pin is defined as the voltage+5V_S after isolated from power, which is serial ports controller, signal isolation chip, RS232 bus
Transceiver, RS422 bus transceiver and RS422 bus transceiver provide electric energy.PIN1 VS pin is power input port, is
Chip itself is powered.
As shown in figure 3, rs 232 serial interface signal isolating chip uses the two-channel digital signal isolator ADuM3401 of ADI company.
PIN16 VDD2 pin define be isolation before voltage+5V.PIN11 VID, PIN13 VOB and the definition of PIN14 VOA pin are
UART digital signal (including: UART_RXD, UART_TXD, UART_RTS#) before isolation, this group of digital signal is by serial ports control
Device processed is output on the isolating chip.PIN1 VDD1 pin define be isolation after voltage+5V_S.PIN3 VIA,PIN4 VIB
It is that UART digital signal (includes: UART_S_RXD, UART_S_TXD, UART_S_ after being isolated with the definition of PIN6 VOD pin
RTS#), this group of digital signal is output on RS232, RS422 and RS485 bus transceiver from isolating chip.
Since UART bus can only realize in synchronization a kind of communication of serial port function, so in order to realize three kinds of serial ports
The switching of function selects, which devises serial ports wire jumper selecting unit to control RS232 bus transceiver, RS422 bus
The working condition of transceiver and RS485 bus transceiver, to realize tri- kinds of RS232, RS422 and RS485 different serial port functions
Switching.
Fig. 4 is RS232 bus transceiver peripheral circuit diagram, and bus transceiver selects the ADM213EARSZ of ADI company to produce
Product.PIN24 EN pin is the enable end of the chip, and high level is effective, which has guided to serial ports wire jumper selecting unit.PIN20
T3IN pin receives the UART_S_TXD signal of digital isolating chip output, passes through PIN1 T3OUT pin handle after treatment
232_TX signal is output on XMC P16, thereby realizes the function that RS232 serial ports sends data.PIN23 R4IN pin
The 232_RX signal inputted from XMC P16 connector is received, after treatment by PIN22 R4OUT pin UART_S_
RXD signal guides to serial ports wire jumper selecting unit.Thereby realize the function that RS232 serial ports receives data.
Fig. 5 is the circuit design drawing of the automatic flow control of RS485.RS485 bus transceiver selects ADI company
ADM485ARZ product arranges in pairs or groups U1 digital inverter, U2 signal amplifier by periphery to realize the automatic flow control of RS485 half-duplex
Data processed transmit and receive the function that function and RS422 data are sent.The PIN1 pin of U2 signal amplifier is enable end, low electricity
Flat effective, signal has guided to serial ports wire jumper selecting unit.
Fig. 6 is RS422 data receiver function peripheral circuit.Bus transceiver is also the ADM485ARZ product of ADI company.
PIN6 A pin and PIN7 B pin receive 422_RX+ the and 422_RX- signal of XMC P16 connector input, by processing
422_RXD signal is output at " serial port function selection circuit " by PIN1 RO pin afterwards, realizes RS422 data receiver
Function.
Fig. 7 is serial ports wire jumper selecting unit.Selecting unit is made of the contact pin and R67 of 2x4 PIN
Serial port function choosing principles are as follows:
(1) selection method of RS232 function:
1. when the EN terminal and GND_S terminal that are not shorted CN1, the RS232 bus transceiving chip that is connect in this way with the EN terminal of CN1
The signal that the EN terminal of ADM213EARSZ receives is high level signal, and chip is in running order at this time, ensure that RS232
Data transmitting channel is unimpeded；
2. the signal that the enable end for the signal amplifier SN74AHC1G125 simultaneously, connecting with the EN terminal of CN1 receives
For high level signal, device is in off working state, RS422 and RS485 data transmitting channel is interrupted at this time；
3. not being shorted RXD_A2 terminal and RXD_B2 terminal when the RXD_A1 terminal and RXD_B1 terminal that are shorted CN1, not being shorted
RXD_A3 terminal and RXD_B3 terminal, the VIA terminal and RS232 bus transceiving chip of such signal isolation chip ADuM3401
The R4OUT terminal of ADM213EARSZ has been connected in together, has reached that RS232 serial ports receiving channel is unimpeded while RS422 and RS485
The purpose that data receiving channel interrupts, realizes the selection of RS232 function.
(2) selection method of RS422 function:
1. when the EN terminal and GND_S terminal that are shorted CN1, the signal amplifier being connect in this way with the EN terminal of CN1
The signal that the enable end of SN74AHC1G125 receives be low level signal, device is in running order, ensure that RS422 and
RS485 data transmitting channel is unimpeded.
2. the EN terminal for the RS232 bus transceiving chip ADM213EARSZ simultaneously, connecting with the EN terminal of CN1 connects
The signal received is low level signal, and chip is in off working state at this time.At this point, RS232 data transmit-receive channel is interrupted.
3. it is not shorted RXD_A1 terminal and RXD_B1 terminal when the RXD_A2 terminal and RXD_B2 terminal that are shorted CN1, it is not short
Connect RXD_A3 terminal and RXD_B3 terminal, the VIA terminal and RS422 bus transceiving chip of such signal isolation chip ADuM3401
The RO terminal of ADM213EARSZ has been connected in together, has reached that RS422 serial ports receiving channel is unimpeded while RS485 data receiver is logical
The purpose that road interrupts, realizes the selection of RS422 function.
(3) selection method of RS485 function:
1. when the EN terminal and GND_S terminal that are shorted CN1, the signal amplifier being connect in this way with the EN terminal of CN1
The signal that the enable end of SN74AHC1G125 receives is low level signal, device is in running order ensure that RS422 and
RS485 data transmitting channel is unimpeded.
2. the EN terminal for the RS232 bus transceiving chip ADM213EARSZ simultaneously, connecting with the EN terminal of CN1 connects
The signal received is low level signal, and chip is in off working state at this time.At this point, RS232 data transmit-receive channel is interrupted.
3. not being shorted RXD_A1 terminal and RXD_B1 terminal simultaneously when the RXD_A3 terminal and RXD_B3 terminal that are shorted CN1
It is not shorted RXD_A2 terminal and RXD_B2 terminal, VIA terminal and RS485 the bus transmitting-receiving of such signal isolation chip ADuM3401
The RO terminal of chip ADM213EARSZ has been connected in together, has reached that RS485 serial data receiving channel is unimpeded while RS422 connects
The purpose for receiving channel interrupt, realizes the selection of RS485 function.
Above embodiments are only to the present invention is based on a kind of multifunctional serial port fixture body application examples based on XMC standard interface
Son not, limits the claim of this application.All modifications and non-intrinsically safe carried out in the claim of this application technical solution change
Into, within the claim of this application protection scope.
The present invention does not address place and is suitable for the prior art.
Claims (8)
1. a kind of multifunctional serial port card based on XMC standard interface, it is characterised in that it includes: XMC P15 connector, XMC
P16 connector, serial ports controller, power isolation circuit, signal isolation circuit, wire jumper selecting unit, RS232 bus transceiver,
RS422 bus transceiver, RS485 bus transceiver and standard x MC template backboard；Wherein, the XMC P15 connector, XMC
P16 connector, serial ports controller, power isolation circuit, signal isolation circuit, wire jumper selecting unit, RS232 bus transceiver,
RS422 bus transceiver, RS485 bus transceiver are integrated on standard x MC template backboard；The XMC P15 connector
Input terminal connects external+5V power supply, while receiving external PCIE signal, and output end is connect with power isolation circuit, while with
Serial ports controller is in be bi-directionally connected；It is in be bi-directionally connected between the serial ports controller and signal isolation circuit；The RS232 bus
Transceiver, RS422 bus transceiver and RS485 bus transceiver are single with the output end of signal isolation circuit, wire jumper selection respectively
The input terminal of member unidirectionally connects, and the input terminal with XMC P16 connector is in be bi-directionally connected；The serial ports controller, signal isolation
Circuit, RS232 bus transceiver, RS422 bus transceiver and RS485 bus transceiver through power isolation circuit respectively by being isolated
+ 5V_S power supply power supply afterwards；The output end of the XMC P16 connector exports rs 232 serial interface signal.
2. a kind of multifunctional serial port card based on XMC standard interface according to claim 1, it is characterised in that the power supply every
It from circuit is made of isolated from power chip DCP010505B, resistance R155, resistance R148, capacitor C14 and capacitor M58；It is described
Isolated from power chip DCP010505B has VS terminal, two 0V terminals ,+VOUT terminal, NC terminal, SynIN terminal and the end SynO
Son；The one end the resistance R155 connects external+5V voltage, and one end connects resistance R148；The other end of the resistance R148 is grounded；
The resistance R155 connects SynIN terminal with the intermediate connection point of resistance R148；The NC terminal empties；+ VOUT the terminal
Voltage+5V_S after output isolation；Described two 0V terminals, the earth signal GND before a connection isolation, after one connects isolation
Earth signal GND_S；The capacitor C14 and capacitor M58 are connected in parallel, and one terminates external+5V voltage, other end ground connection；The VS
Terminal is connect with outside+5V power supply.
3. a kind of multifunctional serial port card based on XMC standard interface according to claim 1, it is characterised in that the signal every
It from circuit is made of signal isolation chip ADuM3401, resistance R137, resistance R138；The signal isolation chip ADuM3401
There are VDD1 terminal, VDD2 terminal, two GND1 terminals, two GND2 terminals, VIA terminal, VIB terminal, VIC terminal, the end VID
Son, VOA terminal, VOB terminal, VOC terminal, VOD terminal, VE1 terminal and VE2 terminal；The VE1 terminal is connected with resistance R137
Afterwards with VDD2 terminal access+5V power supply jointly；The VE1 terminal connect with resistance R138 after with VDD1 terminal be commonly connected to+
5V_S voltage；Described two GND1 terminals and two GND2 terminals are grounded respectively；The VIB terminal and VOB terminal empty；It is described
VIC terminal and VOC terminal empty；The VIA terminal simultaneously the RXD_A1 terminal of tie jumper selecting unit, RXD_A2 terminal and
RXD_A3 terminal, VIA terminal receive the UART_S_RXD signal of wire jumper selecting unit output by chip interior logic circuit
From terminal VOA output UART_RXD signal to serial ports controller after isolation, UART_S_RXD signal and UART_ are thereby realized
RXD signal isolation；The VID terminal receive by serial ports controller output UART_TXD signal after by chip interior logic
UART_S_TXD signal is exported to RS232 bus transceiver, RS422 bus transceiver and RS485 from terminal VOD after circuit isolation
Bus transceiver thereby realizes UART_TXD signal and UART_S_TXD signal isolation.
4. a kind of multifunctional serial port card based on XMC standard interface according to claim 1, it is characterised in that the RS232
Bus transceiver be by RS232 bus transceiving chip ADM213EARSZ, capacitor M20, capacitor M16, capacitor M17, capacitor M21 and
Capacitor M25 is constituted；The RS232 bus transceiving chip ADM213EARSZ has C1+ terminal, C1- terminal, C2+ terminal, the end C2-
Son, T1IN terminal, T2IN terminal, T3IN terminal, T4IN terminal, T1OUT terminal, T2OUT terminal, T3OUT terminal, the end T4OUT
Son, R1OUT terminal, R2OUT terminal, R3OUT terminal, R4OUT terminal, R5OUT terminal, R1IN terminal, R2IN terminal, the end R3IN
Son, R4IN terminal, R5IN terminal, EN terminal ,-SHDN terminal, GND terminal, V- terminal, V+ terminal and VCC terminal；The C1+
Connection is isolated through capacitor M20 between terminal and C1- terminal；It is isolated between the C2+ terminal and C2- terminal through capacitor M16 and connects；
The EN terminal and-SHDN terminal are shorted the enabled input terminal as RS232；The T3IN terminal is received by signal isolation core
Piece ADuM3401 VOD terminal output UART_S_TXD signal it is converted after from T3OUT terminal export RX232_TX signal to
XMC X16 connector；The R4IN terminal receive by XMC X16 connector output RS232_RX signal after converted from
R4OUT terminal is output to wire jumper selecting unit RXD_B1 terminal；The T4IN terminal ground；The R1OUT terminal, the end R2OUT
Son, R3OUT terminal, R5OUT terminal, R1IN terminal, R2IN terminal, R3IN terminal, R5IN terminal, T1IN terminal, T2IN terminal,
T1OUT terminal and T2OUT terminal empty.
5. a kind of multifunctional serial port card based on XMC standard interface according to claim 1, it is characterised in that the RS485
Bus transceiver is by RS485 bus transceiving chip ADM485ARZ, digital inverter 74V1G14STR, signal amplifier
SN74AHC1G125, resistance R17, resistance R15, resistance R20, resistance R21, resistance R22 and capacitor M11 are constituted；The number is anti-
The input terminal of phase device 74V1G14STR receives the UART_S_TXD signal after the isolation of signal isolation chip, output end connection signal
The input terminal of amplifier SN74AHC1G125, power end receive the+5V_S voltage after isolation；The signal amplifier
The output end of SN74AHC1G125 connects RS485 bus transceiving chip ADM485ARZ, and power end receives the+5V_S after isolation
Voltage, enable end connect the enable end EN of RS232 bus transceiver；The RS485 bus transceiving chip ADM485ARZ has RO
Terminal, RE terminal, DE terminal, DI terminal, VCC terminal, A terminal, B terminal and GND terminal；The RO terminal connects resistance R20
With wire jumper selecting unit；+ 5V_S voltage after the other end connection isolation of the resistance R20；The RE terminal connects through resistance R15
Ground；The output end of the DE terminal connection signal amplifier SN74AHC1G125；The DI terminal is through resistance R17 and signal isolation
The VOD terminal of chip ADuM3401 connects；+ 5V_S voltage after the VCC terminal connection isolation, and simultaneously through capacitor M11 isolation
Ground connection；The A terminal connects XMC P16 connector with B terminal；The GND terminal ground connection；The A terminal and B terminal pass through respectively
Resistance R22 and resistance R21 ground connection.
6. a kind of multifunctional serial port card based on XMC standard interface according to claim 1, it is characterised in that it is total to state RS422
Line transceiver is by RS422 bus transceiving chip ADM485ARZ, resistance R19, resistance R28, resistance R34, resistance R33 and capacitor
M11 is constituted；The RS422 bus transceiving chip ADM485ARZ has RO terminal, RE terminal, DE terminal, DI terminal, VCC terminal, A
Terminal, B terminal and GND terminal；The RXD_B2 terminal of the connection of RO terminal the resistance R19 and wire jumper selecting unit；The resistance
+ 5V_S voltage after the other end connection isolation of R19；The RE terminal and DE terminal are grounded through resistance R28；The DI terminal is set
It is empty；+ 5V_S voltage after the VCC terminal connection isolation, and be isolated and be grounded through capacitor M13；The A terminal and B terminal are
The signal input part of RS422 bus transceiver connects XMC P16 connector；The GND terminal ground connection；The A terminal and the end B
Son is grounded through resistance R34 and resistance R33 respectively.
7. a kind of multifunctional serial port card based on XMC standard interface according to claim 1, it is characterised in that the wire jumper choosing
Unit is selected to be made of the contact pin and R67 of 2x4 PIN；The spacing of the contact pin of the 2x4 PIN is 2.54mm；The contact pin is by EN#
Terminal, RXD_A1 terminal, RXD_A2 terminal, RXD_A3 terminal, RXD_B1 terminal, RXD_B2 terminal, RXD_B3 terminal, GND_S
Terminal is constituted；The EN terminal is connected on+5V_S power supply through R67 resistance；The EN terminal and RS232 bus transceiving chip
EN terminal and-SHDN the terminal connection of ADM213EARSZ is connect with the enable end of signal amplifier SN74AHC1G125 simultaneously；Institute
State GND_S terminal ground；The RXD_A1 terminal, RXD _ A2 terminal, RXD_A3 are with signal isolation chip ADuM3401's
The connection of VIA terminal；The RXD_B1 terminal is connect with the R4OUT terminal of RS232 bus transceiving chip；The RXD_B2 terminal with
The RO terminal of RS422 bus transceiving chip connects；The RXD_B3 terminal is connect with the RO terminal of RS485 bus transceiving chip.
8. a kind of working method of the multifunctional serial port card based on XMC standard interface, it is characterised in that it the following steps are included:
(1) selection method of RS232 function:
1. when the EN terminal and GND_S terminal that are not shorted CN1, the RS232 bus transceiving chip that is connect in this way with the EN terminal of CN1
The signal that the EN terminal of ADM213EARSZ receives is high level signal, and chip is in running order at this time, ensure that RS232
Data transmitting channel is unimpeded；
2. the signal that the enable end for the signal amplifier SN74AHC1G125 simultaneously, connecting with the EN terminal of CN1 receives
For high level signal, device is in off working state, RS422 and RS485 data transmitting channel is interrupted at this time；
3. not being shorted RXD_A2 terminal and RXD_B2 terminal when the RXD_A1 terminal and RXD_B1 terminal that are shorted CN1, not being shorted
RXD_A3 terminal and RXD_B3 terminal, the VIA terminal and RS232 bus transceiving chip of such signal isolation chip ADuM3401
The R4OUT terminal of ADM213EARSZ has been connected in together, has reached that RS232 serial ports receiving channel is unimpeded while RS422 and RS485
The purpose that data receiving channel interrupts, realizes the selection of RS232 function；
(2) selection method of RS422 function:
1. when the EN terminal and GND_S terminal that are shorted CN1, the signal amplifier being connect in this way with the EN terminal of CN1
The signal that the enable end of SN74AHC1G125 receives be low level signal, device is in running order, ensure that RS422 and
RS485 data transmitting channel is unimpeded；
2. the EN terminal for the RS232 bus transceiving chip ADM213EARSZ simultaneously, connecting with the EN terminal of CN1 receives
Signal be low level signal, chip is in off working state at this time；
At this point, RS232 data transmit-receive channel is interrupted；
3. not being shorted RXD_A1 terminal and RXD_B1 terminal when the RXD_A2 terminal and RXD_B2 terminal that are shorted CN1, not being shorted
RXD_A3 terminal and RXD_B3 terminal, the VIA terminal and RS422 bus transceiving chip of such signal isolation chip ADuM3401
The RO terminal of ADM213EARSZ has been connected in together, has reached that RS422 serial ports receiving channel is unimpeded while RS485 data receiver is logical
The purpose that road interrupts, realizes the selection of RS422 function；
(3) selection method of RS485 function:
1. when the EN terminal and GND_S terminal that are shorted CN1, the signal amplifier being connect in this way with the EN terminal of CN1
The signal that the enable end of SN74AHC1G125 receives is low level signal, device is in running order ensure that RS422 and
RS485 data transmitting channel is unimpeded；
2. the EN terminal for the RS232 bus transceiving chip ADM213EARSZ simultaneously, connecting with the EN terminal of CN1 receives
Signal be low level signal, chip is in off working state at this time；
At this point, RS232 data transmit-receive channel is interrupted；
3. not being shorted RXD_A1 terminal and RXD_B1 terminal while not short when the RXD_A3 terminal and RXD_B3 terminal that are shorted CN1
Connect RXD_A2 terminal and RXD_B2 terminal, the VIA terminal and RS485 bus transceiving chip of such signal isolation chip ADuM3401
The RO terminal of ADM213EARSZ has been connected in together, reached that RS485 serial data receiving channel is unimpeded and meanwhile RS422 receive it is logical
The purpose that road interrupts, realizes the selection of RS485 function.
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| CN201811157771.6A CN109471828A (en) | 2018-09-30 | 2018-09-30 | A kind of multifunctional serial port card and working method based on XMC standard interface |
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| CN201811157771.6A CN109471828A (en) | 2018-09-30 | 2018-09-30 | A kind of multifunctional serial port card and working method based on XMC standard interface |
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