CN208424392U - A kind of the serial ports design circuit and active Ethernet equipment of active Ethernet equipment - Google Patents
A kind of the serial ports design circuit and active Ethernet equipment of active Ethernet equipment Download PDFInfo
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Abstract
A kind of the serial ports design circuit and active Ethernet equipment of active Ethernet equipment, to provide the external interface for realizing serial communication for POE equipment.The serial ports design circuit of POE equipment includes: detection module, and whether first part's data port in Ethernet interface for detecting POE equipment is charged, and output control signal according to testing result；First part's data port is used for transmission serial data when connecting with the Universal Serial Bus UART module in POE equipment, first part's data port is used for transmission power supply signal when connecting with the power module in POE equipment；Switch module is connect with detection module, for being connected first part's data port and UART module or power module switching according to control signal.
Description
Technical field
This application involves ethernet technology field more particularly to a kind of active Ethernet (Power Over Ethernet,
POE) the serial ports design circuit and active Ethernet equipment of equipment.
Background technique
POE is referred in the case where existing Ethernet Cat.5 is routed architecture and does not make any changes, and is being some
While IP-based terminal (such as IP telephone machine, wireless local network connecting point AP, web camera) transmits data-signal, also
The technology of direct current supply can be provided for such equipment.The product powered in this way is referred to as POE equipment.For POE equipment
The equipment of power supply is known as power supply unit (Power Sourcing Equipment, PSE).
In general, the network interface and serial ports framework of POE equipment can be as shown in Figure 1.The RJ45 network interface of POE equipment can transmit
Eight road signals, the data port marked as 1,2,3,6 can be used for receiving the signal of external power supply input, marked as 4,5,7,8
Data port can also be used for receiving the signal of external power supply input.In addition, the data port marked as 1,2,3,6 is also used to transmit
Data-signal.
In POE equipment shown in Fig. 1, Universal Serial Bus (Universal Asynchronous
Receiver/Transmitter, UART) module be POE equipment internal module, that is to say, that POE equipment does not mention externally
For UART interface, thus the serial port function of POE equipment to be used to carry out data transmission, need to disassemble equipment, the process
It operates comparatively laborious, and is not easy to Project Realization.
Therefore, the serial ports design scheme for needing a kind of POE equipment, to provide pair for realizing serial communication for POE equipment
External tapping.
Utility model content
The embodiment of the present application provides the serial ports design circuit and POE equipment of a kind of POE equipment, to provide for POE equipment
Realize the external interface of serial communication.
In a first aspect, the embodiment of the present application provides a kind of serial ports design circuit of active Ethernet POE equipment, the circuit packet
Include: whether detection module, first part's data port in Ethernet interface for detecting POE equipment are charged, and according to inspection
Survey result output control signal；First part's data port is connect with the Universal Serial Bus UART module in POE equipment
When be used for transmission serial data, first part's data port is used for transmission power supply letter when connecting with the power module in POE equipment
Number；Switch module is connect with detection module, for according to control signal by first part's data port and UART module or power supply
Module switching connection.
Optionally, switch module is cutting first part's data port and UART module or power module according to control signal
When changing connection, it is specifically used for: if control signal designation first part data port electrification, by first part's data port and power supply
Module connection；Alternatively, if control signal designation first part data port is not charged, by first part's data port and UART mould
Block connection.
Optionally, when the POE device power, first part's data port is connect with power module.
Optionally, whether first part data port of the detection module in the Ethernet interface of detection POE equipment is charged
When, it is specifically used for: the first data port and use being connect in detection first part's data port for the anode with power module
In the difference in voltage for the second data port that the cathode with power module is connect, with determine first part's data port whether band
Electricity.
Optionally, detection module includes: the first divider resistance, and the first end of the first divider resistance and the first data port connect
It connects；Second divider resistance, the first end of the second divider resistance are connect with the second end of the first divider resistance, the second divider resistance
Second end is connect with the second data port；First metal-oxide-semiconductor, the grid of the first metal-oxide-semiconductor are connect with the first end of the first divider resistance,
The source electrode of first metal-oxide-semiconductor is connect with the second end of the second divider resistance；Optocoupler, the first input end of optocoupler by input resistance with
The connection of first data port, the second input terminal of optocoupler are connect with the drain electrode of the first metal-oxide-semiconductor, the output end and switch module of optocoupler
The output end of connection, optocoupler is connected by the anode of pull-up resistor and pull-up power supply.
Optionally, detection module further include: filter capacitor, the first end of the first end of filter capacitor and the second divider resistance
Connection, the second end of filter capacitor are connect with the second end of the second divider resistance.
Optionally, switch module includes: the second metal-oxide-semiconductor, and the grid of the second metal-oxide-semiconductor is connect with detection circuit, the second metal-oxide-semiconductor
Drain electrode connect with the source electrode of the second metal-oxide-semiconductor by first capacitor, the source electrode of the second metal-oxide-semiconductor is grounded；First relay, first after
Electric appliance is connect with the drain electrode of the second metal-oxide-semiconductor, for according to the output signal of the second metal-oxide-semiconductor by first part's data port and UART
Module or power module switching connection.
Second aspect, the embodiment of the present application provide a kind of serial ports design circuit of active Ethernet POE equipment, the circuit packet
Include: first network interface, first network interface are docked with the Ethernet interface in POE equipment, first in Ethernet interface
Subnetwork interface is used for transmission serial data, the second part network interface in Ethernet interface be used for transmission Ethernet data or
It is used for transmission power supply signal；RS232 transceiver, for being converted to the serial data transmitted in first part's data port
Serial data under RS232 agreement；RS232 interface is connect with the output end of RS232 transceiver, for will be under RS232 agreement
Serial data output；Second network interface connect with first network interface, for will be transmitted in second part data port with
Too network data or power supply signal output.
The third aspect, the embodiment of the present application provide a kind of POE equipment, which includes above-mentioned first aspect and its appoint
The serial ports of the POE equipment provided in one optional implementation designs circuit.
To sum up, circuit is designed using the serial ports of POE equipment provided by the present application, since switch module can be by first part
Data port is connect with UART module or power module switching connection, then, when first part's data port and UART module connect
When connecing, first part's data port in POE equipment is the external interface that can be considered in POE equipment for realizing serial communication.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram for POE equipment that the prior art provides；
Fig. 2 is that the serial ports of the first POE equipment provided by the embodiments of the present application designs the structural schematic diagram of circuit；
Fig. 3 is a kind of structural schematic diagram of POE equipment provided by the embodiments of the present application；
Fig. 4 is a kind of operational flow diagram of detection module and switch module provided by the embodiments of the present application；
Fig. 5 is a kind of structural schematic diagram of detection module provided by the embodiments of the present application；
Fig. 6 is a kind of structural schematic diagram of detection module and switch module provided by the embodiments of the present application；
Fig. 7 is that the serial ports of second of POE equipment provided by the embodiments of the present application designs the structural schematic diagram of circuit；
Fig. 8 is that a kind of serial ports of POE equipment provided by the embodiments of the present application designs the connection signal of circuit and POE equipment
Figure；
Fig. 9 is that the serial ports of the third POE equipment provided by the embodiments of the present application designs the structural schematic diagram of circuit.
Specific embodiment
The embodiment of the present application provides a kind of serial ports design circuit of POE equipment, realizes that serial ports is logical to provide for POE equipment
The external interface of letter.
It describes in detail with reference to the accompanying drawing to serial ports design scheme provided by the embodiments of the present application.
It is referring to fig. 2 a kind of serial ports design circuit of active Ethernet POE equipment provided by the embodiments of the present application.The circuit
200 include detection module 201 and switch module 202.
Whether detection module 201, first part's data port in Ethernet interface for detecting POE equipment are charged,
And output controls signal according to testing result；For passing when first part's data port is connect with the UART module in POE equipment
Defeated serial data, first part's data port are used for transmission power supply signal when connecting with the power module in POE equipment；
Switch module 202 is connect with detection module 201, for according to control signal by first part's data port with
UART module or power module switching connection.
Wherein, the Ethernet interface of POE equipment can be RJ45 network interface；First part's data port can be POE
The port of serial ports can be multiplexed in the Ethernet interface of equipment.Illustratively, first part's data port can be POE equipment
In data port marked as 4,5,7,8.This is because the data port in POE equipment marked as 1,2,3,6 has been used to together
When transmission data-signal and power supply signal, multiplexing difficulty is larger.
Wherein, the switch in switch module 202 for switching can be two single-pole double-throw switch (SPDT)s.It is single when specific implementation
Double-pole double throw switch can be realized using relay.
Using the above scheme, since first part's data port can be connect by switch module 202 with UART module or electricity
Source module switching connection, then, first part's number when first part's data port is connect with UART module, in POE equipment
It is the external interface that can be considered in POE equipment for realizing serial communication according to port.
Specifically, it when the serial ports of above-mentioned POE equipment design circuit being applied to POE equipment shown in FIG. 1, the POE and sets
It is standby can be as shown in Figure 3.
In Fig. 3, the input signal of detection module can be the signal of the data port transmission marked as 4,5,7,8, detection
Whether module 201 can be charged in the data port marked as 4,5,7,8 by 4,5,7,8 data port and UART by detecting
Module or the connection of the end PD.Wherein, it is connect with the end PD that is, being connect with power module.
Optionally, switch module 202 according to control signal by first part's data port and UART module or power supply mould
Block switching connection when, be specifically used for: if control signal designation first part data port electrification, by first part's data port with
Power module connection；Alternatively, if control signal designation first part data port it is not charged, by first part's data port with
The connection of UART module.
If control signal designation first part's data port electrification that detection module 201 exports, first part's data terminal
Power supply signal is being transmitted in mouthful, to power to POE equipment.So, it can preferentially power at this time to POE equipment, switch module 202
First part's data port can be connect with power module, be powered to POE equipment.If the control signal that detection module 201 exports
It indicates that first part's data port is not charged, then shows that first part's data port is not powered to POE equipment, at this time switching molding
First part's data port can be connect by block 202 with UART module, to pass through external interface (i.e. first of POE equipment
Divided data port) realize serial communication.
In addition, switch module 202, which can be defaulted, connects first part's data port and power module in POE device power
It connects.
Using this scheme, can preferential pillow POE equipment power supply, avoid occupying first part's number when POE is powered on
Serial communication is carried out according to port, causes the power supply of POE equipment not can guarantee, influences the normal operation of POE equipment.
Illustratively, the operational flow diagram of detection module and switch module can be as shown in Figure 4.In Fig. 4, in POE equipment
When electric, 4578 lines are connected to power module, preferentially power to POE equipment.Whether detection module detects has electricity (to detect on 4578 lines
Whether first part's data port is charged).If being charged on 4578 lines, judges that POE equipment is powered by 4578 lines, switch at this time
Module is failure to actuate, i.e. 4578 lines are still used to power to POE equipment；If not charged on 4578 lines, the 4578 lines free time is judged, at this time
4578 lines can be gone to UART module by switch module, with transmitting serial port data.
Optionally, detection module 201 detection POE equipment Ethernet interface in first part's data port whether band
When electric, be specifically used for: in detection first part's data port for the first data port for connecting of anode of power module and
For the difference in voltage for the second data port that the cathode with power module is connect, with determine first part's data port whether band
Electricity.
When being that POE equipment is powered by first part's data port, port number that first part's data port includes
It can be four, two of them port is used to connect the anode of power module, other two port for connecting power module
Cathode.Specifically, a positive port and a cathode port are used for transmission a pair of of isolated power supply signal.In detection first part
When whether data port is charged, can detect for the first data port for connect of anode of power module and be used for and power supply mould
The difference in voltage of second data port of the cathode connection of block: if the two voltage difference is zero, then it represents that first part's data port
It is not charged；If the two voltage difference is not zero, then it represents that the electrification of first part's data port.
It should be noted that PSE before to the power supply of POE equipment, can carry out PD detection to POE equipment, therefore examined in design
When slowdown monitoring circuit 201, it should be noted that two problems: first is that PD detection process cannot be influenced, the other is the power supply and system of PSE power supply
Power supply is isolation.
To solve the above problems, introducing the process of PD detection first.PD detection purpose be PSE confirmation under hang it is standby
Whether it is an effective power receiving equipment, while confirms the level of power consumption of the equipment.Before power-up, PSE first uses 2.8V~10V
Detecting voltage go whether detecting has the access of POE equipment, whether hang under being confirmed by the characteristic impedance measured standby is effective
POE equipment.The resistance of a 23.7K~26.3K is presented in feeder ear for one effective POE equipment, and shunt capacitance exists
Between 0.05uF~0.12uF.After having detected, PSE hangs the standby voltage for applying a 15.5V~20.5V still further below to measure
The current levels of the equipment.After completing the above process, hanging under PSE confirmation standby is legal POE equipment, and completes to set this
Standby classification, PSE start to be powered the POE equipment, export the voltage of a 44V~57V.
Can be seen that the voltage that PSE powers from above-mentioned detection process is not to settle at one go, but slowly go up
's.Therefore detection circuit provided by the present application, it may be considered that following design concept: during PSE carries out PD detection, detection
Circuit 201 does not work, and when PSE normally starts to power to POE equipment, detection circuit 201 just starts to detect.
Specifically, detection module 201 may include: the first divider resistance, the first end of the first divider resistance and the first number
It is connected according to port；Second divider resistance, the first end of the second divider resistance are connect with the second end of the first divider resistance, and second point
The second end of piezoresistance is connect with the second data port；The of first metal-oxide-semiconductor, the grid of the first metal-oxide-semiconductor and the first divider resistance
One end connection, the source electrode of the first metal-oxide-semiconductor are connect with the second end of the second divider resistance；The first input end of optocoupler, optocoupler passes through
Input resistance is connect with the first data port, and the second input terminal of optocoupler is connect with the drain electrode of the first metal-oxide-semiconductor, the output end of optocoupler
It is connect with switch module 202, the output end of optocoupler is connected by the anode of pull-up resistor and pull-up power supply.
In addition, detection module 201 can also include: filter capacitor, the first end of filter capacitor and the second divider resistance
First end connection, the second end of filter capacitor are connect with the second end of the second divider resistance.
In the application, it can be set by the resistance value to two divider resistances (the first divider resistance and the second divider resistance)
Set, realize following process: when the output voltage of PSE is the small voltage value exported in PD detection process, the first metal-oxide-semiconductor is not opened
It opens, detection circuit 201 does not work at this time；When the output voltage of PSE is normal supply voltage, the first metal-oxide-semiconductor is opened, and is examined at this time
Slowdown monitoring circuit 201 starts to detect.Specifically, it can be carried out by voltage difference of the optocoupler to the first data port and the second data port
Detection.
In addition, in the application, the second data port for being connect in first part's data port with the cathode of power module with
The ground terminal of optocoupler not altogether so that the power supply of PSE power supply is isolated with system power supply.
Illustratively, a kind of possible structural schematic diagram of detection module 201 can be as shown in Figure 5.In Fig. 5 ,+48_IN2
For a specific example of the first data port, GND2_POE is a specific example of the second data port, and R1 is first point
One example of piezoresistance, R2 are an example of the second divider resistance, and the parallel resistance of R3 and R12 are one of input resistance
Specific example, C1 are a specific example of filter capacitor, and M1 is a specific example of the first metal-oxide-semiconductor, and U1 is the one of optocoupler
A specific example, R4 are a specific example of pull-up resistor, and pull-up power supply provides the upper pull-up voltage of 3.3V for optocoupler U1.This
Outside, the ground terminal of optocoupler is isolated with GND2_POE, so that the power supply of PSE power supply is isolated with system power supply.
The working principle of detection module 201 shown in fig. 5 is as follows:
(1) two big resistance of connecting between+48_IN2 and GND2_POE is divided, and (R1 and R2, R1 and R2 can bases
Actual conditions modify resistance value), capacitor C1 is used to absorb the high-frequency noise interference being likely to occur, and accesses pressure controller part after the two partial pressure
(NMOS tube M1), the cut-in voltage of M1 are Vth.In PD detection process, due to PSE maximum output voltage 20V or so, pass through R1
It is resistance value setting with R2, the voltage being divided on M1 can be made to be less than Vth, be not enough to open M1, M1 is off shape at this time
State.Only when PSE normal power supply, the grid voltage of M1 is greater than Vth, and M1 is just begun to turn on, and detection module 201 is started to work.
Therefore, using detection circuit 201 shown in fig. 5, detection circuit will not detect PD and impact.
(2) because+48_IN2 and GND2_POE is a pair of of isolated power supply signal, optocoupler (U1) can be selected to realize this
Detection to isolation signals.Two signals (are allowed for into the function of resistance by resistance R3 and R12 with two resistor coupled in parallel herein
Consumption requires, and can be modified according to practical debugging, a resistance can also be used and realize) access optocoupler U1 input terminal 1.POE equipment
After powering on, input voltage can generate electric current in the input terminal 1 of optocoupler U1, optocoupler output uses OPEN in 48V or so
The connection type of DRAIN is exported, and output end exports DET_CTRL (i.e. control signal), with control switch module 202.
(3) when no-voltage on+48_IN2 and GND2_POE, M1 and U1 are turned off, and DET_CTRL is high level.As+48_
When having POE voltage on IN2 and GND2_POE, M1 and U1 conducting, DET_CTRL is low level.Therefore, 202 basis of switch module
The level state of DET_CTRL can determine whether+48_IN2 and GND2_POE charges.
Optionally, switch module includes: the second metal-oxide-semiconductor, and the grid of the second metal-oxide-semiconductor is connect with detection circuit, the second metal-oxide-semiconductor
Drain electrode connect with the source electrode of the second metal-oxide-semiconductor by first capacitor, the source electrode of the second metal-oxide-semiconductor is grounded；First relay, first after
Electric appliance is connect with the drain electrode of the second metal-oxide-semiconductor, for according to the output signal of the second metal-oxide-semiconductor by first part's data port and UART
Module or power module switching connection.
In addition, switch module can also pass through two metal-oxide-semiconductors (such as MOS1 and MOS2) and two relays (such as JK1
And JK2) realize, the combination of MOS1+JK1 for by a part of data port in first part's data port (such as marked as 4
With 5 data port) connect with UART module or power module switching, the combination of MOS2+JK2 is for by first part's data terminal
Another part data port (such as data port marked as 7 and 8) and UART module or power module switching in mouthful connect.
Its specific connection type is similar with using the scheme of+one relay of a metal-oxide-semiconductor with realization principle, and details are not described herein again.
Illustratively, the detection when detection module 201 uses the implementation in Fig. 5, in switch module 202 and Fig. 5
Module 201 is wanted to cooperate, and first part's data port may be implemented and be used for transmission power supply signal or transmitting serial port data, such as Fig. 6 institute
Show.
In Fig. 6, switch module, work are realized by two metal-oxide-semiconductors (M2 and M3) and two relays (JK1 and JK2)
It is as follows to make principle: when no-voltage on+48_IN2 and GND2_POE, M1 and U1 are turned off, and DET_CTRL is high level, M2 and M3
Conducting, 4578 are confirmed as idle line, and 4578 lines are connected to UART module by relay JK1 and JK2 switching.As+48_IN2 and
When having POE voltage on GND2_POE, M1 and U1 conducting, DET_CTRL export low level, M2 and M3 shutdown, and 4578 are confirmed as power supply
Line, relay JK1 and JK2 do not switch, and maintain default conditions, power for POE equipment.
To sum up, circuit is designed using the serial ports of POE equipment shown in Fig. 2, since switch module 202 can be by first part
Data port is connect with UART module or power module switching connection, then, when first part's data port and UART module connect
When connecing, first part's data port in POE equipment is the external interface that can be considered in POE equipment for realizing serial communication.
In addition, the embodiment of the present application also provides a kind of POE equipment, which includes the string of POE equipment shown in Fig. 2
Mouth design circuit.
In addition, the application also provides the serial ports design circuit of another kind POE equipment, to provide realization string for POE equipment
The external interface of port communications.As shown in fig. 7, the serial ports design circuit 700 of the POE equipment includes:
First network interface 701, first network interface 701 are docked with the Ethernet interface in POE equipment, Ethernet interface
In first part's network interface be used for transmission serial data, the second part network interface in Ethernet interface be used for transmission with
Too network data or power supply signal；
RS232 transceiver 702, for the serial data transmitted in first part's data port to be converted to RS232 agreement
Under serial data；
RS232 interface 703 is connect with the output end of RS232 transceiver 702, for by the serial data under RS232 agreement
Output；
Second network interface 704, connect with first network interface 701, for will transmit in second part data port
Ethernet data or power supply signal output.
Wherein, the serial ports design circuit 700 of the POE equipment can be considered the interface board circuit of POE device external, and POE is set
It, can be as shown in Figure 8 when standby serial ports design circuit 700 is applied to POE equipment shown in FIG. 1.
In the serial ports design circuit 700 of POE equipment, unlike the serial ports of POE equipment design circuit 200, first
Partial data port (such as marked as 4,5,7,8, data port) is only used for transmitting serial port data, second part data port
Be used for transmission Ethernet data and power supply signal, that is to say, that 4,5,7,8, data port be no longer used to give POE equipment supply
Electricity.So, in the serial ports design circuit 700 of POE equipment, first part's data port and second part data port are separated
It comes, thus after independent first part's data port is carried out RS232 conversion, dedicated for transmitting serial port data.
Illustratively, a kind of possible implementation of the serial ports design circuit 700 of POE equipment can be as shown in Figure 9.Figure
In 9, J2 is a specific example of first network interface, and J1 is a specific example of RS2323 interface, and J4 is the second network
One specific example of interface.
The serial ports of POE equipment shown in Fig. 9 designs in circuit, the RJ45 network interface of J2 connection POE equipment, and 1236 lines are straight
It connects and is connect with J1, as the transmission of Ethernet data/power supply signal.4578 lines of J2 are connected to RS232 transceiver U3, output
RS232_RXD and RS232_TXD signal can directly connect PC machine or POE interchanger to the RS232 interface (J4) of 9pin.
It should be noted that, in order to which expression way simplifies, will not in the serial ports design circuit of POE equipment shown in Fig. 9
J2, J1, U3, J4 are connected with signal wire, but the table for replacing signal wire to connect with the signal name in different components pin
It reaches.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Obviously, those skilled in the art can carry out various modification and variations without departing from this Shen to the embodiment of the present application
Please embodiment spirit and scope.In this way, if these modifications and variations of the embodiment of the present application belong to the claim of this application
And its within the scope of equivalent technologies, then the application is also intended to include these modifications and variations.
Claims (9)
1. a kind of serial ports of active Ethernet equipment designs circuit characterized by comprising
Detection module, first part's data port in Ethernet interface for detecting the active Ethernet POE equipment are
No electrification, and output control signal according to testing result；General string in first part's data port and the POE equipment
Row data/address bus UART module is used for transmission serial data when connecting, in first part's data port and the POE equipment
Power module connection when be used for transmission power supply signal；
Switch module is connect with the detection module, for according to the control signal by first part's data port and
UART module or power module switching connection.
2. circuit as described in claim 1, which is characterized in that the switch module according to the control signal by described
When a part of data port and UART module or power module switching connect, it is specifically used for:
If first part's data port described in the control signal designation is charged, by first part's data port and the electricity
Source module connection；Alternatively,
If first part's data port described in the control signal designation is not charged, by first part's data port with it is described
The connection of UART module.
3. circuit as claimed in claim 1 or 2, which is characterized in that when the POE device power, first part's data
Port is connect with the power module.
4. circuit as claimed in claim 1 or 2, which is characterized in that the detection module is in the ether for detecting the POE equipment
When whether first part's data port in network interface is charged, it is specifically used for:
In detection first part's data port for the first data port for connect of anode of the power module and be used for
The power module cathode connection the second data port difference in voltage, with determination first part's data port whether
Electrification.
5. circuit as claimed in claim 4, which is characterized in that the detection module includes:
First divider resistance, the first end of first divider resistance are connect with first data port；
Second divider resistance, the first end of second divider resistance is connect with the second end of first divider resistance, described
The second end of second divider resistance is connect with second data port；
First metal-oxide-semiconductor, the grid of first metal-oxide-semiconductor are connect with the first end of first divider resistance, first metal-oxide-semiconductor
Source electrode connect with the second end of second divider resistance；
Optocoupler, the first input end of the optocoupler are connect by input resistance with first data port, and the of the optocoupler
Two input terminals are connect with the drain electrode of first metal-oxide-semiconductor, and the output end of the optocoupler is connect with the switch module, the optocoupler
Output end connected by the anode of pull-up resistor and pull-up power supply.
6. circuit as claimed in claim 5, which is characterized in that the detection module further include:
Filter capacitor, the first end of the filter capacitor are connect with the first end of second divider resistance, the filter capacitor
Second end connect with the second end of second divider resistance.
7. circuit as claimed in claim 1 or 2, which is characterized in that the switch module includes:
The grid of second metal-oxide-semiconductor, second metal-oxide-semiconductor is connect with the detection module, and the drain electrode of second metal-oxide-semiconductor passes through the
One capacitor is connect with the source electrode of second metal-oxide-semiconductor, the source electrode ground connection of the second metal-oxide-semiconductor；
First relay, first relay are connect with the drain electrode of second metal-oxide-semiconductor, for according to second metal-oxide-semiconductor
Output signal first part's data port and UART module or power module switching are connected.
8. a kind of serial ports of active Ethernet equipment designs circuit characterized by comprising
First network interface, the first network interface are docked with the Ethernet interface in the active Ethernet POE equipment, institute
It states first part's network interface in Ethernet interface and is used for transmission serial data, the second part net in the Ethernet interface
Network interface is used for transmission Ethernet data or power supply signal；
RS232 transceiver, for being converted to the serial data transmitted in first part's data port under RS232 agreement
Serial data；
RS232 interface is connect with the output end of the RS232 transceiver, for exporting the serial data under RS232 agreement；
Second network interface connect with the first network interface, for will be transmitted in the second part data port with
Too network data or power supply signal output.
9. a kind of active Ethernet equipment characterized by comprising circuit as described in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820668798.0U CN208424392U (en) | 2018-05-07 | 2018-05-07 | A kind of the serial ports design circuit and active Ethernet equipment of active Ethernet equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820668798.0U CN208424392U (en) | 2018-05-07 | 2018-05-07 | A kind of the serial ports design circuit and active Ethernet equipment of active Ethernet equipment |
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| Publication Number | Publication Date |
|---|---|
| CN208424392U true CN208424392U (en) | 2019-01-22 |
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|---|---|---|---|
| CN201820668798.0U Expired - Fee Related CN208424392U (en) | 2018-05-07 | 2018-05-07 | A kind of the serial ports design circuit and active Ethernet equipment of active Ethernet equipment |
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| CN (1) | CN208424392U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110266503A (en) * | 2019-06-29 | 2019-09-20 | 宁波瑞辉智能科技有限公司 | A kind of embedded industrial control terminal of double network interfaces for supporting POE to power |
| WO2021129545A1 (en) * | 2019-12-28 | 2021-07-01 | 华为技术有限公司 | Band filter detection apparatus, power sourcing equipment and system |
| CN114268510A (en) * | 2021-12-23 | 2022-04-01 | 安徽皖通邮电股份有限公司 | Remote control switch with network forwarding function and control method |
-
2018
- 2018-05-07 CN CN201820668798.0U patent/CN208424392U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110266503A (en) * | 2019-06-29 | 2019-09-20 | 宁波瑞辉智能科技有限公司 | A kind of embedded industrial control terminal of double network interfaces for supporting POE to power |
| WO2021129545A1 (en) * | 2019-12-28 | 2021-07-01 | 华为技术有限公司 | Band filter detection apparatus, power sourcing equipment and system |
| CN114268510A (en) * | 2021-12-23 | 2022-04-01 | 安徽皖通邮电股份有限公司 | Remote control switch with network forwarding function and control method |
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