CN206595981U - RS485CAN differential signals turn single-ended signal module - Google Patents
RS485CAN differential signals turn single-ended signal module Download PDFInfo
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- CN206595981U CN206595981U CN201720356817.1U CN201720356817U CN206595981U CN 206595981 U CN206595981 U CN 206595981U CN 201720356817 U CN201720356817 U CN 201720356817U CN 206595981 U CN206595981 U CN 206595981U
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Abstract
The utility model provides a kind of RS485CAN differential signals and turns single-ended signal module, including RS485 differential signal inputs, RS485 signaling conversion circuits, RS485 single-ended signals lead-out terminal 485 OUT, CAN differential signal input, CAN signal change-over circuit and CAN single-ended signal lead-out terminal CAN OUT；The RS485 signaling conversion circuits include piezo-resistance R3, bi-directional voltage clamper type Transient Suppression Diode T1, bi-directional voltage clamper type Transient Suppression Diode T2, terminal resistance R2, SN75176 chip U1, build-out resistor R1 and decoupling capacitance C1；The CAN signal change-over circuit includes piezo-resistance R6, bi-directional voltage clamper type Transient Suppression Diode T3, bi-directional voltage clamper type Transient Suppression Diode T4, terminal resistance R5, SN65HVD1050 chip U2, build-out resistor R4 and decoupling capacitance C2.RS485, CAN differential signal are converted into the signal of Single-end output by the utility model, facilitate the measurement of logic analyser, improve the stability of single-ended measurement.
Description
Technical field
The utility model is related to a kind of interconnecting module of logic analyser, and more particularly to one kind provides for logic analyser
The interconnecting module of RS485/CAN signal measurement abilities.
Background technology
Logic analyser is a kind of instrument dedicated for gathering and analyzing data signal, and it can be with certain frequency pair
Measured signal is sampled, and is then converted into logical zero or logical one according to the level value of sampled point, then these are connected
Continuous " 0/1 " is linked to be digital waveform, and can be made and further analyzing according to waveform, to help technical staff to pinpoint the problems,
Record data, critique system etc..RS485, CAN are two kinds of applications very universal communication standards, and it uses differential signal,
And logic analyser can only measure single-ended signal, so some problems occur when this kind of differential signal is analyzed in measurement.
In the prior art, logic analyser measurement RS485, CAN mode have two kinds：
Mode one：Systematically, Measurement channel meets the one of differential signal outputs to the ground wire reception measurement equipment of logic analyser
End, its shortcoming one be because not altogether the reason for cause measurement it is unstable, two be possible be because differential signal amplitude is too small and reaches
Less than the threshold range of logic analyser, cause signal measurement mistake.
Mode two：One end of differential signal is connected to the GND passages of logic analyser, other end connection Measurement channel lacks
Point is if while can be because ground connection disorder causes system work abnormal when also needing to other signals on measurement Target Board.
Therefore, how RS485, CAN differential signal are changed into the letter of the Single-end output of convenient use logic analyser measurement
Number, just into the problem of worth solution.
The content of the invention
In order to solve the above problems, the utility model proposes the skill that a kind of RS485CAN differential signals turn single-ended signal module
Art scheme, and be achieved through the following technical solutions.
The utility model provides a kind of RS485CAN differential signals and turns single-ended signal module, including RS485 differential signals are defeated
Enter terminal, RS485 signaling conversion circuits, RS485 single-ended signal lead-out terminal 485-OUT, CAN differential signal input, CAN
Signaling conversion circuit and CAN single-ended signal lead-out terminals CAN-OUT；The RS485 differential signal inputs attached bag includes 485-
A-IN ports and 485-B-IN ports；The RS485 signaling conversion circuits include piezo-resistance R3, bi-directional voltage clamper type transient state
Suppress diode T1, bi-directional voltage clamper type Transient Suppression Diode T2, terminal resistance R2, SN75176 chip U1, build-out resistor
R1 and decoupling capacitance C1；The 485-A-IN ports, one end of the T1, one end of the R2, one end of the R3, with
It is the 485-B-IN ports, one end of the T2, the other end of the R2, described and the 6th pin A of the U1 links together
The R3 other end and the U1 the 7th pin B link together, described T1, T2 other end ground connection, the 1st pin RO of the U1
One end of the R1 is connected, the other end of the R1 connects the RS485 single-ended signals lead-out terminal 485-OUT, the U1's
4th pin DI connections power supply VCC, the U1 the 2nd pin RE#, the 3rd pin DE is grounded, and the 8th pin VCC of the U1 is described in connection
The 5th pin GND that power supply VCC, the U1 are connected while C1 one end is grounded while the other end of the C1 is connected；It is described
CAN differential signal input attached bags include CAN-H-IN ports and CAN-L-IN ports；The CAN signal change-over circuit includes pressure-sensitive
Resistance R6, bi-directional voltage clamper type Transient Suppression Diode T3, bi-directional voltage clamper type Transient Suppression Diode T4, terminal resistance
R5, SN65HVD1050 chip U2, build-out resistor R4 and decoupling capacitance C2；The CAN-H-IN ports, one end of the T3,
The 7th pin CANH of one end of the R6, one end of the R5 and the U2 links together, the CAN-L-IN ports, institute
The 6th pin CANL for stating T4 one end, the other end of the R6, the other end of the R5 and the U2 links together, described
T3, T4 other end are grounded, the 4th pin RXD connections R4 of U2 one end, and the other end connection of the R4 is described
CAN single-ended signal lead-out terminals CAN-OUT, the U2 the 1st pin TXD, the 3rd pin VDD and the decoupling capacitance of the U2
C2 one end is all connected with power supply VCC, the U2 the 2nd pin VSS, the other end of the decoupling capacitance C2 and is grounded, the U2's
8th pin Rs connection power supplys VCC.
The differential signal output interface of RS485 examining systems is connected to RS485 differential signals described in the utility model defeated
Enter terminal, RS485 differential signals enter RS485 signaling conversion circuits by 485-A-IN ports, 485-B-IN ports；In view of line
May there are instant cut-off and the moment caused high pressure of upper electricity or the wave that there is the generations such as thunderbolt because circuit is longer in road
Gush, if the change-over circuit of rear class may will be damaged without protection circuit, therefore by piezo-resistance R3, bi-directional voltage clamper type
Protection circuit of the Transient Suppression Diode T1 and bi-directional voltage clamper type Transient Suppression Diode T2 compositions to late-class circuit；
RS485 differential signals enter SN75176 chip U1 afterwards, and the chip can be converted into RS485 differential signals in the single-ended letters of RS485
Number, after build-out resistor R1 of the RS485 single-ended signals by series connection after converting, by RS485 single-ended signal lead-out terminals
485-OUT is exported, and the RS485 single-ended signals of output are directly connected to the Measurement channel of logic analyser, and RS485 differential signals turn single
End signal is completed.
The differential signal output interface of CAN examining systems is connected to CAN differential signal inputs described in the utility model
Son, CAN differential signals enter CAN signal change-over circuit by CAN-H-IN ports, CAN-L-IN ports, piezo-resistance R6, two-way
Voltage clamp bit-type Transient Suppression Diode T3 and bi-directional voltage clamper type Transient Suppression Diode T4 compositions are to late-class circuit
Protection circuit；CAN differential signals enter SN65HVD1050 chip U2 afterwards, and the chip can be converted into CAN differential signals
CAN single-ended signals, CAN differential signals change into CAN single-ended signals after CAN signal change-over circuit, and the CAN after converting is mono-
End signal is exported, the CAN single-ended signals of output after series matching resistor R4 by CAN single-ended signal lead-out terminals CAN-OUT
The Measurement channel of logic analyser is directly connected to, CAN differential signals turn single-ended signal completion.
Build-out resistor R1, R4 can reduce the reflection and concussion of signal, it is ensured that the quality of signal transmission, and its resistance is preferably
22 Europe.
C1, C2 are power supply decoupling capacitance, and its resistance is preferably 0.1 microfarad.
R2, R5 are respectively the terminal resistance of RS485 signals and CAN signal communicating circuit, terminal resistance can eliminate due to
The signal reflex that transmission line is discontinuous and brings, its resistance size is generally hundreds of ohm to several kilohms, i.e. R2, R5 resistance
It is not less than 100 Europe and no more than 10 kilo-ohms, preferably 240 Europe.
R3, R6 are piezo-resistance, and piezo-resistance is a kind of votage limit type protection device, utilizes the non-linear spy of piezo-resistance
Property, when overvoltage appears in two interpolars of piezo-resistance, piezo-resistance can be by voltage clamping to a relatively-stationary voltage
Value, so as to realize the protection to late-class circuit, described R3, R4 can select 14K420 piezo-resistances of the prior art.
T1, T2, T3, T4 are bi-directional voltage clamper type Transient Suppression Diode（That is TVS）, TVS is the non-thread using device
Property characteristic overvoltage clamper to a relatively low magnitude of voltage is realized into protection to late-class circuit, T1, T2, T3, T4 model can
To select P6KE6.8CA Transient Suppression Diodes of the prior art.
Compared with prior art, the utility model has the advantages that：
RS485CAN differential signals of the present utility model turn single-ended signal module, and RS485, CAN differential signal are converted into
The signal of Single-end output, facilitates the measurement of logic analyser；Piezo-resistance and bi-directional voltage has been used to clamp in circuit simultaneously
Bit-type Transient Suppression Diode is protected to late-class circuit, improves the stability of single-ended measurement.
The utility model can also be improved further by the following technical programs.
It is preferred that, RS485 differential signal inputs, the output of RS485 signaling conversion circuits, RS485 single-ended signals
Terminal 485-OUT, CAN differential signal input, CAN signal change-over circuit and CAN single-ended signal lead-out terminals CAN-
OUT quantity is equal and not less than 1.RS485CAN differential signals of the present utility model turn single-ended signal module and can be used alone,
Also can polylith use simultaneously, when examining system has multichannel RS485, CAN signal, the polylith module can be accessed.
Brief description of the drawings
Fig. 1 turns single-ended signal modular circuit structural representation for a kind of RS485CAN differential signals of embodiment of the utility model
Figure.
Embodiment
The utility model is further detailed with reference to the accompanying drawings and detailed description
Embodiment：
As shown in figure 1, the RS485CAN differential signals of the present embodiment turn single-ended signal module, including RS485 differential signals
Input terminal, RS485 signaling conversion circuits, RS485 single-ended signal lead-out terminal 485-OUT, CAN differential signal input,
CAN signal change-over circuit and CAN single-ended signal lead-out terminals CAN-OUT.
The RS485 differential signal inputs attached bag includes 485-A-IN ports and 485-B-IN ports；The RS485 signals
Change-over circuit includes piezo-resistance R3, bi-directional voltage clamper type Transient Suppression Diode T1, bi-directional voltage clamper type transient state and suppressed
Diode T2, terminal resistance R2, SN75176 chip U1, build-out resistor R1 and decoupling capacitance C1；The 485-A-IN ports,
One end of the T1, one end of the R2, one end of the R3 and the U1 the 6th pin A link together, the 485-
B-IN ports, one end of the T2, the other end of the R2, the other end of the R3 and the U1 the 7th pin B are connected to
Together, described T1, T2 other end ground connection, the 1st pin RO connections R1 of U1 one end, the other end connection of the R1
The RS485 single-ended signals lead-out terminal 485-OUT, the U1 the 4th pin DI connections power supply VCC, the U1 the 2nd pin RE#,
3rd pin DE is grounded, and the 8th pin VCC of the U1 connects power supply VCC, the 5th pin of the U1 while described C1 one end is connected
GND is grounded while the other end of the C1 is connected.
The CAN differential signal inputs attached bag includes CAN-H-IN ports and CAN-L-IN ports；The CAN signal conversion
Circuit includes piezo-resistance R6, bi-directional voltage clamper type Transient Suppression Diode T3, bi-directional voltage clamper type transient state and suppresses two poles
Pipe T4, terminal resistance R5, SN65HVD1050 chip U2, build-out resistor R4 and decoupling capacitance C2；The CAN-H-IN ports,
One end of the T3, one end of the R6, one end of the R5 and the U2 the 7th pin CANH link together, described
CAN-L-IN ports, one end of the T4, the other end of the R6, the other end of the R5 and the U2 the 6th pin CANL
Link together, described T3, T4 other end are grounded, the 4th pin RXD connections R4 of U2 one end, the R4's
The other end connects the CAN single-ended signals lead-out terminal CAN-OUT, the 1st pin TXD of the U2, the 3rd pin VDD of the U2, with
And one end of the decoupling capacitance C2 be all connected with power supply VCC, the U2 the 2nd pin VSS, the decoupling capacitance C2 the other end it is equal
Ground connection, the 8th pin Rs connection power supplys VCC of the U2.
The differential signal output interface of RS485 examining systems is connected to RS485 differential signals described in the utility model defeated
Enter terminal, RS485 differential signals enter RS485 signaling conversion circuits by 485-A-IN ports, 485-B-IN ports；In view of line
May there are instant cut-off and the moment caused high pressure of upper electricity or the wave that there is the generations such as thunderbolt because circuit is longer in road
Gush, if the change-over circuit of rear class may will be damaged without protection circuit, therefore by piezo-resistance R3, bi-directional voltage clamper type
Protection circuit of the Transient Suppression Diode T1 and bi-directional voltage clamper type Transient Suppression Diode T2 compositions to late-class circuit；
RS485 differential signals enter SN75176 chip U1 afterwards, and the chip can be converted into RS485 differential signals in the single-ended letters of RS485
Number, after build-out resistor R1 of the RS485 single-ended signals by series connection after converting, by RS485 single-ended signal lead-out terminals
485-OUT is exported, and the RS485 single-ended signals of output are directly connected to the Measurement channel of logic analyser, and RS485 differential signals turn single
End signal is completed.
The differential signal output interface of CAN examining systems is connected to CAN differential signal inputs described in the utility model
Son, CAN differential signals enter CAN signal change-over circuit by CAN-H-IN ports, CAN-L-IN ports, piezo-resistance R6, two-way
Voltage clamp bit-type Transient Suppression Diode T3 and bi-directional voltage clamper type Transient Suppression Diode T4 compositions are to late-class circuit
Protection circuit；CAN differential signals enter SN65HVD1050 chip U2 afterwards, and the chip can be converted into CAN differential signals
CAN single-ended signals, CAN differential signals change into CAN single-ended signals after CAN signal change-over circuit, and the CAN after converting is mono-
End signal is exported, the CAN single-ended signals of output after series matching resistor R4 by CAN single-ended signal lead-out terminals CAN-OUT
The Measurement channel of logic analyser is directly connected to, CAN differential signals turn single-ended signal completion.
The resistance of build-out resistor R1, R4 is 22 Europe, and R2, R5 resistance are 240 Europe.R3, R4 are of the prior art
14K420 piezo-resistances.Decoupling capacitance C1, C2 capacitance are 0.1 microfarad.T1, T2, T3, T4 are of the prior art
P6KE6.8CA Transient Suppression Diodes.
The utility model is not limited to above-mentioned preferred forms, and anyone can draw under enlightenment of the present utility model
Other various forms of products, however, make any change in its shape or structure, it is every with substantially identical with the application
Or close technical scheme, all fall within protection domain of the present utility model.
Claims (8)
1. a kind of RS485CAN differential signals turn single-ended signal module, it is characterised in that：Including RS485 differential signal inputs
Son, RS485 signaling conversion circuits, RS485 single-ended signal lead-out terminal 485-OUT, CAN differential signal input, CAN signal
Change-over circuit and CAN single-ended signal lead-out terminals CAN-OUT；
The RS485 differential signal inputs attached bag includes 485-A-IN ports and 485-B-IN ports；The RS485 signals conversion
Circuit includes piezo-resistance R3, bi-directional voltage clamper type Transient Suppression Diode T1, bi-directional voltage clamper type transient state and suppresses two poles
Pipe T2, terminal resistance R2, SN75176 chip U1, build-out resistor R1 and decoupling capacitance C1；It is the 485-A-IN ports, described
T1 one end, one end of the R2, one end of the R3 and the U1 the 6th pin A link together, the 485-B-IN
Port, one end of the T2, the other end of the R2, the other end of the R3 and the U1 the 7th pin B link together,
Described T1, T2 other end ground connection, the 1st pin RO connections R1 of U1 one end, the other end connection of the R1 are described
RS485 single-ended signal lead-out terminals 485-OUT, the U1 the 4th pin DI connections power supply VCC, the U1 the 2nd pin RE#, the 3rd
Pin DE is grounded, and the 8th pin VCC of the U1 connects power supply VCC, the 5th pin GND of the U1 while described C1 one end is connected
It is grounded while the other end of the C1 is connected；
The CAN differential signal inputs attached bag includes CAN-H-IN ports and CAN-L-IN ports；The CAN signal change-over circuit
Including piezo-resistance R6, bi-directional voltage clamper type Transient Suppression Diode T3, bi-directional voltage clamper type Transient Suppression Diode T4,
Terminal resistance R5, SN65HVD1050 chip U2, build-out resistor R4 and decoupling capacitance C2；It is the CAN-H-IN ports, described
T3 one end, one end of the R6, one end of the R5 and the U2 the 7th pin CANH link together, the CAN-L-
IN ports, one end of the T4, the other end of the R6, the other end of the R5 and the U2 the 6th pin CANL are connected to
Together, described T3, T4 other end are grounded, the 4th pin RXD connections R4 of U2 one end, the other end of the R4
Connect the CAN single-ended signals lead-out terminal CAN-OUT, the 1st pin TXD, the 3rd pin VDD of the U2 of the U2 and described
Decoupling capacitance C2 one end is all connected with power supply VCC, the U2 the 2nd pin VSS, the other end of the decoupling capacitance C2 and is grounded,
The 8th pin Rs connection power supplys VCC of the U2.
2. a kind of RS485CAN differential signals as claimed in claim 1 turn single-ended signal module, it is characterised in that：The R2,
R5 resistance is not less than 100 Europe and no more than 10 kilo-ohms.
3. a kind of RS485CAN differential signals as claimed in claim 1 turn single-ended signal module, it is characterised in that：It is described
RS485 differential signal inputs, RS485 signaling conversion circuits, RS485 single-ended signal lead-out terminal 485-OUT, CAN difference
The quantity of signal input terminal, CAN signal change-over circuit and CAN single-ended signal lead-out terminals CAN-OUT is equal and is not less than
1。
4. a kind of RS485CAN differential signals as claimed in claim 2 turn single-ended signal module, it is characterised in that：The R2,
R5 resistance is 240 Europe.
5. a kind of RS485CAN differential signals as described in any one of claim 1 ~ 4 turn single-ended signal module, it is characterised in that：
Described R3, R6 model are 14K420.
6. a kind of RS485CAN differential signals as described in any one of claim 1 ~ 4 turn single-ended signal module, it is characterised in that：
Described T1, T2, T3, T4 model are P6KE6.8CA.
7. a kind of RS485CAN differential signals as described in any one of claim 1 ~ 4 turn single-ended signal module, it is characterised in that：
Described C1, C2 capacitance are 0.1 microfarad.
8. a kind of RS485CAN differential signals as described in any one of claim 1 ~ 4 turn single-ended signal module, it is characterised in that：
Described R1, R4 resistance are 22 Europe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720356817.1U CN206595981U (en) | 2017-04-07 | 2017-04-07 | RS485CAN differential signals turn single-ended signal module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720356817.1U CN206595981U (en) | 2017-04-07 | 2017-04-07 | RS485CAN differential signals turn single-ended signal module |
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| Publication Number | Publication Date |
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| CN206595981U true CN206595981U (en) | 2017-10-27 |
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| CN201720356817.1U Expired - Fee Related CN206595981U (en) | 2017-04-07 | 2017-04-07 | RS485CAN differential signals turn single-ended signal module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113659976A (en) * | 2020-05-12 | 2021-11-16 | 上海汽车集团股份有限公司 | Differential signal bidirectional isolation communication circuit and method |
-
2017
- 2017-04-07 CN CN201720356817.1U patent/CN206595981U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113659976A (en) * | 2020-05-12 | 2021-11-16 | 上海汽车集团股份有限公司 | Differential signal bidirectional isolation communication circuit and method |
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