CN204480096U - A kind of telecommunication circuit, communication system, frequency converter and frequency converter keyboard - Google Patents
A kind of telecommunication circuit, communication system, frequency converter and frequency converter keyboard Download PDFInfo
- Publication number
- CN204480096U CN204480096U CN201420872683.5U CN201420872683U CN204480096U CN 204480096 U CN204480096 U CN 204480096U CN 201420872683 U CN201420872683 U CN 201420872683U CN 204480096 U CN204480096 U CN 204480096U
- Authority
- CN
- China
- Prior art keywords
- resistance
- signal
- differential
- frequency converter
- mentioned
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Dc Digital Transmission (AREA)
Abstract
The utility model discloses a kind of telecommunication circuit, communication system, frequency converter and frequency converter keyboard, for improving transfer efficiency and transmission range.Described telecommunication circuit comprises: signal driver module and differential processing module; The external control module in first sending and receiving end and the second sending and receiving end of signal driver module, the first sending and receiving end for receiving the first digital signal of control module, and converts the first differential signal to; The signal output part of signal driver module is connected with the first differential input end of differential processing module; The signal input part of signal driver module is connected with the first difference output end of differential processing module, and signal driver module also for receiving the second differential signal from differential processing module, and converts the second digital signal to; Second difference output end of differential processing module and the external external unit of the second differential input end, for sending to external unit by the first differential signal, with for obtaining the second differential signal from external unit and sending to signal driver module.
Description
Technical field
The utility model relates to technical field of electric equipment, is specifically related to a kind of telecommunication circuit, communication system, frequency converter and frequency converter keyboard.
Background technology
Frequency converter is applied more and more wider at present in iron and steel, petrochemical industry, weaving, electric power etc. are a lot, and the effect of the watch-dog of frequency converter is also increasing, the watch-dog mainly frequency converter keyboard of monitoring frequency converter work at present.
Frequency converter keyboard has digital code keyboard, liquid crystal keyboard etc., although this kind of keyboard can meet basic needs, there is following shortcoming simultaneously:
Half-duplex communication circuit is adopted between existing keyboard and frequency converter, can only carry out receiving or sending, and can not carry out receiving and sending simultaneously, cause transfer efficiency low, and anti-interference is poor in transmitting procedure, short haul connection can only be realized, when frequency converter is in comparatively under rugged environment, use keyboard to carry out debugging to frequency converter to carry out near frequency converter, and at environment facies, better distant place can not be carried out, cause inconvenient debugging, also can threaten the personal safety of commissioning staff.
Summary of the invention
For above-mentioned defect, the utility model provides a kind of telecommunication circuit, communication system, frequency converter and frequency converter keyboard, realizes full-duplex communication, improves transfer efficiency, and long transmission distance.
The utility model first aspect provides a kind of telecommunication circuit, comprising: signal driver module and differential processing module;
Wherein, the external control module in the first sending and receiving end and the second sending and receiving end of described signal driver module, described first sending and receiving end is for receiving the first digital signal of control module, and described second sending and receiving end is for sending the second digital signal to described control module;
The signal output part of described signal driver module is connected with the first differential input end of described differential processing module, described signal driver module is used for converting described first digital signal to first differential signal, and is sent to described differential processing module by described signal output part;
The signal input part of described signal driver module is connected with the first difference output end of described differential processing module, described signal driver module also for receiving the second differential signal from described differential processing module, and converts described second differential signal to described second digital signal;
Second difference output end of described differential processing module and the external external unit of the second differential input end, for described first differential signal being sent to described external unit by described second difference output end, with for obtaining described second differential signal by described second differential input end from described external unit and sending to described signal driver module.
The utility model second aspect provides a kind of frequency converter, comprising:
The telecommunication circuit that frequency converter CPU and above-mentioned first aspect provide.
The utility model third aspect provides a kind of frequency converter keyboard, comprising:
The telecommunication circuit that frequency converter keyboard CPU and above-mentioned first aspect provide.
The utility model fourth aspect provides a kind of communication system, comprising:
The frequency converter that above-mentioned second aspect provides and the frequency converter keyboard that the above-mentioned third aspect provides.
As can be seen from the above technical solutions, the utility model has the following advantages:
The first external control module in sending and receiving end of the signal driver module that the utility model provides, the first digital signal can be received from control circuit, then the first digital signal is converted to first differential signal, and the signal output part of signal driver module is connected with the first differential input end of differential processing module, first differential signal is sent to differential processing module by signal output part by signal driver module, by differential processing module, the first differential signal is sent, because digital signal is 0 or 1, pressure drop loss is had in transmitting procedure, long-distance transmissions can not be realized, when apart from time too far away, data transmission fault can be caused, and differential signal is an analog quantity, as long as there is a voltage difference between 2, external unit just can obtain digital signal 1 or 0 according to this pressure reduction, while realizing long-distance transmissions, guarantee that data are correctly transmitted, wherein, the signal driver module that the utility model provides can convert digital signal to differential signal, and differential processing module can carry out voltage stabilizing to differential signal, make differential signal in transmitting procedure, keep a pressure reduction, realize long-distance transmissions, simultaneously, the second external above-mentioned control module in sending and receiving end of above-mentioned signal driver module, the signal input part of synchronous signal driver module connects the first difference output end connection of differential processing module, the second input port external external unit again of differential processing module, therefore, differential processing module can receive the second differential signal from external unit, then the second differential signal is sent to signal driver module, the second differential signal is converted to second digital signal by signal driver module, then control module is sent to by the second sending and receiving end, as can be seen here, in the telecommunication circuit that the utility model provides, signal driver module, differential processing module and simultaneously define a sendaisle and a receiving cable between external control module and external unit, transmission and the reception of signal can be carried out simultaneously, realize full-duplex communication, improve transfer efficiency, and the signal driver module in the utility model can be changed between digital signal and differential signal, differential processing module can effective stable difference signal pressure reduction, ensure that differential signal has a pressure reduction, make take over party can obtain digital signal according to pressure reduction, thus eliminate circuit interference, improve communication distance.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical solution of the utility model, be briefly described to the accompanying drawing used required in the utility model below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural representation of the telecommunication circuit that Fig. 1 provides for the utility model;
Another structural representation of the telecommunication circuit that Fig. 2 provides for the utility model;
Another structural representation of the telecommunication circuit that Fig. 3 provides for the utility model;
Another structural representation of the telecommunication circuit that Fig. 4 provides for the utility model;
The structural representation of the frequency converter that Fig. 5 provides for the utility model;
The structural representation of the frequency converter keyboard that Fig. 6 provides for the utility model;
The structural representation of the communication system that Fig. 7 provides for the utility model.
Embodiment
Below in conjunction with accompanying drawing of the present utility model, be clearly and completely described the technical scheme in the utility model, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
The utility model provides a kind of telecommunication circuit, for improving transfer efficiency and transmission range, meanwhile, the utility model additionally provides a kind of frequency converter and the frequency converter keyboard that comprise this telecommunication circuit, and a kind of communication system comprising this frequency converter and frequency converter keyboard.
With specific embodiment, the utility model will be described in detail below.
The structural representation of a kind of telecommunication circuit that Fig. 1 provides for the utility model, as shown in Figure 1, above-mentioned telecommunication circuit comprises: signal driver module 11 and differential processing module 12;
Wherein, the external control module in the first sending and receiving end and the second sending and receiving end of above-mentioned signal driver module 11, above-mentioned first sending and receiving end is for receiving the first digital signal of control module, and above-mentioned second sending and receiving end is for sending the second digital signal to above-mentioned control module;
The signal output part of above-mentioned signal driver module 11 is connected with the first differential input end of above-mentioned differential processing module 12; Above-mentioned signal driver module 11 for converting above-mentioned first digital signal to first differential signal, and is sent to above-mentioned differential processing module 12 by above-mentioned signal output part;
The signal input part of above-mentioned signal driver module 11 is connected with the first difference output end of above-mentioned differential processing module 12; Above-mentioned signal driver module 11 also for receiving the second differential signal from above-mentioned differential processing module 12, and converts above-mentioned second differential signal to above-mentioned second digital signal;
Second difference output end of above-mentioned differential processing module 12 and the external external unit of the second differential input end; Above-mentioned differential processing module 12 is also for sending to said external equipment by above-mentioned second difference output end by above-mentioned first differential signal, and for obtaining above-mentioned second differential signal by above-mentioned second differential input end from said external equipment, and above-mentioned second differential signal is sent to above-mentioned signal driver module 11.
In the utility model, control module, signal driver module 11, between differential processing module 12 and external unit, form a sendaisle and a receiving cable simultaneously.
In sendaisle, signal driver module 11 receives the first digital signal that control module sends, then the first differential signal is converted to the first digital signal, first differential signal is sent to differential processing module 12, by differential processing module, the first differential signal is sent to external unit, because differential processing module 12 plays pressure stabilization function, the first differential signal can be made to keep a pressure reduction, lower the pressure drop loss in transmitting procedure;
In receiving cable, differential processing module 12 obtains the second differential signal from external unit, and the second differential signal is sent to signal driver module 11, the second differential signal is converted to the second digital signal by signal driver module 11, then the second digital signal is sent to control module.
Above-mentioned sendaisle and receiving cable can work simultaneously, unaffected mutually, can realize sending simultaneously and receiving, achieve full-duplex communication, improve transfer efficiency, further, the differential processing module that the utility model provides plays pressure stabilization function, effective erasure signal interference, lowers the pressure drop loss in transmitting procedure, improves transmission range.
Preferably, when the above-mentioned control module provided in the utility model is frequency converter CPU, said external equipment is frequency converter keyboard; Or when above-mentioned control module is frequency converter keyboard CPU, said external equipment is frequency converter.
Preferably, above-mentioned first digital signal and the second digital signal are TTL (Transistor TransistorLogic, transistor-transistor logic level) signal or COMS signal.
Further, above-mentioned signal driver module 11 is full-duplex communication chip.
Wherein, the D pin of above-mentioned full-duplex communication chip as above-mentioned first sending and receiving end, for receiving the first digital signal of control module; The R pin of above-mentioned full-duplex communication chip as above-mentioned second sending and receiving end, for the second digital signal is sent to above-mentioned control module;
The Y pin of above-mentioned full-duplex communication chip and Z pin are as above-mentioned signal output part, for the first differential signal is sent to differential processing module 12, the B pin of above-mentioned full-duplex communication chip and A pin as above-mentioned signal input part, for receiving the second differential signal from differential processing module 12.
Be understandable that, above-mentioned full-duplex communication chip also comprises GND pin and VCC pin, wherein GND pin ground connection, and VCC pin connects power supply.
Alternatively, above-mentioned VCC can also connect ground connection after electric capacity.Above-mentioned D pin can link control module after contact resistance, and equally, R pin can link control module after contact resistance, and resistance can play metering function herein.
Alternatively, above-mentioned power supply is+5V power supply.
Alternatively, above-mentioned full-duplex communication chip can be 75179 chips, MAX488 chip, MAX490 chip, SP3077 chip, LTC490 chip, SN75179 chip and 422 chips etc.
The structural representation of the telecommunication circuit that Fig. 2 provides for another embodiment of the utility model, in fig. 2, above-mentioned signal processing module comprises: difference transtation mission circuit and differential receive circuitry;
Wherein, the input end of above-mentioned difference transtation mission circuit is connected with the signal output part of above-mentioned signal driver module 11, and above-mentioned difference transtation mission circuit is used for receiving above-mentioned first differential signal from above-mentioned signal driver module 11;
The external said external equipment of output terminal of above-mentioned difference transtation mission circuit, for sending above-mentioned first differential signal to said external equipment by above-mentioned output terminal;
The output terminal of above-mentioned differential receive circuitry is connected with the signal input part of above-mentioned signal driver module 11, and above-mentioned differential receive circuitry is used for above-mentioned second differential signal to send to above-mentioned signal driver module 11;
The input end of above-mentioned differential receive circuitry and external said external equipment, for receiving above-mentioned second differential signal by above-mentioned input end from said external equipment.
In a specific embodiment, as shown in Figure 3, above-mentioned difference transtation mission circuit comprises: electric capacity C2, electric capacity C3, electric capacity C4, resistance R3, resistance R4, resistance R5, resistance R9, resistance R10, resistance R11, clamp diode D1 and clamp diode D3.
Wherein, one termination power of above-mentioned resistance R4, the other end ground connection after above-mentioned resistance R5 and resistance R3 successively of above-mentioned resistance R4, above-mentioned resistance R4 two ends above-mentioned electric capacity C3 in parallel, above-mentioned resistance R5 two ends above-mentioned electric capacity C4 in parallel, above-mentioned resistance R3 two ends above-mentioned electric capacity C2 in parallel, the negative electrode of above-mentioned clamp diode D1 connects the tie point of above-mentioned resistance R4 and resistance R5, the negative electrode of above-mentioned clamp diode D3 connects the tie point of above-mentioned resistance R5 and resistance R3, above-mentioned clamp diode D1 is connected with the anode of clamp diode D3 and ground connection, the two ends of above-mentioned resistance R5 are as the input end of above-mentioned difference transtation mission circuit, be connected with the Y pin of full-duplex communication chip and Z pin respectively,
Above-mentioned resistance R4 is connected with above-mentioned resistance R9 one end with the tie point of resistance R5, above-mentioned resistance R5 is connected with above-mentioned resistance R11 one end with the tie point of resistance R3, the other end of above-mentioned resistance R9 is connected with one end of above-mentioned resistance R10, the other end of above-mentioned resistance R11 is connected with the other end of above-mentioned resistance R10, and the two ends of above-mentioned resistance R10 are as the output terminal of above-mentioned difference transtation mission circuit;
Above-mentioned differential receive circuitry comprises: electric capacity C5, electric capacity C6, electric capacity C7, resistance R6, resistance R7, resistance R8, resistance R12, resistance R13, resistance R14, clamp diode D2 and clamp diode D4;
Wherein, above-mentioned resistance R7 one end ground connection, above-mentioned resistance R7 connects power supply after above-mentioned resistance R8 and resistance R6, above-mentioned resistance R7 two ends above-mentioned electric capacity C6 in parallel, above-mentioned resistance R8 two ends above-mentioned electric capacity C7 in parallel, above-mentioned resistance R6 two ends above-mentioned electric capacity C5 in parallel, the negative electrode of above-mentioned clamp diode D2 connects the tie point of above-mentioned resistance R8 and resistance R7, the negative electrode of above-mentioned clamp diode D4 connects the tie point of above-mentioned resistance R8 and resistance R6, above-mentioned clamp diode D2 is connected with the anode of clamp diode D4 and ground connection, the two ends of above-mentioned resistance R8 are as the output terminal of above-mentioned differential receive circuitry, be connected with the B pin of full-duplex communication chip and A pin respectively,
Above-mentioned resistance R7 is connected with above-mentioned resistance R12 one end with the tie point of resistance R8, above-mentioned resistance R8 is connected with above-mentioned resistance R14 one end with the tie point of above-mentioned resistance R6, the other end of above-mentioned resistance R12 connects one end of above-mentioned resistance R13, the other end of above-mentioned resistance R13 connects the other end of above-mentioned resistance R14, and the two ends of above-mentioned resistance R13 are as the input end of above-mentioned differential receive circuitry.
Alternatively, above-mentioned power supply can be+5V power supply.
Based on the embodiment shown in Fig. 3, the principle of work of telecommunication circuit is:
Difference transtation mission circuit receives the digital signal that control module sends, and this digital signal is sent to full-duplex communication chip by D pin, full-duplex communication chip converts digital signal to first differential signal, then the first differential signal is sent to difference transtation mission circuit.Clamp diode D1 in difference transtation mission circuit and clamp diode D3 carries out voltage clamping to this differential signal, by its clamper to certain pressure reduction, plays pressure stabilization function.In addition, in difference transtation mission circuit, resistance R3, the resistance R5 of series connection and resistance R4 play pressure stabilization function, and resistance R9, resistance 10 and resistance R11 play the effect of current limliting.
Otherwise differential receive circuitry receives the second differential signal from external unit, clamp diode D2 and the clamp diode D4 of differential receive circuitry carry out clamper to the second differential signal.Second differential signal is sent to full-duplex communication chip by differential receive circuitry, and full-duplex communication chip obtains digital signal according to the pressure reduction of the second differential signal, then digital signal is sent to control module.
Such as, if the pressure reduction of the second differential signal that receives of full-duplex communication chip on the occasion of, obtain a digital signal " 1 ", otherwise the pressure reduction of the second differential signal is negative value, obtains a digital signal " 0 ".
In differential receive circuitry, resistance R7, the resistance R8 of series connection and resistance R6 play pressure stabilization function, and resistance R12, resistance 13 and resistance R14 play the effect of current limliting.
Attached embodiment illustrated in fig. 3 in, the equal ground connection of anode of clamp diode D1 and clamp diode D3, can stablize the pressure reduction of the first differential signal by clamper.Similarly, the equal ground connection of anode of clamp diode D2 and clamp diode D4, can stablize the pressure reduction of the second differential signal by clamper.
Further, as shown in Figure 4, above-mentioned difference transtation mission circuit also comprises diode D5, and the anode of above-mentioned diode D5 is connected with the anode of clamp diode D3 with the anode of clamp diode D1, the plus earth of diode D5.
Wherein, by above-mentioned diode D5, the clamper pressure differential range of clamp diode D1 and clamp diode D3 can be expanded, can set according to embody rule occasion.
Similarly, above-mentioned differential receive circuitry also comprises diode D6, and the anode of above-mentioned diode D6 is connected with the anode of clamp diode D4 with the anode of clamp diode D2, the plus earth of above-mentioned diode D6.
Wherein, by above-mentioned diode D6, clamp diode D2 and clamp diode D4 clamper pressure differential range can be expanded, set according to embody rule occasion.
As shown in Figure 5, the utility model provides a kind of frequency converter, comprises the telecommunication circuit of frequency converter CPU and above-mentioned introduction.
Wherein, namely frequency converter CPU is the control module in above-mentioned introduction, and in addition, structure and the principle of work of telecommunication circuit are as above introduced, and do not repeat them here.
As indicated with 6, the utility model additionally provides a kind of frequency converter keyboard, comprising: the telecommunication circuit of frequency converter keyboard CPU and above-mentioned introduction.
Wherein, namely frequency converter keyboard CPU is the control module in above-mentioned introduction, and in addition, structure and the principle of work of telecommunication circuit are as above introduced, and do not repeat them here.
As shown in Figure 7, the utility model additionally provides a kind of communication system, comprise: the frequency converter shown in accompanying drawing 5 and the frequency converter keyboard shown in accompanying drawing 6, wherein, frequency converter comprises the telecommunication circuit of frequency converter CPU and above-mentioned introduction, and frequency converter keyboard comprises the telecommunication circuit of frequency converter keyboard CPU and above-mentioned introduction.
Wherein, the digital signal that frequency converter CPU sends is after telecommunication circuit, be converted into differential signal, then this differential signal is sent to the telecommunication circuit of frequency converter keyboard, the telecommunication circuit of frequency converter keyboard obtains digital signal according to this differential signal, and this digital signal is sent to frequency converter keyboard CPU.
In like manner, the digital signal that frequency converter keyboard CPU sends is after telecommunication circuit, be converted into differential signal, then this differential signal is sent to the telecommunication circuit of frequency converter, the telecommunication circuit of frequency converter obtains a digital signal according to this differential signal, and this digital signal is sent to frequency converter CPU.
Therefore, by using above-mentioned telecommunication circuit in frequency converter and frequency converter keyboard simultaneously, the full-duplex communication between frequency converter and frequency converter keyboard can not only be realized, improve transfer efficiency, can also transmission range be improved.
In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiments.
Above a kind of telecommunication circuit provided by the utility model, communication system, frequency converter and frequency converter keyboard are described in detail, for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (10)
1. a telecommunication circuit, is characterized in that, comprising: signal driver module and differential processing module;
Wherein, the external control module in the first sending and receiving end and the second sending and receiving end of described signal driver module, described first sending and receiving end is for receiving the first digital signal of control module, and described second sending and receiving end is for sending the second digital signal to described control module;
The signal output part of described signal driver module is connected with the first differential input end of described differential processing module, described signal driver module is used for converting described first digital signal to first differential signal, and is sent to described differential processing module by described signal output part;
The signal input part of described signal driver module is connected with the first difference output end of described differential processing module, described signal driver module also for receiving the second differential signal from described differential processing module, and converts described second differential signal to described second digital signal;
Second difference output end of described differential processing module and the external external unit of the second differential input end, for described first differential signal being sent to described external unit by described second difference output end, with for obtaining described second differential signal by described second differential input end from described external unit and sending to described signal driver module.
2. telecommunication circuit according to claim 1, is characterized in that,
Described differential processing module comprises difference transtation mission circuit and differential receive circuitry, the input end of described difference transtation mission circuit is connected with the signal output part of described signal driver module, and described difference transtation mission circuit is used for receiving described first differential signal from described signal driver module; The external described external unit of output terminal of described difference transtation mission circuit, for sending described first differential signal to described external unit by described output terminal;
The output terminal of described differential receive circuitry is connected with the signal input part of described signal driver module, and described differential receive circuitry is used for described second differential signal to send to described signal driver module; The external described external unit of input end of described differential receive circuitry, for receiving described second differential signal by described input end from described external unit.
3. telecommunication circuit according to claim 2, is characterized in that,
Described difference transtation mission circuit comprises: electric capacity C2, electric capacity C3, electric capacity C4, resistance R3, resistance R4, resistance R5, resistance R9, resistance R10, resistance R11, clamp diode D1 and clamp diode D3;
Wherein, one termination power of described resistance R4, the other end ground connection after described resistance R5 and resistance R3 successively of described resistance R4, described resistance R4 two ends described electric capacity C3 in parallel, described resistance R5 two ends described electric capacity C4 in parallel, described resistance R3 two ends described electric capacity C2 in parallel, the negative electrode of described clamp diode D1 connects the tie point of described resistance R4 and resistance R5, the negative electrode of described clamp diode D3 connects the tie point of described resistance R5 and resistance R3, described clamp diode D1 is connected with the anode of clamp diode D3 and ground connection, the two ends of described resistance R5 are as the input end of described difference transtation mission circuit,
Described resistance R4 is connected with described resistance R9 one end with the tie point of resistance R5, described resistance R5 is connected with described resistance R11 one end with the tie point of resistance R3, the other end of described resistance R9 is connected with one end of described resistance R10, the other end of described resistance R11 is connected with the other end of described resistance R10, and the two ends of described resistance R10 are as the output terminal of described difference transtation mission circuit;
Described differential receive circuitry comprises: electric capacity C5, electric capacity C6, electric capacity C7, resistance R6, resistance R7, resistance R8, resistance R12, resistance R13, resistance R14, clamp diode D2 and clamp diode D4;
Wherein, described resistance R7 one end ground connection, described resistance R7 connects power supply after described resistance R8 and resistance R6, described resistance R7 two ends described electric capacity C6 in parallel, described resistance R8 two ends described electric capacity C7 in parallel, described resistance R6 two ends described electric capacity C5 in parallel, the negative electrode of described clamp diode D2 connects the tie point of described resistance R8 and resistance R7, the negative electrode of described clamp diode D4 connects the tie point of described resistance R8 and resistance R6, the anode of described clamp diode D2 is connected with clamp diode D4 and ground connection, the two ends of described resistance R8 are as the output terminal of described differential receive circuitry,
Described resistance R7 is connected with described resistance R12 one end with the tie point of resistance R8, described resistance R8 is connected with described resistance R14 one end with the tie point of described resistance R6, the other end of described resistance R12 connects one end of described resistance R13, the other end of described resistance R13 connects the other end of described resistance R14, and the two ends of described resistance R13 are as the input end of described differential receive circuitry.
4. telecommunication circuit according to claim 3, is characterized in that, described difference transtation mission circuit also comprises diode D5, and the anode of described diode D5 is connected with the anode of clamp diode D3 with the anode of clamp diode D1, the plus earth of described diode D5;
Described difference transtation mission circuit also comprises diode D6, and the anode of described diode D6 is connected with the anode of clamp diode D4 with the anode of clamp diode D2, the plus earth of described diode D6.
5. the telecommunication circuit according to any one of Claims 1 to 4, is characterized in that,
Described signal driver module is full-duplex communication chip, and the D pin of described full-duplex communication chip is as described first sending and receiving end, and the R pin of described full-duplex communication chip is as described second sending and receiving end;
The Y pin of described full-duplex communication chip and Z pin are as described signal output part, and the B pin of described full-duplex communication chip and A pin are as described signal input part.
6. telecommunication circuit according to claim 5, is characterized in that, described full-duplex communication chip comprises: 75179 chips, MAX488 chip, MAX490 chip, SP3077 chip, LTC490 chip, SN75179 chip and 422 chips.
7. telecommunication circuit according to claim 1, is characterized in that,
Described control module is frequency converter CPU, and described external unit is frequency converter keyboard;
Or described control module is frequency converter keyboard CPU, described external unit is frequency converter.
8. a frequency converter, is characterized in that, comprising:
Frequency converter CPU and the telecommunication circuit as described in any one of claim 1 ~ 6.
9. a frequency converter keyboard, is characterized in that, comprising:
Frequency converter keyboard CPU and the telecommunication circuit as described in any one of claim 1 ~ 6.
10. a communication system, is characterized in that, comprising:
Frequency converter as claimed in claim 8 and frequency converter keyboard as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420872683.5U CN204480096U (en) | 2014-12-31 | 2014-12-31 | A kind of telecommunication circuit, communication system, frequency converter and frequency converter keyboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420872683.5U CN204480096U (en) | 2014-12-31 | 2014-12-31 | A kind of telecommunication circuit, communication system, frequency converter and frequency converter keyboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204480096U true CN204480096U (en) | 2015-07-15 |
Family
ID=53635875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420872683.5U Expired - Fee Related CN204480096U (en) | 2014-12-31 | 2014-12-31 | A kind of telecommunication circuit, communication system, frequency converter and frequency converter keyboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204480096U (en) |
-
2014
- 2014-12-31 CN CN201420872683.5U patent/CN204480096U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203444468U (en) | Communication convertor | |
| CN107395243A (en) | A kind of single-wire communication circuit | |
| CN205142203U (en) | Automatic transceiver circuits of RS485 | |
| CN103294629B (en) | A kind of interface conversion circuit and device | |
| CN103684528A (en) | Power line carrier and wireless dual-channel network communication module | |
| CN205302279U (en) | Serial interface data protocol converter | |
| CN102169472A (en) | RS485 bus interface circuit | |
| CN205880862U (en) | Serial communication expansion board | |
| CN104702315B (en) | A kind of carrier communication circuit and electronic equipment | |
| CN204480096U (en) | A kind of telecommunication circuit, communication system, frequency converter and frequency converter keyboard | |
| CN103647544A (en) | Two-way transmission interface conversion circuit | |
| CN204129454U (en) | A kind of data conversion adaptive circuit and electronic equipment | |
| CN203632640U (en) | Two-way transmission interface converting circuit | |
| CN202126687U (en) | RS485 bus interface circuit | |
| CN202602676U (en) | A CAN signal transmission circuit | |
| CN206149237U (en) | Multichannel differential signal changes TTL level signal's conversion and protection system | |
| CN204119205U (en) | A kind of two optocoupler RS485 circuit | |
| CN201018493Y (en) | Universal transmission device for narrowband power line communication | |
| CN217386167U (en) | ARINC429 bus demodulation circuit based on general device realization | |
| CN203104437U (en) | Power carrier transceiver circuit | |
| CN203014651U (en) | Frequency converter input circuit and frequency converter | |
| CN202257561U (en) | Protocol converters | |
| CN201893700U (en) | 5V-3.3V level conversion and communication circuit | |
| CN202586965U (en) | Charge pump and transmitting device employing charge pump | |
| CN104009782A (en) | Bluetooth wireless communication transmission system and method based on portal terminal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150715 Termination date: 20211231 |