CN217307685U - High-speed RS485 self-receiving and transmitting communication device - Google Patents
High-speed RS485 self-receiving and transmitting communication device Download PDFInfo
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- CN217307685U CN217307685U CN202221234627.XU CN202221234627U CN217307685U CN 217307685 U CN217307685 U CN 217307685U CN 202221234627 U CN202221234627 U CN 202221234627U CN 217307685 U CN217307685 U CN 217307685U
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Abstract
The utility model relates to a high-speed RS485 self-receiving and transmitting communication device, belonging to the technical field of transmission line detection; the protection device comprises a signal input end, a signal conversion module, a protection module, a self-receiving and sending control module and an RS485 output end, wherein the signal input end is in signal connection with the signal conversion module and the self-receiving and sending control module; the automatic switching of the receiving and transmitting directions and the switching of the receiving and transmitting states of the RS485 are realized through the self-receiving and transmitting control module and the signal conversion module, the self-receiving and transmitting RS485 communication is completed, the required number of GPIOs in the MCU is reduced, the MCU resource is released, the control logic of software during communication is simplified, and the occurrence of equipment communication faults caused by improper time sequence control is avoided; meanwhile, compared with a common triode, the MOS tube Q1 has higher response speed and lower waveform distortion rate, so that the defect of low communication baud rate of the traditional RS485 self-transceiving circuit can be overcome.
Description
Technical Field
The utility model relates to a high rate RS485 is from receiving and dispatching communication device belongs to transmission line and detects technical field.
Background
With the continuous development of industrial control technology and the increasingly wide application of computer network communication technology, RS485 has come into existence as a bus communication technology which can be suitable for long-distance digital communication. The RS485 bus is mainly used for information transmission and data exchange with various external industrial devices, and has effective noise suppression capability, high data transmission rate, good data transmission reliability and extendable communication cable length which are not comparable to those of many other industrial communication standards. Therefore, the RS485 bus is widely used in many fields. Meanwhile, the internal structure of the electronic equipment is highly integrated (VLSI chip), so that certain requirements are placed on the optimized use of the chip, resources are saved, the design is simplified, and the optimal performance of the chip is exerted in an optimal configuration.
However, the existing non-self-receiving and transmitting RS485 communication needs to carry out data receiving and transmitting control, and the communication of the self-receiving and transmitting RS485 communication circuit has the defect of low baud rate.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the defects of the prior art are overcome, the high-speed RS485 self-receiving and transmitting communication device is provided, and the defects that data receiving and transmitting control is required in the existing non-self-receiving and transmitting RS485 communication and the communication baud rate of a self-receiving and transmitting RS485 communication circuit is low are overcome.
The high-speed RS485 self-receiving and transmitting communication device comprises a signal input end, a signal conversion module, a protection module, a self-receiving and transmitting control module and an RS485 output end, wherein the signal input end is in signal connection with the signal conversion module and the self-receiving and transmitting control module, the signal conversion module is in signal connection with the self-receiving and transmitting control module and the protection module, the protection module is in signal connection with the RS485 output end,
signal input terminal: used for inputting TTL signals;
the signal conversion module: the RS485 level state conversion is realized;
a protection module: the signal conversion module is used for protection;
the self-transmitting and receiving control module: the RS485 receiving and transmitting direction is automatically switched through the MOS tube Q1;
an RS485 output end: the device is used for communicating data interaction with external equipment.
The automatic switching of the receiving and transmitting directions and the switching of the receiving and transmitting states of the RS485 are realized through the self-receiving and transmitting control module and the signal conversion module, the self-receiving and transmitting RS485 communication is completed, the required number of GPIOs in the MCU is reduced, the MCU resource is released, the control logic of software during communication is simplified, and the occurrence of equipment communication faults caused by improper time sequence control is avoided; meanwhile, compared with a common triode, the MOS tube Q1 has higher response speed and lower waveform distortion rate, so that the defect of low communication baud rate of the traditional RS485 self-transceiving circuit can be overcome.
Preferably, the signal conversion module comprises resistors R1, R2, R4, R5, R6 and an integrated chip U1.
Preferably, one end of each of the resistors R1, R2, R4 and R6 is connected to pin 4, pin 1, pin 8 and pin 5 of the integrated chip U1, and pin 8 and pin 5 of the integrated chip U1 are also connected to the power VCC and the ground, respectively; the other ends of the resistors R1 and R2 are both connected with a power supply VCC; the other ends of the resistors R4 and R6 are respectively connected with a pin 6 and a pin 7 of the integrated chip U1; two ends of the resistor R5 are respectively connected with the pin 6 and the pin 7 of the integrated chip U1.
Resistors R1, R2, R4 and R6 are respectively arranged on a pin 4, a pin 1, a pin 8 and a pin 5 of an integrated chip U1, and the current leakage speed and the stability of a circuit can be improved through the resistors R1, R2, R4 and R6.
Preferably, the protection module includes TVS D1, D2, D3, self-healing fuses F1, F2 and a gas discharge tube G1.
Preferably, two ends of the TVS D1 are respectively connected to pins 6 and 7 of the integrated chip U1; one ends of TVS D2 and D3 are respectively connected with the 7 pin and the 6 pin of the integrated chip U1, and the other ends are grounded; one ends of self-recovery fuses F1 and F2 are respectively connected with pins 7 and 6 of the integrated chip U1, and the other ends of the self-recovery fuses are respectively connected with pins 3 and 1 of the gas discharge tube G1; the 2-pin of the gas discharge tube G1 is grounded.
Gas discharge tube G1 has that insulation resistance is big, parasitic capacitance is little, surge protection ability advantage etc. has a few for first order surge protection can let out most ability fast when surge input device, weakens the impact of surge to second grade protection components and parts, can prolong the life of second grade protection components and parts such as TVS D1, D2, D3 simultaneously by a wide margin, self-resuming fuse F1, F2.
Preferably, the self-transceiving control module comprises a MOS transistor Q1, resistors R7, R8 and a capacitor C1.
Preferably, a pin 1 of the MOS transistor Q1 is connected to one ends of the resistors R7 and R8, and the other ends of the resistors R7 and R8 are respectively connected to a pin 4 of the integrated chip U1 and ground; a pin 3 of the MOS transistor Q1 is connected with one end of a capacitor C1, a pin 2 and a pin 3 of the integrated chip U1, and the other end of the capacitor C1 is connected with the ground; the pin 2 of the MOS transistor Q1 is connected to ground.
When RS485 carries out high-speed data transmission, the MOS tube Q1 has higher response speed and lower waveform distortion rate than a common triode, and meanwhile, the resistor R1 can accelerate the current discharge speed of the MOS tube Q1 in the off state and improve the corresponding speed of the MOS tube Q1 as a switching tube; meanwhile, the stability of the Q1 state is enhanced, and communication abnormity caused by unstable switch tube state or delayed response is avoided.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses a high rate RS485 is from receiving and dispatching communication device can reduce the demand quantity to GPIO in the MCU, releases MCU resource, and the control logic of software when simplifying the communication avoids leading to the emergence of equipment communication trouble because of the time sequence control is improper; meanwhile, the scheme makes up the defect that the communication baud rate of the traditional RS485 self-transceiving circuit is low, greatly prolongs the service life of the protection component, and has certain use and popularization values.
Drawings
Fig. 1 is a block diagram of a high-rate RS485 self-transceiving communication device according to the present invention;
fig. 2 is a schematic circuit diagram of the high-speed RS485 self-transceiving communication device of the present invention.
Wherein: 1. a signal input terminal; 2. a signal conversion module; 3. a protection module; 4. a self-transmitting/receiving control module; 5. and an RS485 output terminal.
Detailed Description
The invention will be further described with reference to the accompanying drawings:
example 1
As shown in the figures 1-2, the high-speed RS485 self-transceiving communication device of the present invention comprises a signal input terminal 1, a signal conversion module 2, a protection module 3, a self-transceiving control module 4 and an RS485 output terminal 5, wherein the signal input terminal 1 is connected with the signal conversion module 2 and the self-transceiving control module 4 by signals, the signal conversion module 2 is connected with the self-transceiving control module 4 and the protection module 3 by signals, the protection module 3 is connected with the RS485 output terminal 5 by signals,
signal input terminal 1: used for inputting TTL signals;
the signal conversion module 2: the RS485 level state conversion is realized;
the protection module 3: used for protecting the signal conversion module 2;
the self-transceiving control module 4: the RS485 receiving and transmitting direction is automatically switched through the MOS tube Q1;
RS485 output 5: the device is used for communicating data interaction with external equipment.
The automatic switching of the receiving and transmitting directions and the switching of the receiving and transmitting states of the RS485 are realized through the self-receiving and transmitting control module 4 and the signal conversion module 2, the self-receiving and transmitting RS485 communication is completed, the number of required GPIOs in an MCU is reduced, MCU resources are released, the control logic of software during communication is simplified, and the occurrence of communication faults of equipment caused by improper time sequence control is avoided; meanwhile, compared with a common triode, the MOS tube Q1 has higher response speed and lower waveform distortion rate, so that the defect of low communication baud rate of the traditional RS485 self-transceiving circuit can be overcome.
Here, high rate RS485 still includes the shell from receiving and dispatching communication device, signal input part 1 and RS485 output 5 inlay on the shell, signal conversion module 2, protection module 3, pass through the circuit board setting in the shell from receiving and dispatching control module 4, are connected the signal of receiving and dispatching with external equipment through signal input part 1 and RS485 output 5. High rate RS485 is from receiving and dispatching communication device's improvement focus on inside circuit structure, and its shell is the same with current RS485 communication device's shell, for prior art, no longer gives unnecessary details.
As shown in fig. 2, the signal conversion module 2 includes resistors R1, R2, R4, R5, R6 and an integrated chip U1; the protection module 3 comprises TVS D1, D2, D3, self-recovery fuses F1, F2 and a gas discharge tube G1; the self-transceiving control module 4 comprises a MOS transistor Q1, resistors R7 and R8 and a capacitor C1.
Specifically, one end of each of the resistors R1, R2, R4 and R6 is connected to pin 4, pin 1, pin 8 and pin 5 of the integrated chip U1, and pin 8 and pin 5 of the integrated chip U1 are connected to VCC and ground; the other ends of the resistors R1 and R2 are both connected with a power supply VCC; the other ends of the resistors R4 and R6 are respectively connected with a pin 6 and a pin 7 of the integrated chip U1; two ends of the resistor R5 are respectively connected with the pin 6 and the pin 7 of the integrated chip U1.
Resistors R1, R2, R4 and R6 are respectively arranged on a pin 4, a pin 1, a pin 8 and a pin 5 of an integrated chip U1, and the current leakage speed and the stability of a circuit can be improved through the resistors R1, R2, R4 and R6.
Two ends of the TVS D1 are respectively connected with pins 6 and 7 of an integrated chip U1; one ends of the TVS D2 and D3 are respectively connected with a pin 7 and a pin 6 of the integrated chip U1, and the other ends are grounded; one ends of self-recovery fuses F1 and F2 are respectively connected with pins 7 and 6 of the integrated chip U1, and the other ends of the self-recovery fuses are respectively connected with pins 3 and 1 of the gas discharge tube G1; the 2-pin of the gas discharge tube G1 is grounded.
Gas discharge tube G1 has that insulation resistance is big, parasitic capacitance is little, surge protection ability advantage etc. has a few for first order surge protection can let out most ability fast when surge input device, weakens the impact of surge to second grade protection components and parts, can prolong the life of second grade protection components and parts such as TVS D1, D2, D3 simultaneously by a wide margin, self-resuming fuse F1, F2.
A pin 1 of the MOS transistor Q1 is connected with one ends of resistors R7 and R8, and the other ends of the resistors R7 and R8 are respectively connected with a pin 4 of the integrated chip U1 and the ground; a pin 3 of the MOS transistor Q1 is connected with one end of a capacitor C1, a pin 2 and a pin 3 of the integrated chip U1, and the other end of the capacitor C1 is connected with the ground; the pin 2 of the MOS transistor Q1 is connected to ground.
When RS485 carries out high-speed data transmission, the MOS tube Q1 has higher response speed and lower waveform distortion rate than a common triode, and meanwhile, the resistor R1 can accelerate the current discharge speed of the MOS tube Q1 in the off state and improve the corresponding speed of the MOS tube Q1 as a switching tube; meanwhile, the stability of the Q1 state is enhanced, and communication abnormity caused by unstable switch tube state or untimely response is avoided.
High rate RS485 is from receiving and dispatching communication device, the working process as follows:
the TTL signal is received through a signal input end 1 and is sent to a signal conversion module 2 and a self-transceiving control module 4; the automatic transceiving control module 4 realizes the automatic switching of the RS485 transceiving direction through the MOS tube Q1 and realizes the switching of the RS485 transceiving state through the signal conversion module 2; the signal converted by the signal conversion module 2 enters the protection module 3, and the protection module 3 performs surge protection processing on the signal and outputs the signal to the RS485 output end 5; and the RS485 output end 5 is communicated with external equipment for data interaction.
Of course, the foregoing is merely exemplary of the present invention and should not be construed as limiting the scope of the present invention. The present invention is not limited to the above examples, and the technical field of the present invention is equivalent to the changes and improvements made in the actual range of the present invention, which should be attributed to the patent coverage of the present invention.
Claims (7)
1. A high-speed RS485 self-receiving and transmitting communication device is characterized by comprising a signal input end (1), a signal conversion module (2), a protection module (3), a self-receiving and transmitting control module (4) and an RS485 output end (5), wherein the signal input end (1) is in signal connection with the signal conversion module (2) and the self-receiving and transmitting control module (4), the signal conversion module (2) is in signal connection with the self-receiving and transmitting control module (4) and the protection module (3), the protection module (3) is in signal connection with the RS485 output end (5),
signal input (1): used for inputting TTL signals;
signal conversion module (2): the RS485 level state conversion is realized;
protection module (3): is used for protecting the signal conversion module (2);
self-transceiving control module (4): the RS485 receiving and transmitting direction is automatically switched through the MOS tube Q1;
RS485 output (5): the device is used for communicating data interaction with external equipment.
2. The RS485 self-transceiving communication device according to claim 1, wherein the signal conversion module (2) comprises resistors R1, R2, R4, R5, R6 and an integrated chip U1.
3. The high-speed RS485 self-transceiving communication device according to claim 2, wherein one end of each of the resistors R1, R2, R4 and R6 is respectively connected to pin 4, pin 1, pin 8 and pin 5 of the ic U1, and pin 8 and pin 5 of the ic U1 are respectively connected to VCC and ground; the other ends of the resistors R1 and R2 are both connected with a power supply VCC; the other ends of the resistors R4 and R6 are respectively connected with a pin 6 and a pin 7 of the integrated chip U1; two ends of the resistor R5 are respectively connected with the pin 6 and the pin 7 of the integrated chip U1.
4. The high-speed RS485 self-transceiving communication device according to claim 1, wherein the protection module (3) comprises TVSD1, D2, D3, self-recovery fuses F1, F2 and a gas discharge tube G1.
5. The high-rate RS485 self-transceiving communication device of claim 4, wherein two ends of the TVSD1 are respectively connected with pins 6 and 7 of an integrated chip U1; one ends of TVSD2 and D3 are respectively connected with the 7 pin and the 6 pin of the integrated chip U1, and the other ends are grounded; one ends of self-recovery fuses F1 and F2 are respectively connected with pins 7 and 6 of the integrated chip U1, and the other ends of the self-recovery fuses are respectively connected with pins 3 and 1 of the gas discharge tube G1; the 2-pin of the gas discharge tube G1 is grounded.
6. The high-rate RS485 self-transceiving communication device according to claim 1, wherein the self-transceiving control module (4) comprises a MOS transistor Q1, resistors R7, R8 and a capacitor C1.
7. The high-speed RS485 self-transceiving communication device according to claim 6, wherein a pin 1 of the MOS transistor Q1 is connected to one ends of resistors R7 and R8, and the other ends of the resistors R7 and R8 are respectively connected to a pin 4 of the integrated chip U1 and ground; a pin 3 of the MOS transistor Q1 is connected with one end of a capacitor C1, a pin 2 and a pin 3 of the integrated chip U1, and the other end of the capacitor C1 is connected with the ground; the pin 2 of the MOS transistor Q1 is connected to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221234627.XU CN217307685U (en) | 2022-05-20 | 2022-05-20 | High-speed RS485 self-receiving and transmitting communication device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221234627.XU CN217307685U (en) | 2022-05-20 | 2022-05-20 | High-speed RS485 self-receiving and transmitting communication device |
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| Publication Number | Publication Date |
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| CN217307685U true CN217307685U (en) | 2022-08-26 |
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| CN202221234627.XU Active CN217307685U (en) | 2022-05-20 | 2022-05-20 | High-speed RS485 self-receiving and transmitting communication device |
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- 2022-05-20 CN CN202221234627.XU patent/CN217307685U/en active Active
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