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Relay circuit for half duplex communication and half duplex communication circuit

A relay circuit and half-duplex technology, applied in the field of half-duplex communication, to increase the number of nodes and reduce the distortion of data signals

Inactive Publication Date: 2017-01-04
ZHEJIANG FONDA CONTROL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although in theory, when the data communication rate is lower than 100Kbps, the transmission distance through RS485 can reach 1200 meters, but in some long-distance transmission occasions, this still cannot meet the requirements

Method used

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  • Relay circuit for half duplex communication and half duplex communication circuit
  • Relay circuit for half duplex communication and half duplex communication circuit
  • Relay circuit for half duplex communication and half duplex communication circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Reference figure 1 , Shows a transceiver circuit for half-duplex communication, which includes a communication chip U1, a switching device Q1, a resistor R1, and a resistor R2.

[0032] In the transceiver circuit, the communication chip U1 and the communication chip U2 are 485 chips, and the switching device Q1 and the switching device Q2 are field effect transistors. The communication chip can also be a chip for half-duplex communication such as the CC2520 zigbee chip. The switching device can also be a controllable switching device such as GTO, GTR or MOSFET.

[0033] In the transceiver circuit, the 485 chip U1 has two data transceiver terminals A and B, a receiving enable terminal DE, a transmission enable terminal RE, an output terminal RO, an input terminal DI, and a VCC terminal and A GND terminal; among them, the data transceiver terminals A and B are used to receive or send data signals; the receiving enable terminal DE is used to make the data transceiver terminal i...

Embodiment 2

[0037] Reference figure 2 , Shows a relay circuit for half-duplex communication, which includes a 485 chip U1, a field effect transistor Q1, a resistor R1, a resistor R2, a 485 chip U2, a field effect transistor Q2, a resistor R3, and a resistor R4.

[0038] In the relay circuit, the 485 chip U1, the field effect transistor Q1, the resistor R1, and the resistor R2 constitute the above-mentioned transceiver circuit, which is hereinafter referred to as the first transceiver circuit 100; in the relay circuit, the 485 chip U2, the field The effect transistor Q2, the resistor R3, and the resistor R4 constitute another transceiver circuit described above, which is referred to as the second transceiver circuit 200 below.

[0039] In the first transceiver circuit 100 of the relay circuit, the 485 chip U1 has two data transceiver terminals A and B, a reception enable terminal DE, a transmission enable terminal RE, an output terminal RO, and an input terminal DI. And a VCC terminal and a GN...

Embodiment 3

[0045] Reference image 3 , Shows a relay circuit for half-duplex communication, which is an improvement on the relay circuit provided in the second embodiment. Specifically, the output terminal of the first transceiver circuit 100 is coupled to the input terminal of the second transceiver circuit 200 through a signal holding unit 1, and the output terminal of the second transceiver circuit 200 is coupled to the first transceiver circuit 200 through a signal holding unit 1. The input terminal of the transceiver circuit 100.

[0046] In the relay circuit, the signal holding unit 1 may be a voltage follower, a signal holder, and other devices capable of maintaining a stable signal. In the relay circuit, the signal holding unit 1 can keep the digital signal output from the input terminal DI of the 485 chip U1 or the input terminal DI of the 485 chip U2 stable and improve the anti-interference performance.

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PUM

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Abstract

The invention discloses a relay circuit for half duplex communication. The relay circuit comprises a first transceiver circuit and a second transceiver circuit; and the first transceiver circuit comprises a first communication chip and a first switching device, the second transceiver circuit comprises a second communication chip and a second switching device, an output end of the first communication chip is coupled to an input end of the second communication chip, and the output end of the second communication chip is coupled to the input end of the first communication chip. The relay circuit for half duplex communication provided by the invention can be used on a long distance transmission bus to ensure the communication rate, as well as increasing the node number on the bus and reducing the distortion of data signals. The invention further discloses a half duplex communication circuit comprising at least one relay circuit for half duplex communication. According to the half duplex communication circuit provided by the invention, when the transmission baud rate of the data signals is constant, the transmission distance is increased.

Description

Technical field [0001] The invention relates to the technical field of half-duplex communication, in particular to a transceiver circuit, a relay circuit and a half-duplex communication line used for half-duplex communication. Background technique [0002] In industrial control occasions, RS485 bus is widely used because of its simple interface, convenient networking, and long transmission distance. Both RS485 interface and RS232 interface are communication interfaces based on serial ports, and the operation of data receiving and sending is the same, so the underlying driver of WinCE is also used. However, in actual applications, the two communication modes are quite different. The RS232 interface is a full-duplex data communication mode, while the RS485 interface is a half-duplex data communication mode, and the data can not be sent and received at the same time. If there is a conflict, it is necessary to switch the direction on the hardware, and correspondingly require the coo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/40H04L5/16
CPCH04B1/40H04L5/16
Inventor 宋宏伟袁平俞伟陈东亮
Owner ZHEJIANG FONDA CONTROL TECH
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