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RS-485 automatic transceiver circuit

An RS-485, automatic transceiver technology, applied in the circuit field, to achieve the effect of convenient control, low price, saving IO ports and program control process

Inactive Publication Date: 2017-07-25
HAIER YOUJIA INTELLIGENT TECH BEIJING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems described above

Method used

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  • RS-485 automatic transceiver circuit
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  • RS-485 automatic transceiver circuit

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] figure 1 It is a schematic diagram showing an RS-485 automatic transceiver circuit provided according to Embodiment 1 of the present invention. refer to figure 1 , the RS-485 automatic transceiver circuit includes:

[0025] RS-485 communication chip 101, the first circuit 102 and the second circuit 103; Wherein, the transmission signal receiving end (DI) of RS-485 communication chip 101 is grounded; The first circuit 102 is used for carrying out inversion output to the signal of signal input end , the signal output end of the first circuit 102 is connected with the signal sending enabling end (DE) and the signal receiving enabling end (RE) of the RS-485 communication chip 101; The pull-up resistor R5 connected to the A terminal of the RS-485 communication chip 101, and the pull-down resistor R4 connected to the B terminal of the RS-485 communication chip 101.

[0026] The above-mentioned first circuit 102 includes a first resistor R2, a second resistor R3 and an NPN ...

Embodiment 2

[0035] Figure 4 It is a schematic diagram showing an RS-485 automatic transceiver circuit provided according to Embodiment 2 of the present invention, which can be regarded as figure 1A specific implementation of the illustrated embodiment.

[0036] refer to Figure 4 , RS-485 automatic transceiver circuit comprises RS-485 communication chip U1, the first circuit and the second circuit; Wherein, the sending signal receiving terminal (DI) of RS-485 communication chip U1 is grounded; The signal output terminal of the first circuit is connected with RS The signal transmission enabling end (DE) of the -485 communication chip U1 and the signal receiving enabling end (RE) are all connected; the second circuit 103 includes a pull-up resistor R5 connected to the A end of the RS-485 communication chip U1 , a pull-down resistor R4 connected to terminal B of the RS-485 communication chip U1.

[0037] Preferably, the model of the RS-485 communication chip U1 is SP3485, and the resista...

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Abstract

The present invention discloses an RS-485 automatic transceiver circuit. The RS-485 automatic transceiver circuit comprises an RS-485 communication chip, a first circuit and a second circuit. The transmission signal receiving terminal of the RS-485 communication chip is grounded; the first circuit is used to carry out inverted output on the signal of the signal input terminal, and the signal output end of the first circuit is connected with the signal transmission enable terminal and the signal receiving enable terminal of the RS-485 communication chip; and the second circuit comprises a pull-up resistor connected with the A terminal of the RS-485 communication chip and a pull-down resistor connected with the B terminal of the RS-485 communication chip. According to the RS-485 automatic transceiver circuit provided by the present invention, the automatic transceiver function of the RS-485 communication chip can be realized, and when transmitting or receiving data, the RS-485 chip transceiver mode does not need to be controlled separately, so that the IO port and program controlling process of the controller is saved, and IO port resources of the controller are saved.

Description

technical field [0001] The invention relates to the technical field of circuits, in particular to an RS-485 automatic transceiver circuit. Background technique [0002] RS-485 is a standard defining the electrical characteristics of drivers and receivers in a balanced digital multipoint system, defined by the Telecommunications Industry Association and the Electronic Industries Alliance. Digital communication networks using this standard can transmit signals efficiently over long distances and in electronically noisy environments. RS-485 enables the configuration of inexpensive local networks as well as multi-drop communication links. [0003] RS485 bus, when the communication distance is required to be tens of meters to thousands of meters, the RS-485 serial bus standard is widely used. RS-485 uses balanced transmission and differential reception, so it has the ability to suppress common mode interference. In addition, the bus transceiver has high sensitivity and can det...

Claims

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Application Information

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IPC IPC(8): G06F13/40G06F13/42
CPCG06F13/4072G06F13/4282G06F2213/0002
Inventor 张威马宇来尹德帅
Owner HAIER YOUJIA INTELLIGENT TECH BEIJING CO LTD