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Automatic stream control device, control method and circuit comprising the device and RS-485 interface chip

A technology of RS-485 and flow direction control, applied in the direction of automatic switching office, telephone communication, electrical components, etc., can solve the problems of increasing cost, increasing microprocessor, hardware circuit and debugging complexity, etc., to reduce the cost of software and hardware, The hardware circuit is simple and the effect of reducing software overhead

Inactive Publication Date: 2010-05-12
BEIJING RUISAIDE ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method increases the cost due to the increase of the microprocessor, and complicates the hardware circuit and debugging

Method used

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  • Automatic stream control device, control method and circuit comprising the device and RS-485 interface chip
  • Automatic stream control device, control method and circuit comprising the device and RS-485 interface chip
  • Automatic stream control device, control method and circuit comprising the device and RS-485 interface chip

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0022] Such as figure 1 It shows the connection relationship between the automatic flow control device and the RS-485 interface chip. Wherein, in the uplink signal transmission, the output terminal RO of the RS-485 interface chip is used to output the uplink signal from the bus. In the downlink signal transmission, the input terminal DI of the RS-485 interface chip is used to receive the downlink signal to send to the bus; at the same time, the automatic flow direction control circuit also receives the signal sent to the input terminal DI of the RS-485 interface chip, and Signal analysis and processing generates a control level signal and sends it to the receiving enable terminal / RE and sending enable terminal DE of the RS-485 interface chip to complete the automatic flow control of the RS-485 interface chip and realize the download of RS-485 data reception of dat...

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PUM

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Abstract

First input end of NAND Schmidt trigger receives input signal. After being connected to charging delay circuit in series, second input end is connected to the first input end. Output end of the NAND Schmidt trigger is in use for outputting control signal. The invention also discloses method for controlling flow direction automatically including following steps: in idle period of transmission, input signal keeps high level, automatic flow direction control device (AFDCD) outputs low level; when the input signal inputs a low level, AFDCD outputs high level instantly; when the input signal jumpsto high level from low level, AFDCD maintains high output level for momentary time; after the momentary time, AFDCD outputs low level. Baud rate of the disclosed AFDCD is 300-115200bps self-adapted. Based on input signal, the invention can control flow direction of RS-485 / 422 interface chip automatically.

Description

technical field [0001] The invention relates to a serial port converter and a signal conversion method, in particular to an automatic flow direction control device in an RS-485 / 422 interface, a control method and a circuit including the device and an RS-485 interface chip. Background technique [0002] RS-422 and RS-485 are serial data interface standards. Among them, both RS-422 and RS-485 can support multiple nodes, so they can form a bus-type network. When building a network by RS-485 / 422, multiple RS-485 / 422 devices are connected in parallel on the bus for communication. The network formed by RS-485 / 422 can be widely used in process control system, remote data acquisition system, security system, community access control system, intelligent building, laboratory automation and other fields. [0003] For the RS-422 network, it is a full-duplex mode, there is only one master (Master) on the bus, and the others are slaves. When the master sends data to the bus, the slaves...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/44H04B1/58G06F3/00H04M3/00H04L29/10
Inventor 徐震白伟魏村国
Owner BEIJING RUISAIDE ELECTRONICS TECH