Data stream controlling network serial communication bus
A serial port communication and control network technology, applied in the direction of electrical digital data processing, transmission system, electrical components, etc., can solve the problems of high error rate and increase cost, and achieve the effect of improving reliability and simplifying software control design
Inactive Publication Date: 2006-07-12
丹东华通测控有限公司
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Problems solved by technology
In order to solve this technical problem, some instrument manufacturers set the control pin to low level during the initialization process of the single-chip microcomputer to be in the receiving state, but it is still impossible to avoid the disorder of the control state caused by the failure of the single-chip microcomputer itself; another solution It is a communication device of industrial control network, adding isolation components to its receiving, sending and control pins, and using an independent power supply. This method increases the cost and high error rate
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[0008] The data flow control network serial port communication bus of the present invention, as shown in the figure, realizes data reception and transmission by two data lines RXD and TXD between the serial interface chip 1 of its semi-duplex RS485 network and the single-chip microcomputer, wherein the data transmission The line TXD leads out, and is connected to the control terminal DE of the serial interface chip through the inverter D. There is a TXD inverting signal line, and the inverter D can be a 74 series inverter, or a single logic inverting triode. Such as image 3 As shown, there are isolated photocoupler tubes D1 and D2 between the serial interface chip and the serial data line of the microcontroller, and the isolated TXD line leads to the inverter D circuit.
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The invention discloses a network serial port communication control bus of data flow path, which is characterized by the following: drawing single-chip set TXD data line in the semi-double-power RS 485 network; connecting the inverter with the control end of serial interface chip; adapting the logic relationship of RXD and TXD data line to reach the goal of receiving or sending the control conversion directly through TXD inversed signal to confine the control end of serial interface chip. The invention improves the network reliability greatly in the single serial port and multiple serial port system, which transmits 232 interface into 485 interface converter and RX 485 repeater.
Description
technical field [0001] The invention relates to the control technology of the receiving state of the single-chip network communication serial interface bus. Background technique [0002] The most common implementation method of multi-protocol serial port communication for intelligent instruments and meters and intelligent modules with single-chip microcomputer as the core is RS485 network bus. Among the network nodes on the serial interface network bus, only one network node is allowed to be in the sending state of the transmitter, and the rest are in the receiving state, so most of the RS485 network communication is realized by half-duplex mode, such as figure 1 As shown, if an independent pin of the single-chip microcomputer is used as the control pin CTRL to realize the above-mentioned sending and receiving conversion, if the single-chip microcomputer control error or a node in the network fails, when the control pin CTRL is placed in the sending control state, it will I...
Claims
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IPC IPC(8): G06F13/40H04L29/10
Inventor 刘永胜
Owner 丹东华通测控有限公司