A rs422 transceiver two-way monitoring circuit

A RS485, circuit technology, applied in the field of RS422 transceiver bidirectional monitoring circuit, can solve difficult fault points, increase the difficulty of troubleshooting, and achieve the effect of stable and effective operation and simplified circuit
CN103686156BActive Publication Date: 2015-08-19BEIJING JINGYI QIANGYUAN TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING JINGYI QIANGYUAN TECH
Publication Date
2015-08-19

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Abstract

The invention relates to a RS422 transmitting-receiving bidirectional monitoring circuit. The RS422 transmitting-receiving bidirectional monitoring circuit comprises transmitting-receiving chips U1-U4, and control triodes Q1 and Q2, wherein a pin A and a pin B of the U1 are connected to a positive end and a negative end of a signal transmitting party respectively; a pin RO of the U1 is connected to a pin DI of the U3; a pin RO of the U1 is connected to the base electrode of the Q1 through a current limiting resistor R1; the collector electrode of the Q1 is connected to a pin RE# and a pin DE of the U3; a pin A and a pin B of the U2 are connected to a positive end and a negative end of a signal receiving party; a pin RO of the U2 is connected to a pin DI of the U4; a pin RO of the U2 is connected to the base electrode of the Q2 through a current limiting resistor R2. According to the invention, a TTL (Transistor-Transistor Logic) signal is divided into two portions for treatment, one portion serves as a communication signal while the other portion forms a control signal for transmitting-receiving DEs (Decision Element) of the U3 and the U4 through a control circuit. The whole circuit is very simple, the operation is steady and efficient, the data in both the transmitting and receiving directions of a serial port are monitored at the same time, and communication of the monitored serial port is not affected.
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Description

technical field

[0001] The present invention designs a RS422 transceiver bidirectional monitoring circuit, which is an electronic circuit, and is a circuit capable of simultaneously monitoring the RS422 transceiver bidirectional direction without affecting the monitored serial port communication. Background technique

[0002] In order to ensure the safety of broadcasting, the digital TV broadcasting system usually sets up two sets of video broadcasting control systems, master and backup. In order to realize the switching between the main system and the backup system, it is necessary to add a switch between the main and backup systems. During normal broadcasting, the switcher will connect to the main control channel, so the main and standby video servers (including broadcasting online switcher, broadcasting video recorder and other equipment) are controlled by the main broadcasting The workstation communicates with the main broadcast control workstation through the core jump...

Claims

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