Train HDLC synchronous communication working mode

HDLC protocol is a common protocol for train communication. In order to reduce the number of signal lines, NRZI coding format is usually used.

The following diagram shows half-duplex HDLC communication based on RS-485 bus for train TCMS system or TMS system:

Some trains will also use RS-422 full-duplex mode, as shown in the following figure:

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HDLC-UART Isolate Embedded Module

Train Embedded Communication Module
2x RS-485/422 synchronous/asynchronous serial ports with isolation
1x TTL/CMOS synchronous and asynchronous serial port
All serial ports support synchronous HDLC protocol and asynchronous UART.
Realize HDLC, UART conversion each other
+5V power supply, 2.54mm pin interface

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For air traffic control, train, aerospace, industrial networks
+3.3V power supply, low power consumption embedded communication module
2x Ethernet 100M PHY interfaces
4x serial interfaces, support synchronous HDLC, asynchronous UART
Support NRZ, NRZI, DBPL, Manchester encoding
46.5 x 48 mm miniature size, 2.0mm pin interface

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