Based on long-range serial communications, serial port only as short-distance communication, but many need to use serial communication and the distance is longer, according to a lot of inconvenience, so here come up with a long-distance serial communication method.

长距离串口通信\234014zooq8dczu6leu4qc.jpg
..............\L293D_STMICROELECTRONICS.pdf
..............\TLP521-4中文资料.pdf
..............\long_line.pdf
长距离串口通信

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