Very good serial tool, you can debug modbus protocol, automatic calculation of CRC, LRC.

AT命令串发送模板.txt
ECOM串口助手使用说明书.txt
ecom 使用说明.jpg
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ecom.jpg
命令串发送模板.txt
ecom-Xmodem.jpg
ECOM串口助手V2.80使用说明书.pdf
ECOM串口助手 V2.80.exe

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