Industrial Modbus RTU 8 ch Relay Module, RS485 Bus, Multi Protection

Hardware Operation

Open the casing, hardware connection diagram:

Software Operation

Using Securecrt: (Download Link: https://www.waveshare.com/w/upload/b/b7/SecureCRT.7z)
Use SecureCRT to connect to the serial port, with the default settings of 115200 baud rate, N, 8, 1. Make sure not to select XONXOFF, and choose a Ymodem packet size of 1024 bytes.

Before powering on, short the SWDIO and GND pins to enter the bootloader program.
Once the bootloader program runs, the following interface will be displayed. The program starts with the LED constantly on, detecting the SWDIO pin. If shorted, it enters the bootloader program and the LED remains constantly on. If not shorted, it jumps to the user program, and the LED slowly blinks. If the user program fails to start, the LED will blink rapidly, indicating the need to re-download the user program.

When the above interface appears, select:

Here, we directly choose option 2 to Restore device default parameters.

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Modbus RTU IO 8CH Factory Reset Tutorial

Hardware Operation

Software Operation

Sipeed Maix Bit RISC-V AI+lOT K210 Development Board