The module and serial board can be connected as shown as above:
Module 1 pin is connected to serial board 5V
Module 2 pin is connected to serial board GND
Module 3 pin is connected to serial board TX module
Module 4 pin is connected to serial board RX
5.Debug configuration
The HLK-LD1125H-24G can be debugged and tested on the computer through the serial port
assistant.
Use any serial debugging tool. The baud rate is 115200, 8 data bits, 1 stop bit, check bit and
flow control are None, select ASCII for receive settings, and select ASCII for send settings.
Product supports UART text protocol