1: Different from the communication protocol selected when connecting other communication devices, the parameter settings are also different;

2. The serial port header is also different. Generally, 485 uses two signal lines to connect the serial port, 232 uses four signal lines, and grounding GND cannot be connected.

3. The serial port on the computer is generally 232. If you connect the 485 port of PLC, you need a serial converter. You can connect directly when practicing 232.