Description of serial port/CAN port
COM1 & COM2 support the RS485 protocol, while COM3 & COM4 support the RS232 protocol.
All serial ports are by default assigned to the real-time domain and currently do not support virtualization.

| COM1、COM2、COM3、COM4 PIN Assignments | ||
| 引脚 | RS-232 | RS-485 |
| Signal Name | Signal Name | |
| 1 | DCD | DATA- |
| 2 | RxD | DATA+ |
| 3 | TxD | NC |
| 4 | DTR | NC |
| 5 | GND | GND |
| 6 | DSR | NC |
| 7 | RST | NC |
| 8 | CTS | NC |
| 9 | RI | NC |