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The corresponding relationship between interface and port is as follows:
4-wire
interface
Correspondin
g port
4-wire sequence
5-(From top to bottom)
TTL
COM1
pin1-3.3V
，
pin 2-GND
，
pin 3-TXD
，
pin 4-RXD
RS232
COM2
pin1-3.3V
，
pin 2-GND
，
pin 3-TXD
，
pin 4-RXD
RS485
COM3
pin1-3.3V
，
pin 2-GND
，
pin 3-A
，
pin 4-B
RS422
COM3
pin1-3.3V
，
pin 2-GND
，
pin 3-Z
，
pin 4-Y
DC5V
DC5V
pin1-TX1+
，
pin 2-TX1+
，
pin 3-TX2-
，
pin 4-TX2-
Debug
Debug port
pin1-3.3V
，
pin 2-GND
，
pin 3-SWDIO
，
pin 4-SWCLK
Note:
For RS422, please use it with RS485 interface A and B, and configure the
motherboard BOIS as 422.
If you need to use Debug debug port, please use it under the guidance of customer service
personnel.
Set COM3 as RS422 interface
The remote control COM3 default is RS485 interface, if you need to use RS422 interface,
you need to set it in the BIOS interface.
1. Prepare a keyboard to connect the USB interface, restart the system.
2. Press the Delete key to enter the BIOS interface.
