The GW102 gateway provides two RS485 communication serial ports, COM1 and COM2, both of which are electrically isolated design.
The physical drawing of the interface is as follows
Each RS485 serial port has three terminals. The silkscreen instructions are as follows:
COM1 serial port signal
Linux device name is /dev/ttymxc3
| Shell Silk Name | Description |
|---|---|
| A | COM1 RS485-A |
| B | COM1 RS485-B |
| G | COM1 RS485 GND |
COM2 serial port signal
Linux device name is /dev/ttymxc5
| Shell Silk Name | Description |
|---|---|
| A | COM2 RS485-A |
| B | COM2 RS485-B |
| G | COM2 RS485 GND |