Serial Interface COM1¶
The serial interface COM1 can be used for:
- Online access (RS-232 programming interface for Automation Builder)
- Free protocol
- Modbus RTU, client and server
- CS31 system bus (RS-485), as master only
Serial interface COM1 of the Terminal Bases (PM57x, PM58x, PM59x).
| Serial Interface | Pin | ||||
|---|---|---|---|---|---|
| 1 | FE | Functional earth | |||
| 2 | TxD | RS-232 | Transmit data | Output | |
| 3 | RxD/TxD-P | RS-485 | Receive/Transmit | Positive | |
| 4 | RTS | RS-232 | Request to send | Output | |
| 5 | SGND | Signal ground | 0 V supply out | ||
| 6 | +5 V | 5 V supply out | |||
| 7 | RxD | RS-232 | Receive data | Input | |
| 8 | RxD/TxD-N | RS-485 | Receive/Transmit | Negative | |
| 9 | CTS | RS-232 | Clear to send | Input | |
| Shield | FE | Functional earth |
Attention
:strong:Risk of corrosion!
Unused connectors and slots may corrode, if using XC devices in salt mist environments.
Protect unused connectors and slots with TA535 protective caps for XC devices TA535: Protective Caps TA535 for XC Devices Protective Caps TA535 for XC Devices.