Serial Interfaces¶
The serial interface connectors (COM1/COM2) have the following pin assignment:
Pin assignment of the serial interfaces
| 1 | Term. P | RS-485 | Terminator P |
| 2 | RxD/TxD-P | RS-485 | Receive/Transmit, positive |
| 3 | RxD/TxD-N | RS-485 | Receive/Transmit, negative |
| 4 | Term. N | RS-485 | Terminator N |
| 5 | RTS | RS-232 | Request to send (output) |
| 6 | TxD | RS-232 | Transmit Data (output) |
| 7 | SGND | Signal Ground | |
| 8 | RxD | RS-232 | Receive data (input) |
| 9 | CTS | RS-232 | Clear to send (input) |
| No. | Protocol | Description |
|---|---|---|
| COM1 | ||
| 1 | Online access | Online access for CODESYS via serial driver |
| 2 | Modbus | Modbus RTU, master or slave |
| 3 | ASCII | Any protocol with FB COM_SEND, COM_REC |
| 4 | SysLibCom | Support for blocks contained in the SysLibCom.lib library |
| 5 | Multi | Switch between two protocols (Online access, Modbus, ASCII, SysLibCom) using the block COM_SET_PROT |
| 6 | CS31 bus | CS31 bus master |
| 7 | RCOM/RCOM+ | ABB remote protocol RCOM or RCOM+ (only available as separate Communication Module CM574-RCOM) |
| COM2 | ||
| 1 | Online access | Online access for CODESYS with serial driver |
| 2 | Modbus | Modbus RTU, master or slave |
| 3 | ASCII | Any protocol with FB COM_SEND, COM_REC |
| 4 | SysLibCom | Support for SysLibCom.lib library blocks |
| 5 | Multi | Switch between two protocols (Online access, Modbus, ASCII, SysLibCom) using the block COM_SET_PROT |