Serial Interfaces
The serial interface connectors (COM1/COM2) have the following pin assignment:
| Pin |
Signal |
Interface |
Description |
|---|
| 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 |
Signal Ground |
| 8 |
RxD |
RS-232 |
Receive data (input) |
| 9 |
CTS |
RS-232 |
Clear to send (input) |
Protocols:
| No. |
Protocol |
Description |
|---|
| COM1 |
| 1 |
Online access |
Online access for IEC 61131-3 programming 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 IEC 61131-3 programming 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 |
