Serial interface COM1ΒΆ
The serial non-isolated COM1 interfaces provides communication via RS-485 and is carried out as a 9-pin Sub-D jack. The COM1 interface can be used
- for online connection with the PS501 Control Builder Software (via a RS-485 programming cable. e. g. TK503 TK503 - Programming Cable)
- as Modbus RTU (master and slave)
- for ASCII serial protocols
- as CS31 system bus (master only).
Note
COM1 does not support communication via RS-232. The programming cable TK501 cannot be used.
The pin assignment of the serial interface COM1:
| 1 | FE | Functional earth | |
| 2 | SGND | 0 V power supply, internally connected to M terminal | |
| 3 | RxD/TxD-P | Receive/Transmit positive | |
| 4 | Reserved | Reserved, not connected | |
| 5 | SGND | 0 V power supply, internally connected to M terminal | |
| 6 | +3.3 V | 3.3 V power supply - see caution notice below | |
| 7 | Reserved | Reserved, not connected | |
| 8 | RxD/TxD-N | Receive/Transmit negative | |
| 9 | Reserved | Reserved, not connected | |
| Shield | Cable shield | Functional earth |
Caution
:strong:Risk of damaging the PLC modules!
The CPU can be damaged by overvoltages and short circuits.
The internal power supply voltage which is connected to pin 6 of the D-SUB connector must not be short-circuited or connected to any other voltages.
Note
The Serial RS485 Interface is not electrically isolated.