The serial interface COM1 is connected to a removable 9-pin terminal block.
From firmware version V3.1 it is configurable for RS-232 or RS-485 (V3.0 RS-232 only).
Pin assignment (RS-485 / RS-232)
|
Pin |
Signal |
Interface |
Description |
||
|---|---|---|---|---|---|
 Terminal block removed |
 Terminal block inserted |
1 |
Terminator P |
RS-485 |
Terminator P |
|
2 |
RxD/TxD-P |
RS-485 |
Receive/Transmit, positive |
||
|
3 |
RxD/TxD-N |
RS-485 |
Receive/Transmit, negative |
||
|
4 |
Terminator 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) |
||
NOTICE
Unused connector!
Make sure that the terminal block is always connected to the terminal base or communication module, even if you do not use the interface.