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4.1 Connector form serial COM-Ports
Pins from RS232 (V.24, ISO 2110):
Signal PC 9 Pol. Sub-D PC 25 Pol. Sub-D
TxD 3,O 2,O
RxD 2,I 3,I
RTS 7,O 4,O
CTS 8,I 5,I
DTR 4,O 20,O
DSR 6,I 6,I
DCD 1,I 8,I
Ring 9,I 22,I
GND 5 7
Earth Case Case
O = Output
I = Input

Cable PC 9Pol. - PC 9Pol.
Signal PC PC
  9 Pol. Sub-D 9 Pol. Sub-D
RxD 2
3
TxD 3
2
RTS 7
8
CTS 8
7
DTR 4
1,6
DSR 6
4
DCD 1
4
GND 5
5
Earth Case
Case
Ring 9 free 9

Cable PC 9Pol. - PC 25Pol.
Signal PC PC
  9 Pol. Sub-D 25 Pol. Sub-D
RxD 2
2
TxD 3
3
RTS 7
5
CTS 8
4
DTR 4
6,8
DSR 6
20
DCD 1
20
GND 5
7
Earth Case
Case
Ring 9 free 22

Extension cable are always 1:1 connected. There ale always all pins from connector connected.
The case from connector is always connected to the shield.


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