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Chapter 3 Wiring 19

Modem connections

PCL-741: DB-9 Male Modem (DCE)

Pin Signal Pin Signal

3 TxD 2 RxD

2 RxD 3 TxD

7 RTS 4 CTS

8 CTS 5 RTS

6 DSR 6 DTR

5 GND 7 GND

4 DTR 20 DSR

1 DCD 8 DCD

For DTE to DCE connection, use straight through cable connections,

i.e. you dont have to reverse lines 2 and 3, lines 4 and 5, and lines 6

and 20. Because in general DCE RS-232 interfaces are reversed

themselves.

Terminal without handshake

PCL-741: DB-9 MALE Terminal (DTE)

Pin Signal Pin Signal

3 TxD 3 RxD

2 RxD 2 TxD

7RTS

8 CTS

6 DSR

5 GND 7 GND

4 DTR

1 DCD

1 2 ... 18 19 20 21 22 23 24 25 26

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Advantech PCL-740 Spezifikationen Seite 23