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Wiring – Advantech 4-Port RS-232 Interface card PCL-849 User Manual

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PCL-849 User's Manual

Modem connections

DB-25 Male: PCL-849

Modem (DCE)

Pin

Signal

Pin

Signal

2

TxD

2

RxD

3

RxD

3

TxD

4

RTS

4

CTS

5

CTS

5

RTS

6

DSR

6

DTR

7

GND

7

GND

20

DTR

20

DSR

8

DCD

8

DCD

For DTE to DCE connections, use straight through cable (i.e., you
don't have to reverse lines 2 and 3, lines 4 and 5, and lines 6 and 20
since, in general, the DCE RS-232 interfaces are reversed them-
selves).

Terminal without handshake

DB-25 Male: PCL-849

Terminal, PC (DTE)

Pin

Signal

Pin

Signal

2

TxD

3

RxD

3

RxD

2

TxD

4

RTS —

5

CTS —

7

GND

7

GND

6

DSR —

20

DTR —

8

DCD —