Wiring – Advantech 4-Port RS-232 Interface card PCL-849 User Manual
Page 27
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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 —