Moxa Technologies C104H/PCI Series - Manual (Page 52)

5-4 Smartio C104H/PCI Series User’s Manual
Modem
or any DCE Device
Opt4D
C104H/PCI DCE Device
DB9 Male DB25 Female
RxD 2 2 RxD
TxD 3 3 TxD
CTS 8 4 CTS
RTS 7 5 RTS
DTR 4 6 DTR
DSR 6 20 DSR
GND 5 7 GND
DCD 1 8 DCD
Type 3: To connect C104H/PCI Series to a DTE with 3-pin wiring.
If the Hardware flow control feature is set to ON, you must loop back (or short)
the RTS with CTS and DSR with DTR, DCD on MOXA site, indicated in dash-
lines of the following diagrams. If the Hardware flow control feature is set to OFF,
you could just leave RTS, CTS, DSR, DTR, DCD open, ignoring the connection
indicated in dash-lines.
PC COM2 port, Serial Printer,
Terminal, or any DTE Device
Opt4C
C104H/PCI DTE Device
DB25 Male DB25 Male
TxD 2 2 TxD
RxD 3 3 RxD
GND 7 7 GND
RTS 4 4 RTS
CTS 5 5 CTS
DSR 6 6 DTR
DTR 20 20 DSR
DCD 8 8 DCD