5-6
Smartio
C168H/HS User’s Manual
Type 3:
To connect
Smartio
C168 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
Opt8A/S
Opt8A/S
DTE Device
DB25 Female
DB25 Male
RxD
2
2
TxD
TxD
3
3
RxD
GND
7
7
GND
RTS
5
4
RTS
CTS
4
5
CTS
DTR
20
6
DTR
DST
6
20
DSR
DCD
8
8
DCD
PC COM2 port, Serial Printer,
Terminal, or any DTE Device
Opt8B/C
Opt8B/C
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