Moxa Technologies user manual 5-6 C168P User’s Manual, Opt8A/S, DTE Device

Type 3: To connect C168P 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.

Opt8A/S

PC COM2 port, Serial Printer, Terminal, or any DTE Device

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

Opt8B/C

PC COM2 port, Serial Printer, Terminal, or any DTE Device

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

5-6C168P User’s Manual