EIA-232 Modem Cables, Altpin RJ-45 8-pin to DB-25

The wiring diagram for a Altpin RJ-45 8-pin to DB-25 modem cable is shown in Table 1.

Table 1:  EIA-232 Altpin RJ-45 8-pin to DB-25 modem cable

From RJ-45	Signal	Direction	Signal	To DB-25
1	DCD		DCD	8
5	RxD		RxD	3
4	TxD		TxD	2
8	DTR		DTR	20
6	SG		SG	7
2	RTS		RTS	4
7	CTS		CTS	5
3	GND		GND	Shell

NOTES:

• Altpin should be turned on when using this cable.
• This cable utilizes the CTS signal of the modem for hardware flow control (RTS/CTS).
• EIA-232 cables cannot exceed 2500pF.  For information about calculating capacitance of your cable, click here.
• For information regarding the EIA-232/EIA-422/EIA485 specifications, click here.