EIA-232 Modem Cables RJ-45 10-pin to DB-9

The wiring diagram for an RJ-45 10-pin to DB-9 modem cable is shown in Table 1. 

Table 1:  EIA-232 RJ-45 10-pin to DB-9 modem cable

From RJ-45	Signal	Direction	Signal	To DB-9
10	DCD		DCD	1
6	RxD		RxD	2
5	TxD		TxD	3
9	DTR		DTR	4
7	SG		SG	5
2	DSR		DSR	6
3	RTS		RTS	7
8	CTS		CTS	8
1	RI		RI	9
4	GND		GND	Shell

These cables can also be purchased from Digi (See part numbers below).

• 2' RJ-45 10-pin to DB-9 Pin   - Part #76000239

• 4' RJ-45 10-ping to DB-9 Pin - Part #76000240

NOTES:

• Altpin should be turned off 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.