Terminal/Printer Cables, RJ-45 8-pin to DB-9

The wiring diagram for an RJ-45 8-pin to DB-9 terminal/printer cable is shown in Table 1.

Table 1:  EIA-232 altpin RJ-45 8-pin to DB-9 terminal/printer cable

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

NOTES:

• Altpin should be turned off when using this cable so that pin 1 becomes DSR instead of DCD.  This alternative can be used if DCD is not required, and DSR is needed instead.
• This cable utilizes the DTR signal of the terminal/printer 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.