Terminal/Printer Cables, DB-9 to DB-25

The wiring diagram for a DB-9 to DB-25 terminal/printer cable is shown in Table 1.

Table 1:  EIA-232 DB-9 to DB-25 terminal/printer cable

DB-9	Signal	Direction	Signal	To DB-25
2	RxD		TxD	2
3	TxD		RxD	3
4	DTR		DSR	6
			DCD	8
5	SG		SG	7
6	DSR		RTS	4
1	DCD
7	RTS		CTS	5
8	CTS		DTR	20
Shell	GND		GND	Shell

NOTES:

• Altpin should be turned off when using this cable.
• 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/EIA486 specifications, click here.