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

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

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

From  DB-25	Signal	Direction	Signal	To DB-25
6	DSR		RTS	4
8	DCD
3	RxD		TxD	2
2	TxD		RxD	3
20	DTR		DSR	6
			DCD	8
7	SG		SG	7
4	RTS		CTS	5
5	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).
• Okidata printers may use SSD (pin 11) instead of DTR (pin 20) on Term/Prn DB25 side of above diagram.  If this is the case, the printer should be set to SSD+.
• 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.