Serial printer connector pinout and signals

DB25 pin D-SUB male (at the printer)

Pin	Name	Direction	Description
1	SHIELD		Shield Ground
2	TXD	→	Transmit Data
3	RXD	←	Receive Data
4	n/c	-	Not connected
5	n/c	-	Not connected
6	DSR	←	Data Set Ready
7	GND		System Ground
8	DCD	←	Data Carrier Detect
9	n/c	-	Not connected
10	n/c	-	Not connected
11	?	→	Reverse Channel
12	n/c	-	Not connected
13	n/c	-	Not connected
14	n/c	-	Not connected
15	n/c	-	Not connected
16	n/c	-	Not connected
17	TTY-TXD	→	TTY Receive Data
18	n/c	-	Not connected
19	n/c	-	Not connected
20	DTR	→	Data Terminal Ready
21	n/c	-	Not connected
22	n/c	-	Not connected
23	?	→	TTY Receive Data Return
24	?	←	TTY Transmit Data Return
25	TTY-RXD	←	TTY Receive Data

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