Parallel Interface
Connector and Icon
Pin
Signal
1
Strobe
2
Data Bit 0
3
Data Bit 1
4
Data Bit 2
5
Data Bit 3
6
Data Bit 4
7
Data Bit 5
8
Data Bit 6
9
Data Bit 7
Serial Interface, Powered and Non-Powered
Connector and Icon
214 Appendix A Connector Pin Assignments
Pin
Signal
10
Acknowledge
11
Busy
12
Paper End
13
Select
14
Auto Linefeed
15
Error
16
Initialize Printer
17
Select IN
18–25
Signal Ground
Pin
Signal
1
Carrier Detect (12V if powered)
2
Receive Data
3
Transmit Data
4
Data Terminal Ready
5
Signal Ground
6
Data Set Ready
7
Request to Send
8
Clear to Send
9
Ring Indicator (5V if powered)