4Data Bit 2 13 Select
5Data Bit 3 14 Auto Linefeed*
6Data Bit 4 15 Error*
7Data Bit 5 16 Initialize Printer*
8Data Bit 6 17 Select In*
9Data Bit 7 18-25 Signal Ground
* = Active low
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Serial Connector
Connector Pin Signal
1
2
3
4
5
6
7
8
9
Carrier Detect
Receive Data
Transmit Data
Data Terminal Ready
Signal Ground
Data Set Ready
Ready to Send
Clear to Send
Ring Indicator
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Keyboard/Mouse
Connector Pin Signal