Parallel Port Pin Signals - Tektronix Phaser 600 User Manual

Parallel port pin signals

This table shows the parallel port's connected pins; other pins are not connected.
Parallel port signals
Pin Signal mode names:
Compatibility/Nibble
1 Busy/PtrBusy
2 Select/Xflag
3 nAck/PtrClk
4 nFault/nDataAvail
5 PError/AckDataReq
Return Signal Description
pin source
19 Printer C mode: Positive true = not ready for data
N mode: Data bits 3 then 7, then busy
status
20 Printer C mode: Positive true = online
N mode: Data bits 1 then 5
21 Printer C mode: Negative true = data transfer
acknowledge
N mode: Data qualifier
22 Printer C mode: Negative true = printer fault exists
that prevents printing
N mode: Negative low = data ready, then
data bits 0 then 4
23 Printer C mode: Positive true = printer error exists,
such as media tray empty
N mode: Data bits 2 then 6
5 1 0
P
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