Tektronix Phaser 540 Plus, User Manual

Page: 161 / 196

Technical Notes
A
User Manual
A-11
The table shows the parallel port’s connected pins. Other pins are not
connected.
Parallel port signal descriptions
Pin Signal mode names:
Compatibility/Nibble Return
pin Signal
source Description
1 Busy/PtrBusy 19 Printer C mode:
N mode:
Positive true = not ready
for data
Data bits 3 then 7, then
busy status
2 Select/Xflag 20 Printer C mode:
N mode:
Positive true = online
Data bits 1 then 5
3 nAck/PtrClk 21 Printer C mode:
N mode:
Negative true = data
transfer acknowledge
Data qualifier
4
nFault/nDataAvail
22 Printer C mode:
N mode:
Negative true = printer
fault exists that prevents
printing
Negative low = data ready
then data bits 0 then 4
5 PError/AckDataReq 23 Printer C mode:
N mode:
Positive true = printer
error exists, such as
media tray empty
Data bits 2 then 6
6 Data 1 24 Host C mode:
N mode:
Positive true data input
Not used
7 Data 2 25 Host C mode:
N mode:
Positive true data input
Not used
8 Data 3 26 Host C mode:
N mode:
Positive true data input
Not used
9 Data 4 27 Host C mode:
N mode:
Positive true data input
Not used
10 Data 5 28 Host C mode:
N mode:
Positive true data input
Not used