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3 nAck/PtrClk 21 Printer C mode: Negative true = data
transfer acknowledge
N mode: Data qualifier
4 nFault/nDataAvail 22 Printer C mode: Negative true = printer
fault exists that prevents
printing
N mode: Negative low = data ready,
then data bits 0 then 4
5 PError/AckDataReq 23 Printer C mode: Positive true = printer error
exists, such as media tray
empty
N mode: Data bits 2 then 6
6 Data 1 24 Host C mode: Positive true data input
N mode: Not used
7 Data 2 25 Host C mode: Positive true data input
N mode: Not used
8 Data 3 26 Host C mode: Positive true data input
N mode: Not used
9 Data 4 27 Host C mode: Positive true data input
N mode: Not used
10 Data 5 28 Host C mode: Positive true data input
N mode: Not used
11 Data 6 29 Host C mode: Positive true data input
N mode: Not used
12 Data 7 30 Host C mode: Positive true data input
N mode: Not used
13 Data 8 31 Host C mode: Positive true data input
N mode: Not used
Parallel port signal descriptions (cont'd.)
Pin Signal mode names:
Compatibility/Nibble
Return
pin
Signal
source
Description