|
Pin
|
Signal mode names:
Compatibility/Nibble
|
Return
pin
|
Signal source
|
Description
|
|---|
|
1
|
Busy/PtrBusy
|
19
|
Printer
|
C mode: Positive true = not ready for data
N mode: Data bits 3 then 7, then busy status
|
|
2
|
Select/Xflag
|
20
|
Printer
|
C mode: Positive true = online
N mode: Data bits 1 then 5
|
|
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
|
|
14
|
nInit/nHostRTS
|
32
|
Host
|
C mode: Negative true = reset interface
N mode: Set positive
|
|
15
|
nStrobe/HostClk
|
33
|
Host
|
C mode: Negative true = transfer data into printer input latch on rising edge
N mode: Negative true = transfer Extensibility Request value into printer input latch on rising edge
|
|
16
|
nSelectIn/1284 Active
|
34
|
Host
|
C mode: Negative true = select printer
N mode: Used in conjunction with HostBusy for 1284 hardware handshaking
|
|
17
|
nAutoFd/HostBusy
|
35
|
Host
|
C mode: Not used
N mode: Used in conjunction with 1284 Active for 1284 hardware handshaking
|
|
18
|
Host Logic High
|
|
Host
|
Positive true = host signals valid
Negative true = host signals invalid
|
|
36
|
Peripheral Logic High
|
|
Printer
|
Positive true = printer on
Negative true = printer off
|
