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Parallel, TTP 2020
09/14/2009 TTP 2000 Technical Manual P1002902-002
Parallel, TTP 2020
The TTP 2020 parallel port is bi-directional and support Compatibility and
Reverse-Nibble modes.
Table 5 • Signal Names for the Parallel Port
Error Signaling
All errors that are not reset when status is read will set the nFault signal, for example:
• Head lifted
• Cutter not home
• Out of paper
This error also sets the Paper Out/End (PE) together with nFault:
• Out of paper
Note • If you intend to use any other mode than Compatibility Mode, we recommend you to
get the documents for the IEEE-1284 standards, and study them thoroughly.
Pin Host
IEEE1284-A
(D-Sub)
Direction
Pin Printer
IEEE1248-C
Compatible Signal
Names
Nibble and
Byte Mode
Signal
Names
1
Ö
15 nStrobe HostClk
2-9
Ö
6-13 Data Data
10
Õ
3 nAck PtrClk
11
Õ
1 Busy PtrBusy
12
Õ
5 PError AckDataReq
13
Õ
2 Select Xflag
14
Ö
17 nAutoFd HostBusy
15
Õ
4 nFault nDataAvail
16
Ö
14 nInit nInit
17
Ö
16 nSelectIn IEEE 1284 Active
18-25
GND
19-35 Ground Ground
ڙ
18 Host Logic High
└Õ
36 Peripheral Logic High
Note • Signal names starting with "n" are active LOW signals.
Note • The signaling of nFault and PE can be switched on/off with parameter p5.