Chapter 3
Hardware
LittleBoard 735
Reference Manual
21
Parallel Port Interface
Parallel port supports standard parallel, Bi-directional, ECP and EPP protocols. The SCH3114I-NU chip
(U15) provides separate parallel port interface signals.
The parallel header uses 26 pins, 2 rows, odd/even sequence (1, 2), with 0.100" pitch.
Note:
The shaded areas denote power or ground. The signals marked with * = Negative true logic.
Table 3-4. Parallel Interface Pin Signals (J16)
Pin # Signal
In/Out Description
1
Strobe*
Out
Strobe* – This is an output signal used to strobe data into the printer.
I/O pin in ECP/EPP mode.
2
AFD*
Out
Auto Feed* – This is a request signal into the printer to automatically
feed one line after each line is printed.
3
PD0
I/O
Parallel Port Data 0 – These pins (0 to 7) provide parallel port data.
4
ERR*
Out
Error* – This is a status output signal from the printer. A Low State
indicates an error condition on the printer.
5
PD1
I/O
Parallel Port Data 1 – Refer to pin-3 for more information.
6
INIT*
Out
Initialize* – This signal used to Initialize printer. Output in standard
Mode, I/O in ECP/EPP mode.
7
PD2
I/O
Parallel Port Data 2 – Refer to pin-3 for more information.
8
SLIN
Out
Select In – This output signal is used to select the printer. I/O pin in
ECP/EPP mode.
9
PD3
I/O
Parallel Port Data 3 – Refer to pin-3 for more information.
10,
12
GND
Ground
11
PD4
I/O
Parallel Port Data 4 – Refer to pin-3 for more information.
13
PD5
I/O
Parallel Port Data 5 – Refer to pin-3 for more information.
14,
16
GND
Ground
15
PD6
I/O
Parallel Port Data 6 – Refer to pin-3 for more information.
17
PD7
I/O
Parallel Port Data 7 – Refer to pin-3 for more information.
18,
20
GND
Ground
19
ACK*
In
Acknowledge* – This printer output status indicates it has received
the data and is ready to accept new data if the signal state is Low.
21
BUSY
In
Busy – This printer output status indicates the printer is not ready to
accept data if the signal state is High.
22,
24
GND
Ground
23
PE
In
Paper End – The printer output status indicates the printer is out of
paper if the signal state is High.
25
SLCT
In
Select – This printer output status indicates the printer is selected and
powered on if the signal state is High.
26
Key/NC
Key - Not connected
Summary of Contents for LittleBoard 735
Page 1: ...LittleBoard 735 Single Board Computer Reference Manual P N 50 1Z020 1000 ...
Page 6: ...Contents vi Reference Manual LittleBoard 735 ...
Page 46: ...Chapter 3 Hardware 40 Reference Manual LittleBoard 735 ...
Page 50: ...Chapter 4 BIOS Setup 44 Reference Manual LittleBoard 735 ...
Page 52: ...Appendix A Technical Support 46 Reference Manual LittleBoard 735 ...
