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Pin assignments
The following table lists the signals and input/output status of the pin
assignments used for parallel communication.
No. Signal
1
STROBE
2
DATA 1
3
DATA 2
4
DATA 3
5
DATA 4
6
DATA 5
7
DATA 6
8
DATA 7
9
DATA 8
10 ACKNLG
11 BUSY
12 PAPER END
13 SELECT
14 AUTO FEED XT
15 NO CONNECTION
16 GND
17 FG
18 NO CONNECTION
1
All-RETs are connected to GND.
2
These signals are valid only in Epson LQ printer control mode.
3
The level is raised to +5.0V at 5.6k.
Each signal is defined as follows:
STROBE
When the printer receives the STROBE low pulse with a width greater
than one second from the computer, it reads the data from the interface
and sets the BUSY line high.
I/O
No. Signal
IN
19 STROBE-OUT
IN
20 DATA 1-RET
IN
21 DATA 2-RET
IN
22 DATA 3-RET
IN
23 DATA 4-RET
IN
24 DATA 5-RET
IN
25 DATA 6-RET
IN
26 DATA 7-RET
IN
27 DATA 8-RET
OUT 28 ACKNLG-RET
OUT 29 BUSY-RET
OUT 30 PAPER END-RET
OUT 31 INIT
2
32 ERROR
33 GND
34 NO CONNECTION
35 +5.0V
36 SELECT IN
I/O
1
IN
OUT
3
2
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