IBM EasyCoder 3400e User Manual
Page 101
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39
Specifications
A-7
A
The following pin descriptions are for the printer’s parallel interface connector:
Signal
Pin
Return
Direction
Description
DATASTB
1
19
IN
Negative pulse. Latches DB0-7 on the rising edge. Eight bits
in parallel provide data input. High is logical 1 and LOW is
logical 0.
DB0
2
20
IN
DB1
3
21
IN
DB2
4
22
IN
DB3
5
23
IN
DB4
6
24
IN
DB5
7
25
IN
DB6
8
26
IN
DB7
9
27
IN
ACK
10
28
OUT
Negative pulse. Data has been received.
BUSY
11
29
OUT
If HIGH, printer cannot receive data.
PE
12
30
OUT
If HIGH, out of ribbon or media.
SELECT
13
-
OUT
Pulled to +5V. Printer is on.
CHASSIS GND
17
-
-
Printer's chassis gnd isolated from logic gnd.
INIT
31
16
IN
Clears I/OINT0 latch.
FAULT
32
33
OUT
See printer display.
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