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APPENDIX
These signals represent information for the 1st
through 8th bit of parallel data, respectively. Each
signal is HIGH when data is logical 1, and LOW
when logical 0.
Parallel Interface
Connector Signals
Pin
Name
Function
1
STROBE
Goes low for
≥
0.5
µ
s when active.
2
DATA0
3
DATA1
4
DATA2
5
DATA3
6
DATA4
7
DATA5
8
DATA6
9
DATA7
10
ACK
10
µ
s low to acknowledge receipt of data.
11
BUSY
Printer sets line low when ready to receive data.
12
PAPER
High when paper runs out.
13
SELECT
High when printer is on-line.
14
AFXT
This signal is used when the mode is nibble mode.
15
Not used.
16
SIGNAL GND
Signal ground
17
CHASSIS
Chassis ground (isolated from signal ground)
18
+5V
+5V DC output from printer
19~30
GND
Twisted pair ground return
31
RESET
Printer is reset when this signal goes low.
32
ERROR
Low when printing cannot continue due to error.
33
EXT GND
External ground
34~35
Not used
36
SELECT IN
This signal is used when the mode is nibble mode.