63
MODULAR SMART SWITCH
Table B-1. DB25 Parallel Connector Pinouts.
Pin
Name
Input from Computer Output to Printer
1
STROBE
INPUT
OUTPUT
2-9
DATA 0 to 7
INPUT
OUTPUT
10
ACKNOWLEDGE
OUTPUT
no connection
11
BUSY
OUTPUT
INPUT
12
PAPER END
OUTPUT low
no connection
13
SELECT
OUTPUT high
no connection
14
AUTOFEED XT
no connection
no connection
15
ERROR
OUTPUT high
no connection
16
INIT
no connection
OUTPUT high
17
SELECT IN
no connection
OUTPUT low
18-25
SIGNAL GROUND
ground
ground
The cables need to have a DB25 connector for connecting to the Modular
Smart Switch. If possible, the length should be kept below 22.9 ft. (7 m) to
reduce interference.
62
MODULAR SMART SWITCH
Appendix B: Parallel Ports
B.1 Parallel Pin Assignments
Each parallel port uses a DB25 socket connector, similar to the one on an
IBM PC, PC/XT, or AT.
Figure B-1
shows the pin numbers as viewed from
the rear of the Modular Smart Switch.
Figure B-1. DB25 Parallel Connector.
13
25
1
14