BayTech 24SII Owner's Manual page 35

The pin assignment for the DB-25 connector is similar to the IBM PC
parallel connector and uses the following signals for communication:
DB-25 STANDARD CENTRONICS TTL LEVELS
PIN #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18-25
BayTech Cable part # MC25S010
SIGNAL
- Strobe
+Data Bit 0
+ Data Bit 1
+ Data Bit 2
+ Data Bit 3
+ Data Bit 4
+ Data Bit 5
+ Data Bit 6
+ Data Bit 7
- Acknowledge
+ Busy
+ P. End (out of paper)
+ Select
- Auto Feed
- Error
- Initialize Printer
- Select Input
Ground