Owner`s manual

15
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Please see Section 5.1 for parallel port cabling information or Section
5.2 for serial port cabling information. Appendix A provides
recommended cabling pinouts.
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Parallel ports on the Model 24 have DB-25 female connectors. A
straight, DB-25 male-to-male cable is required between each IBM PC
computer (or compatible) and the parallel ports on the Model 24. A
DB-25 male to Centronics cable is required between each printer
having a Centronics connector and the Model 24 (same as IBM PC to
Centronics cable).
CAUTION: Some standard EIA-232 DB-25 cables may have Pin 1
grounded to connector shell. Since there is a strobe line on Pin 1 in
Centronics protocol, this ground must be removed if the cable is used
between an IBM PC and the Model 24.
The pin assignment for the DB-25 connector is similar to the IBM PC
parallel connector and uses the following signals for communication:
STANDARD TTL LEVELS
SIGNAL DB-25
NAME PIN NO.
- Strobe 1
+ Data Bit 0 2
+ Data Bit 1 3
+ Data Bit 2 4
+ Data Bit 3 5
+ Data Bit 4 6
+ Data Bit 5 7
+ Data Bit 6 8
+ Data Bit 7 9
- Acknowledge 10
+ Busy 11
+ P. End (Out of Paper) 12
+ Select 13
- Auto Feed 14
- Error 15
- Initialize Printer 16
- Select Input 17
Ground 18-25