Owner`s manual

7
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Please see Section 4.1 if you are interfacing to a parallel port or
Section 4.2 if interfacing to a serial port.
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Parallel ports on the MOD 24-4A or MOD 24-4E I/O modules 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 24H. A DB-25 male to Centronics cable is
required between each peripheral having a Centronics connector and
the Model 24H (same as IBM PC to Centronics cable).
CAUTION: Some standard EIA-232 DB-25 cables may have Pin 1
grounded to the connector shell. Since Pin 1 is the Strobe signal in
Centronics protocol, this ground must be removed if the cable is used
between an IBM PC and the Model 24H.
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 SIGNAL
PIN NO. NAME
1 - Strobe
2 + Data Bit 0
3 + Data Bit 1
4 + Data Bit 2
5 + Data Bit 3
6 + Data Bit 4
7 + Data Bit 5
8 + Data Bit 6
9 + Data Bit 7
10 - Acknowledge
11 + Busy
12 + P. End (Out of Paper)
13 + Select
14 - Auto Feed
15 - Error
16 - Initialize Printer
17 - Select Input
18-25 Ground