8-14

Interfaces

The following illustration shows the pin assignments for connecting the 25-pin connector to the 36-pin connector. The symbol * indicates an active low signal.

Printer

Computer

Side

Side

36-Pin

25-Pin

Connector

Connector

1284-C

 

Note: Lexmark IEEE 1284 compliant cables are supported up to 20 feet. Cable lengths greater than 20 feet are not supported. The cable drawing to the left is a functional representation of the Lexmark cables; it does not reflect correct pairing of leads or unused pairs.

The parallel interface consists of an 8-bit parallel data bus with the following characteristics:

Uses 17 of the 36 positions on the printer connector, as follows:

The host system controls 12 lines, which it uses to send data and com- mands to the printer.

The printer controls five lines. The printer uses two lines to notify the com- puter when data is transferred successfully and three lines to report printer status.

Controls synchronization with an externally supplied STROBE* pulse.

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Image 351
Lexmark manual Printer Computer Side 36-Pin 25-Pin Connector 1284-C