Interface Control; Parallel Interface - OKIDATA Pacemark 3410 Service Handbook

2.1.04

Interface Control

The printer is capable of serial or parallel operation. The desired interface method is selected by
sliding the interface cover to expose the desired connector. When this is done, the interface
select switch is turned ON or OFF to inform the Interface/Motor Control LSI (Q5: B562 13497)
of the selected interface.

Parallel Interface

When the interface select switch is turned OFF, the parallel interface is selected and Q5 is in the
parallel interface mode.
The data from the interface is received through connector (CN-1) and Q5 latches this data in
sync with the STB signal.
The BUSY signal is turned ON as the data is processed. When processing is completed, the
BUSY signal is turned OFF and an ACK signal is sent to the host to request more data.
The BUSY signal is also turned ON when the printer is not able to receive data (the Print Buffer
is full, the printer is deselected or an error condition exists).
2-B.pcx
Principles of Operation 2 - 6 Pacemark 3410