Interface Control - OKIDATA ML320 Service Manual

Page: 25
Service Guide ML320/ML321
Chapter 2 Principles of Operation

2.3.02 Interface Control

Parallel Interface
In Rev A, B, and C printers, the data from the host is input through connector CN5 to the
interface LSI Q11.
In Rev D printers, the data from the host is input through connector CN6 to the interface LSI Q3.
The interface LSI latches this input data in synchronization with the STB-N signal. The BUSY
signal is active while this data is being processed. When processing is complete, the BUSY signal
is turned OFF, and an ACK-N is sent to the host (to request more data).
The BUSY signal is also sent to the host whenever the printer is incapable of receiving data.
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