Interface Control - OKIDATA ML380 Service Manual

Page: 17
Service Guide ML380
Chapter 2 Principles of Operation

2.1.04 Interface Control

Parallel Interface
The data from the interface is received through connector (CN-1) and the Interface LSI (Q7) latches this
data in sync with the STB signal.
The BUSY signal is switched ON as the data is processed. When processing is completed, the BUSY
signal is switched OFF and an ACK signal is sent to the host to request more data.
The BUSY signal is also switched ON when the printer is not able to receive data (buffer is full, printer is
deselected or an error condition exists).
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