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DADF System Control
Principles of Operation
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DADF System Control
The DADF Control PWB monitors the status and controls the operation of the DADF. The
DADF Control PWBA also accepts commands from the Pre-IPS PWBA and provides it with
status information, such as DADF Belt Motor status and a Document Ready signal. However,
the Pre-IPS is itself partially controlled by the IOT CPU PWBA (via the Post-IPS PWBA).
Therefore, DADF control is ultimately a shared function of these three PWBAs. Command and
status communication with the DADF uses a bidirectional serial communications port. Refer to
Figure 1 for a DADF simplified block diagram and Figure 2 for the communication links
between the DADF and the machine.
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