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Serial Data Communication
The printer communicates with and controls the Paper Feeder,
the Lower Cassette Assembly, and the Envelope Feeder through
serial data lines SLI and SLO. In addition, the DC Controller
uses information encoded on SLI from the High Voltage
Transformer to monitor the toner level.
Communicating with the various subassemblies of the printer
through serial data lines allows many of the functions of the
processor on the DC Controller to be off-loaded to local State
Machines on the subassemblies. The DC Controller uses data line
SLI to receive status information (such as Ready, or Paper Out)
from the subassemblies. Data line SLO is used to issue
commands or to request status.
The State Machines on the subassemblies operate on a clock
synchronous to the DC Controller processor. The printer serial
data lines use serially encoded data protocol to receive and send
information.
Figure 5-2 Serial Data Flow
5-4 Functional Overview