Oki OKIPAGE 10ex Maintenance Manual page 224

3.13 Option Tray Control
The kinds of option trays, High capacity Second Paper Feeder and Multi purpose Feeder can be
connected to the printer. The trays are distinguished by two digit ID numbers.
The option trays and the printer communicate with each other through bi-directional clock
synchoronized serial interface. The printer always sends a command first, then each option tray
interpret it. Because the command contains an ID, the selectes option tray takes approriate
actions, then sends back a reply. The command and reply are transmitted back and forth on
OPTSD-P signal line by synchronizing OPTSCLK-N clock signal which is sent by the printer. The
printer knows the timing when it outputs the clock for the reply by sensing OPTSDR-N signal which
is turned to zero by the option tray when it is ready for the reply.
The option tray's paper feeding action is triggered by a command sent by the printer. When the
tray delects a signal on OPTPSIN-N signal line, which indicates the paper reaches a input sensor
in the printer, the tray stops the paper feeding after carrying out the paper feeding according to
the predetermined steps which have been downloaded from the printer at power-up time.
Status of the option trays such as no paper cassette, paper out and cover open, are informed to
the printer though a reply in response to a status inquiry command.
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