Oki OKIOFFICE 84 Service Manual page 395

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S : Send signal (picture data/protocol/tonal signals/PB tone etc.)
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R : Received signal (picture data/protocol/tonal signals etc.)
OPE interface signals
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TXDOPE : This signal transmits sequentially the contents of each data of TXD (LED on/off information, etc.) to
OPE in serial data from CPU.
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RXDOPE : This signal transmits sequentially the contents of each data of RXD (key code information, etc.) to
CPU in serial data from OPE.
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OPECHK : Use to monitor the operation of the OPE unit.
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OPERST : Reset signal for OPE unit
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