Oki ML420 Maintenance Manual
Also see for ML420 Series: Specification sheetUser guideUser guideInstallationInstallation
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Contents
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42113901TH01 Rev.3 126 /Oki Data CONFIDENTIALAppendix C RS-232C SERIAL INTERFACE BOARD (OPTION)1. GENERALThis section describes the operation of the RS-232C Serial Interface board installed in the Printeras an option using a start-stop synchronization and serial communications circuit. This serialinterface board is capable of transmitting and receiving simultaneously at speeds up to 19,200bits per second. Two protocols are available: printer Ready/Busy and X-ON/X-OFF modes.2. OPERATION DESCRIPTION2.1 Element Description(1) 80C51 with MASK ROMAn eight-bit microprocessor controller that controls the following:(a.) Serial interface protocol and data transfer through a serial port.(b.) Message buffer.(c.) Transmission of parallel data to the printer.(2) 75189An RS-232C standard line receiver(3) 75188An RS-232C standard line driver.(4) ROM (No Mount)A 64Kbit ROM that contains the serial interface control program.(5) RAMA 64Kbit static RAM used as a message buffer. |
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