Oki Data CONFIDENTIAL42114131TH Rev.1 112 /Appendix B 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.ROM/RAM/CPU is not installed in this option board. Driver and receiver IC are controlledaccording to the control signal from the Main Control PCB.2. OPERATION DESCRIPTION2.1 Element DescriptionThe driver and the receiver for RS232C of 5V signal power supply are installed on this optionalboard.(1) HIN202EIt is driver, and receiver IC for RS232C that operates by 5V single power supply.
