Oce WP20 Operation Manual

Contents

Appendix C Host Computer InterfaceC-4A protocol is a set of rules the computer follows in sending datato the printer. The RS-232C parameters are stored in batterybacked-up memory. They are indicated on the status page.They can be changed by the FRPO (firmware reprogram)command described in theProgramming Manual provided onthe CD-ROM supplied with the printer. The parameters andtheir identification codes are given below.H1: Baud rateThe factory setting is 9600 baud.H2: Data bits7 or 8, factory-set to 8.H3: Stop bits1 or 2, factory-set to 1.H4: ParityThe factory setting is “None” (0 on the status page).H5: Protocol logicThe factory setting is 0.H6: Buffer nearly-full thresholdThis is a percentage from 0 to 99. The factory setting is 90.H7: Buffer nearly-empty thresholdThis is a percentage from 0 to 99. The factory setting is 70.The factory settings of the buffer nearly-full and nearly-empty thresholds (H6 and H7) are subject to change withoutnotification.The gap between the nearly-full and nearly-empty thresholdsallows the computer to send a fairly large amount of data ina continuous stream.H8: Received-data buffer sizeThis is the size of the input buffer, specified in units of 10Kbytes. The factory-set value is 6, meaning 60 Kbytes.PRESCRIBE FRPO D0 CommandThe PRESCRIBE FRPO D0 command provides control overXON/XOFF operation when an error occurs on the serialinterface. The following table summarizes the error statuscorresponding to different D0 values.RS-232C ProtocolParameter value Baud rate12 120024 240048 480096 960019 1920038 3840057 5760011 115200Parameter value Meaning0 None1 Odd2 Even3 IgnoreParametervalueMeaning0 Combination of 1 and 3 below1 DTR/DSR, positive logic2 DTR/DSR, negative logic3 XON/XOFF4 ETX/ACK5 XON/XOFF recognized only as protocolSerial interface errorError nothandledErrorhandledTiming ofXON transferto host whileReady orWaitingXON sentevery 3-5secondsD0=0 (default) D0=1XON not sent D0=10 D0=11