B.4 RS-232C ProtocolB-8H4: ParityThe factory setting is 0 (none).H5: Protocol logicThe factory setting is 0.H6: Buffer nearly-full thresholdA percentage value from 0 to 99. The factory setting is 90.H7: Buffer nearly-empty thresholdA percentage value from 0 to 99. The factory setting is 70. The factory settings of the buffernearly-full and nearly-empty thresholds (H6 and H7) are subject to change without notice.The difference between the nearly-full and nearly-empty thresholds allows the computer tosend a fairly large amount of data in a continuous stream.H8: Received data buffer sizeThe input buffer size is specified in increments of 100 kB. The factory setting is 5 (500 kB).B.4.2 PRESCRIBE FRPO D0 CommandThe PRESCRIBE FRPO D0 command is provided to allow manipulating XON/XOFF whenan error has occurred on the serial interface. Table B-5 summarizes the error statuscorresponding to different D0 values.Parameter value Meaning0 None1 Odd2 Even3 IgnoredParameter value Meaning0 Combination of DTR (positive logic) and XON/XOFF1 DTR (positive logic)2 DTR ( negative logic)3 XON/XOFF4 ETX/ACKTiming of XON transfer tohost while Ready or WaitingSerial interface errorerror not handled error handledXON sent every 3-5 seconds D0=0 (default) D0=1XON not sent D0=10 D0=11Table B-5
