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B.4 RS-232C Protocol
B-8
H4: Parity
The factory setting is 0 (none).
H5: Protocol logic
The factory setting is 0.
H6: Buffer nearly-full threshold
A percentage value from 0 to 99. The factory setting is 90.
H7: Buffer nearly-empty threshold
A percentage value 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 without notice.
The difference between the nearly-full and nearly-empty thresholds allows the computer to
send a fairly large amount of data in a continuous stream.
H8: Received data buffer size
The input buffer size is specified in increments of 100 kB. The factory setting is 5 (500 kB).
B.4.2 PRESCRIBE FRPO D0 Command
The PRESCRIBE FRPO D0 command is provided to allow manipulating XON/XOFF when
an error has occurred on the serial interface. Table B-5 summarizes the error status
corresponding to different D0 values.
Parameter value Meaning
0None
1Odd
2Even
3 Ignored
Parameter value Meaning
0 Combination of DTR (positive logic) and XON/XOFF
1 DTR (positive logic)
2 DTR ( negative logic)
3 XON/XOFF
4ETX/ACK
Timing of XON transfer to
host while Ready or Waiting
Serial interface error
error not handled error handled
XON sent every 3-5 seconds D0=0 (default) D0=1
XON not sent D0=10 D0=11
Table B-5