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C-16
H7: Buffer nearly-empty threshold
This 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 without notification.
The gap 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
This is the size of the input buffer, specified in units of 10 K bytes. The factory-set value is 6
meaning 60 K bytes.
PRESCRIBE IIe FRPO D0 command
The PRESCRIBE IIe FRPO D0 command is provided to allow manipulating XON/XOFF when an
error has occurred on the serial interface. The following table summarizes the error status
corresponding to different D0 values.
Serial interface error
error not handled error handled
Timing of XON transfer XON sent every 3-5 D0 = 0 (default) D0 = 1
to host while Ready or seconds
Waiting
XON not sent D0 = 10 D0 = 11
C.3. RS-232C/RS-422A Protocol