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RS-232C/RS-422A Protocol
PRESCRIBE 2e FRPO D0 command
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 10K bytes. The factory-set value is 6 meaning
60K bytes.
The PRESCRIBE 2e 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.
Timing of XON transfer to
XON sent every 3-5
host while Ready or
seconds
Waiting
XON not sent
Serial interface error
error not handled
D0 = 0 (default)
D0 = 1
D0 = 10
D0 = 11
error handled
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