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RS-232C/RS-422A Protocol
C-11
H5: Protocol logic
H5: Protocol logicH5: Protocol logic
H5: Protocol logic
The factory setting is 0.
H6: Buffer nearly-full threshold
H6: Buffer nearly-full thresholdH6: Buffer nearly-full threshold
H6: Buffer nearly-full threshold
This is a percentage from 0 to 99. The factory setting is 90.
H7: Buffer nearly-empty threshold
H7: Buffer nearly-empty thresholdH7: Buffer nearly-empty threshold
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
H8: Received-data buffer sizeH8: Received-data buffer size
H8: Received-data buffer size
This is the size of the input buffer, specified in units of 10 Kbytes. The
factory-set value is 6, meaning 60 Kbytes.
Since DTR/DSR protocol is not used with the RS-422A standard, select a
parameter value other than 0, 1, or 2 for the H5 setting when using the
RS-422A interface.
C.4.1 PRESCRIBE FRPO D0 Command
The PRESCRIBE FRPO D0 command provides control over XON/XOFF
operation when an error occurs on the serial interface. The following table
summarizes the error status corresponding to different D0 values.
Parameter value
Parameter valueParameter value
Parameter value Meaning
MeaningMeaning
Meaning
0 Combination of 1 and 3 below
1 DTR/DSR, positive logic
2 DTR/DSR, negative logic
3XON/XOFF
4 ETX/ACK
5 XON/XOFF recognized only as protocol
Note
Serial interface error
Serial interface errorSerial interface error
Serial interface error
Error not handled
Error not handledError not handled
Error not handled Error handled
Error handledError handled
Error handled
Timing of XON transfer to
host while Ready or Waiting
XON sent every 3-5 seconds D0=0 (default) D0=1
XON not sent D0=10 D0=11
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