Xerox FS-C8008N, FS-C8008DN manual B.4.2 PRESCRIBE FRPO D0 Command, H4 Parity, H5 Protocol logic

B.4 RS-232C Protocol

H4: Parity

Parameter value	Meaning
0	None
1	Odd
2	Even
3	Ignored

The factory setting is 0 (none).

H5: Protocol logic

Parameter value	Meaning
0	Combination of DTR (positive logic) and XON/XOFF
1	DTR (positive logic)
2	DTR ( negative logic)
3	XON/XOFF
4	ETX/ACK

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-5summarizes the error status corresponding to different D0 values.

Timing of XON transfer to	Serial interface error
host while Ready or Waiting	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

B-8