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

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Xerox FS-C8008N, FS-C8008DN manual Prescribe Frpo D0 Command
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