RS-232C Protocol

H5: Protocol logic

Parameter value

Meaning

0

Combination of 1 and 3 below

 

 

1

DTR/DSR, positive logic

 

 

2

DTR/DSR, negative logic

 

 

3

XON/XOFF

 

 

4

ETX/ACK

 

 

5

XON/XOFF recognized only as protocol

 

 

The factory setting is 0.

H6: Buffer nearly-full threshold

This is a percentage from 0 to 99. The factory setting is 90.

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 Kbytes. The factory-set value is 6, meaning 60 Kbytes.

B.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.

 

 

Serial interface error

 

 

Error not

Error handled

 

 

handled

 

Timing of XON

XON sent every

D0=0 (default)

D0=1

transfer to host

3-5 seconds

 

 

while Ready or

 

 

 

XON not sent

D0=10

D0=11

Waiting

 

 

 

 

 

 

 

Table B-4

 

 

 

B-10

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Kyocera FS-1020D manual H5 Protocol logic, H6 Buffer nearly-full threshold, H7 Buffer nearly-empty threshold

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