C.3. RS-232C/RS-422A 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 sub- ject 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.

Since DTR/DSR protocol is not used with the RS-422A standard, select a pa- rameter value other than 0, 1, or 2 for the H5 setting when using the RS-422A interface.

PRESCRIBE II FRPO D0 command

The PRESCRIBE II FRPO D0 command is provided to allow manipulating XON/XOFF when an er- ror has occured on the serial interface. The following table summarizes the error status corre- sponding to different D0 values.

 

 

Serial interface error

 

 

error not handled

error handled

Timing of XON transfer

XON sent every 3-5

D0 = 0 (default)

D0 = 1

to host while Ready or

seconds

 

 

Waiting

XON not sent

D0 = 10

D0 = 11

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Kyocera FS-3700 manual Prescribe II Frpo D0 command, Parameter value Meaning, Serial interface error