TA Triumph-Adler LP 4024 - Manual (Page 212)

RS-232C Protocol
C-8
H5: Protocol logic
The factory default setting is 0.
H6: Buffer nearly-full threshold
This is a percentage from 0 to 99. The factory default setting is 90.
H7: Buffer nearly-empty threshold
This is a percentage from 0 to 99. The factory setting is 70.
The factory default 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 default setting is 6, meaning 60 Kbytes.
PRESCRIBE 2e FRPO D0 command
The PRESCRIBE 2e FRPO D0 command is provided to allow manipulating
XON/XOFF when an error has occured on the serial interface. The
following table summarizes the error status corresponding to different D0
values.
Parameter value Meaning
0 Combination of 1 and 3 below
1 DTR, positive logic
2 DTR, negative logic
3 XON/XOFF
4 ETX/ACK
5 XON/XOFF recognized only as protocol
Timing of XON transfer to host
while Ready or Waiting Serial interface error
Error not handled Error handled
XON sent every 3 to 5 seconds D0=0 (default) D0=1
XON not sent D0=10 D0=11