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Appendix A Host Computer Interface
A-4
A protocol is a set of rules the computer follows in sending data
to the printer. The RS-232C parameters are stored in battery
backed-up memory. They are indicated on the status page.
They can be changed by the FRPO (firmware reprogram)
command described in the
PRESCRIBE Commands Technical
Reference
provided on the CD-ROM supplied
with the printer.
The parameters and their identification codes are given below.
H1: Baud rate
The factory setting is 9600 baud.
H2: Data bits
7 or 8, factory-set to 8.
H3: Stop bits
1 or 2, factory-set to 1.
H4: Parity
The factory setting is “None” (0 on the status page).
H5: Protocol logic
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.
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.
RS-232C Protocol
Parameter value Baud rate
12 1200
24 2400
48 4800
96 9600
19 19200
38 38400
57 57600
11 115200
Parameter value Meaning
0 None
1Odd
2Even
3 Ignore
Parameter
value
Meaning
0 Combination of 1 and 3 below
1 DTR/DSR, positive logic
2 DTR/DSR, negative logic
3 XON/XOFF
4ETX/ACK
5 XON/XOFF recognized only as protocol
Serial interface error
Error not
handled
Error
handled
Timing of
XON
transfer to
host while
Ready or
Waiting
XON sent
every 3-5
seconds
D0=0
(default)
D0=1
XON not
sent
D0=10 D0=11
101


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