Appendix C Host Computer Interface
C-3
A protocol is a set of rules the computer follows in sending data
to the printer. They are indicated on the status page. Parameters
can be changed from the operator panel. See
Changing Serial
Interface Modes on page 3-19
. The parameters and their identi-
fication codes are given below.
H1: Baud rate
The factory default setting is 9600 baud.
Some computers may not be compatible with a baud rate of
115200 bps. If you set the baud rate to 115200 and communica-
tion problems occur, lower the baud rate.
H2: Data bits
7 or 8; the factory default setting is 8.
H3: Stop bits
1 or 2; the factory default setting is 1.
H4: Parity
The factory default setting is None (0 on the status printout).
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 no-
tification.
The gap between the nearly-full and nearly-empty thresholds al-
lows the computer to send a fairly large amount of data in a con-
tinuous 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 FRPO D0 command
The PRESCRIBE FRPO D0 command is provided to allow ma-
nipulating XON/XOFF when an error has occurred on the serial
interface. The following table summarizes the error status corre-
sponding to different D0 values.
3. RS-232C Protocol
Parameter value
Baud rate
12
1200
24
2400
48
4800
96
9600
19
19200
38
38400
57
57600
11
115200
NOTE
Parameter value
Meaning
0
None
1
Odd
2
Even
3
Ignore
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
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