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C.3. RS-232C/RS-422A Protocol
C-6
C.3. RS-232C/RS-422A Protocol
A protocol is a set of rules the computer follows in sending data to the printer. The RS-232C/RS-422A param-
eters are stored in battery backed-up memory. They are indicated on the status printout. They can be
changed by the FRPO (firmware reprogram) command described in the Programming Manual. The param-
eters 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 printout).
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.
Parameter value Baud rate
12 1200
24 2400
48 4800
96 9600
19 19200
38 38400
57 57600
11 115200
Parameter value Meaning
0None
1Odd
2Even
3Ignore
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