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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 parameters 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 parameters and their identification codes are given below.
H1: Baud rate
Parameter value Baud rate
3 300
6 600
12 1200
24 2400
48 4800
96 9600
19 19200
38 38400
57 57600
11 115200
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
Parameter value Meaning
0None
1Odd
2Even
3Ignore
The factory setting is “None” (0 on the status printout).
C.3. RS-232C/RS-422A Protocol
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