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Appendix C Host Computer Interface
C-11
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
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.