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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.