Printronix MVP Series - Manual (Page 185)

Interfaces 8–17
Option 72 — Data Word Interface Configuration
Serial data bytes are transferred in a format that consists of a single start bit
followed by 7 or 8 data bits, one parity bit, and 1 or 2 stop bits. The basic
data word is 7 bits long. If the 8th bit is used, it can be used either to choose
between the Primary Font PROM or the Alternate Font PROM on the Serial
Controller PCBA, or to identify a Paper Instruction (PI) for the EVFU. The
8th bit can also be ignored. The parity bit is used for either even parity or odd
parity or it can be ignored. Any parity error detected by the printer will cause
a question mark (?) to be printed for that character.
Option
Number
Display Configuration
Description
.0 72.0 Enable 7 bit data word – no parity check (default).
.1 72.1 Enable 7 bit data word with even parity check.
.2 72.2 Enable 7 bit data word with odd parity check.
.3 72.3 Enable 8th bit as data bit for font selection – no parity check.
.4 72.4 Enable 8th bit as data bit for font selection with even parity check.
.5 72.5 Enable 8th bit as data bit for font selection with odd parity check.
.6 72.6 Enable 8th bit as paper instruction – no parity check.
.7 72.7 Enable 8th bit as paper instruction with even parity check.
.8 72.8 Enable 8th bit as paper instruction with odd parity check.
.9 72.9 Ignore 8th bit – no parity check.