Lexmark C720 Reference Guide

There are four possible parity settings: Odd, Even, None, and Ignore.

Odd 

The port expects to receive data frames with an odd number of logical 
1’s per byte. The printer transmits XOFF and XON with odd parity. If the 
printer detects a parity error, the port sends X'5F' to the printer instead 
of the character sent by the host system.

Even

The port expects to receive data frames with an even number of logical 
1’s per byte. The port transmits XOFF and XON with even parity. If the 
port detects a parity error, the port sends an inverted question mark to 
the printer instead of the character sent by the host system.

None

The port expects no parity bit when it receives data. The port transmits 
XON and XOFF without parity bits.

Ignore

The port expects a parity bit when the port receives a data frame. The 
port ignores the parity bit. The port uses even parity when it transmits 
XON and XOFF.

Some printers post a 

 or a 

 (x represents 

the number of the serial port) the first time they detect a transmission error (parity, 
overrun, or framing). The 

 or the 

 can be 

reset from your printer operator panel or through MarkVision Professional. Refer to 
your printer user documentation for more information.

If repeated serial errors occur, power the printer off and back on to restore proper 
serial operation.

One data flow control protocol is available: XON/XOFF with programmable polarity. 
Refer to your printer user documentation for more information about selecting the 
protocol from your printer operator panel or through MarkVision Professional.