Determine the baud rate for the serial printer and
check to see that it matches the baud rate for the computer.
(No baud rate is associated with a parallel port, although
does display one.)
To change the baud rate for a serial printer, in the
Printer Managerselect Serial Comm from the Settings menu,
then select a new baud rate.
Print a sample file.
Verify that the parity setting matches the computer's parity setting.
(If the printer is directly connected to the computer with a
wire that is less than 50 feet long,
it does not have to use the parity bit.)
To set the parity bit, in the
select Serial Comm from the Settings menu,
then select a new parity setting.
If the settings and baud rate are correct
and the output is still illegible,
check to see that the printer model is correct.
If you set up the printer with the wrong model name,
the wrong control characters can be sent to the printer.
This situation can cause output to disappear or be illegible.
To verify and change the printer model, in the
select Model from the Settings menu,
then select a new printer model.