Epson EPL-N1200 Reference Manual page 93

1. Type HSERIAL at the DOS prompt and press Enter to bring up
the list of parameters for the port and the baud rate
selection.
2. Select the appropriate parameters from the list and type the
following:
For example, if you would like to use the COM1 port with the
57600 baud rate, type the following:
If you need help, type the following:
4-20
Options
C:\HSERIAL
C:\HSERIAL /P=n /B=m
n = parameter for the port selection
m = parameter for the baud rate selection
C:\HSERIAL /P=1 /B=576
C:\HSERIAL\?