HP 24SII - Manual (Page 33)

You will also need to change the serial port configuration of your PC
COM port to match that of the Model 24SII's Serial Port Configuration.
If you will be using the Model 24SII's factory default Serial Port
Configuration (9600 baud, 8 data bits, 1 stop bit, and no parity), this is
accomplished via the following DOS command:
Mode COMx: 9600,n,8,1,P
where x is the number of the appropriate com port. This command
should be part of your AUTOEXEC.BAT program.
EXAMPLE: Suppose you are connecting your PC's COM1 port to the
Model 24SII DES in serial and you intend to use the RAMEXEC hot
key software which has been copied to a subdirectory called
BAYTECH. Your AUTOEXEC.BAT program would need contain the
following:
.
.
PATH=C:\...;C:\BAYTECH
MODE LPT1: =COM1:
MODE COM1: 9600,N,8,1,P
RAMEXEC
.
.
The vertical dots before the PATH command and after the RAMEXEC
command represent other commands that may be part of your
AUTOEXEC.BAT file. The horizontal dots shown in the PATH
command represent other subdirectories that may be part of the
PATH command.
NOTE: The DOS MODE command will support a maximum baud rate
of 9600 bps. BayTech supplies a program, SMODE.EXE, which
allows you to set your PC com port for serial speeds up to 115,200
bps. Please see
Section 4.2 for instructions to obtain the SMODE
command from the supplied utility diskette. The instructions for
SMODE are contained in the README file created by running the
INSTALL program.