Murata Electronics Corporation 28 6/2/2021
COM24 defaults to com1: and 9600 bps. The port and baud rate can be changed through the
invocation of the program. The invocation syntax is shown below:
COM24 <data rate> <port number>
Note that the data rate applies to the serial port of the computer. This parameter has no effect
on the modem. If the modem is set for 9600bps but COM24 is invoked to run at 19.2kbps,
the computer and the modem will be unable to communicate. When the modems are used for
the first time, if they are connected to serial port 1, the program can be invoked without data
rate or port number parameters.
The following function keys on the PC have the following functions in COM24:
F1 Toggles state of DTR (Sleep). State is shown in status line.
F2 Toggles state of RTS. State is shown in status line.
F3 Transmits “:wit2400”. Used to enter control mode.
F5 Toggles local echo. If you are transmitting characters through one modem to
another WIT2420, this allows you to see what you are typing.
F6 Toggles stream mode. Causes COM24 to transmit a repeating pattern of
characters. Useful for testing.
F8 Toggles binary mode. Displays extended ASCII and control characters.
Useful for testing.
PgUp Sets data rate of PC serial port to next higher value. Value is displayed in
status line. Useful when COM24 is used to change the WIT2420 interface
data rate. COM24 can communicate at new data rate without having to exit
and re-enter COM24.
PgDn Sets data rate of PC serial port to next lower value. Value is displayed in
status line.
The values of DTR (Sleep), RTS, DSR, CTS, DCD and the PC serial port rate are displayed
in the status line at the bottom of the display.
WinCOM24. WinCOM24 provides the same functions as COM24. WinCOM24 is designed
to run under Windows 95, 98 and NT. The function keys are the same in WinCOM24 as in
COM24.
6.2. Demonstration Procedure
The procedure below provides a quick demonstration of the WIT2420.
1. Attach a transceiver to each computer, preferably between 5' and 30' apart for
convenience.
2. Start COM24 running on both computers by typing "COM24". If you are connected to a
serial port other than COM1:, use "COM24 9600 <port number>" to start the program;
e.g., for COM2:, use "COM24 9600 2". If you prefer, almost any other serial
communications program such as Procomm or QModem set for 9600 bps will also work.
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