9
3.3 Online Maintenance Using Mitsubishi PLC Programming Software
One of the most commonly used features of the modem is to contact a remote PLC
and then use programming software to interrogate operation. To do this requires a
two-stage operation.
3.3.1 Making a Connection
Firstly, with the modem connected to your PC running terminal software, dial the
remote modem. Entering the command ATD followed by the telephone number of
the remote site is one way of doing this.
NOTE: Ensure the settings in the terminal software have been set to
9600,8,N,1
.
Example 3-2
Dialling
ATD 0123456789 <enter>
to dial a site on 0123456789
ATDT 0123456789 <enter> forces tone dialling (default)
ATDP 0123456789 <enter> forces pulse dialling
Secondly, close the terminal application (
do not minimise
). The modem will hold the
connection. Then run your Mitsubishi programming software from Windows, for
example, GPPWIN.
3.3.2 Terminating a Call
To terminate the connection, exit the programming software and restart the terminal
application. Then select “Hang-up” or type:
+++
(3 pluses) followed by a pause of at least 1 second, or until the modem returns
“OK”
Then type ATH <enter> to ‘hang up’, the modem will close the connection and go on-
hook.
If the modem does not respond with OK after the three + symbols, try again.
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