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6 Service functions
6
6.1
Switching between Terminal mode and OPC Mode
The MODEM MD720 is delivered by the factory with activated Terminal Mode.
Operated in combination with a S7-200 the OPC Mode of the MODEM MD720 will
be activated by program building blocks of the connected S7-200 PLC during the
initialization.
Manual switching
There are the following two methods to switch the MODEM MD720 manually from
the Terminal Mode into the OPC Mode and vice versa.
Change the operating mode by AT commands. Enter therefore the following
commands:
+++
Activates the AT command interface and interrupts the data transfer.
AT^PARSTART<CR>
Activates the AT configuration
AT^PARSET=”TERMINAL”,”MODE”,”SUPERVISED” <CR>
Selects the Terminal Mode, or
AT^PARSET=”TERMINAL”,”MODE”,”
DISABLE
”<CR>
Selects the OPC Mode.
AT^PAREND<CR>