Siemens SINAUT MD720-3 System Manual page 64

Service functions
Method 2:
Change the operating mode by AT commands. Enter therefore the following
commands:
+++
AT^PARSTART<CR>
AT^PARSET="TERMINAL","MODE","SUPERVISED" <CR>
AT^PARSET="TERMINAL","MODE","
AT^PAREND<CR>
The device restarts in the selected new operating mode.
64
Activates the AT command interface and interrupts the data transfer.
Activates the AT configuration
Selects the Terminal Mode, or
Selects the OPC Mode.
Deactivates the AT configuration and forces a restart of the SINAUT
MD720-3.
"<CR>
DISABLE
C79000-G8976-C211
SINAUT MD720-3