How do I switch between the HL7800 AT command interface and the smartBASIC AT command interface of the Pinnacle 100 Cewllular modem?

In order to toggle between the HL7800 AT command interface and the smartBASIC AT command interface, the DTR tickbox in UwTerminal needs to be de-asserted (Toggled) and then re-asserted(Toggled) again.