Switching from data mode to AT mode

I haven’t been able to get the “+++” to work to switch from data mode to AT mode. Does this not work while using the emulator? Also, every time i try ATO i get the response ERROR when the radio is in AT mode. Is there a way to determine what the error is? Any help would be appreciated. Thanks in advance.

Does it work from an ordinary terminal or terminal emulator? (eg, Hypoterminal)

No, in hyperterminal I still get ERROR as the response.