I have a problem with my TER HX-200 module. When I turn the power on, it lights the red diode (ERROR). It is equipped with a SIM card and an antenna.
When I send to it reset signal (switching DTR 6 times per second) I receive some rubbish on the RS-232 port but the status diode remains still red.
I suspect having burnt the module as once I powered it without the antenna connected, but if someone has other opinion, please give me some hint.