It is HIGH by default and pulses LOW for 120ms when a call is received. This is basically the ‘interrupt-out’ pin from the module. TxD (Transmitter) pin transmits data from the module to the microcontroller. This pin is auto-baud so the baud rate at which you send the “AT” command after reset is the baud rate used. RxD (Receiver) pin is used to send commands to the module. If you got the module in an absolutely bad space, pull this pin LOW for 100ms to perform a hard reset. Remember that connecting this to the 5V will probably damage your module! It doesn’t even run on 3.3 V! So try using a 3.7V 2A rated external power source like a Li-Po battery or a DC-DC buck converter. It can be anywhere from 3.4V to 4.4 volts. NET is a pin where you can solder the helical antenna provided with the module.
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