hi there. it s not possible | Microcontroller › 8051 › interfacing of gsm module using interrupt › hi there. it s not possible March 13, 2013 at 5:50 pm #9308 jayParticipant hi there. it s not possible to interface mcu with gsm-300 at tx pin. because gsm module only reply after you send command at rx pin. you shoule use ringer out put for inturrept purpse . if possible tell me in briff.
