Hi Ritesh,If your gsm module | Microcontroller › 8051 › Gsm with microcontroller interfacing dout › Hi Ritesh,If your gsm module March 17, 2013 at 5:05 pm #9337 AJISH ALFREDParticipant Hi Ritesh, If your gsm module has a max232 IC, then you must use a max232 IC at your microcontroller side also. If there was no max232 IC then you could have connected it directly to the microcontroller.
