GSM modules have serial | Microcontroller › 8051 › How to interface sim900 with 8051 microcontroller › GSM modules have serial September 23, 2015 at 5:15 pm #13318 Ashutosh BhattParticipant GSM modules have serial interface. they can be connected to serial Tx-Rx pin with micro controller pls visit our tutorials for GSM interfacing
