try to test at command on | Microcontroller › 8051 › INTERFACING SIM 300 GSM MODEM WITH PICAXE 08M2 › try to test at command on May 11, 2013 at 4:19 pm #9718 R KumarParticipant try to test at command on hyperterminal whether you recieve sms , if this part is successful try to do it with gsm module, make sure IF THE DEVICE USE HARDWARE HANDSHAKING – Use RXD, TXD, GND , RTS AND CTS pin while doing serial communication.
