Hi, I am doing a project using 8051 and GSM module,SIM900B. I am using a 8051 microcontroller to send AT commands to GSM module and store the data in an array and send the stored data as a text message to a mobile . I am able to see both gsm module and microcontroller unit working perfectly when connected to computer seperately through serial cable,but when I am connecting both the devices with the help of a cross over cable, I am able to send sms using microcontroller and GSM module but unable to receive any data.I am using a MAX 232 on microcontroller board and SIM300_EVB_V2.02 for placing the GSM module SIM900B.
expecting a reply at the earliest.
Thanks & Regards, kamalesh.
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