Im trying to connect my SIM900A. While trying to connect I'm getting some junk characters and not able to pass A T Commands

Attached are the screen shot.

enter image description here

Note:- Im getting the blue light blinking.So dont think any issue with SIM900A

Please suggest

Thanks in advance

closed as off-topic by Dat Ha, sa_leinad, Mattia, brtiberio, Code Gorilla Nov 18 '16 at 13:06

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  • 1
    And where is the Arduino in all this? – Majenko Nov 13 '16 at 16:28
  • 1
    You might also like to use the right baud rate. I believe the SIM900 has a default of 9600 baud, not 115200 baud. – Majenko Nov 13 '16 at 16:30
  • I wrote a basic code to call my own mobile from an Arduino but it dint work. So to check if there is any issue with SIM900A. I tried connecting it with PC directly. I even tried with baudrate 9600 then the only output Im getting is ........Hi...Z..Z... .A.T -- @Majenko – Satyendu Sekhar Nayak Nov 13 '16 at 16:37
  • 1
    Oh dear. I assume your SIM900 board doesn't have a MAX232 chip on it? – Majenko Nov 13 '16 at 16:48
  • 4
    As @Majenko said, where is the Arduino. P.S. voting to close. – Dat Ha Nov 13 '16 at 18:25