Gsm with microcontroller interfacing dout

[ritesh]

Hello friends

I want to interface gsm module sim 300 with p89v51rd2 . If i interface gsm with hyper terminal it working but i have problem with interfacing with microcontroller.

If i interface gsm with microcontroller so it is require max 232 ic? . It is already 1 max232 ic will be given on gsm module.

Thanks

[AJISH ALFRED]

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.

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