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I hav a sim 300 gsm modem , it works when a sim is inserted and dial to that number. But i got problem in serial communication with the device.
i am using hyper terminal to communicate but i cant. I have aonther modem and i can communicate to that. I also tried connecting direct to the Rx and Tx pins not via RS232 but i cant.
can i fix the problem? some one plz help…Hi Sharon,
“I also tried connecting direct to the Rx and Tx pins not via RS232”
Please don’t do like that, the 12V logic levels from PC could damage your device. I think there must be some hardware issues with that board.
Suggest you to do a continuity check on the incoming and outgoing connections of MAX232 IC in the borad. Try replacing the IC also if possible
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