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I want to interface GSM sim300 modem to 8051 for sms sending application.
I have GSM modem similar to the one attatched with this. It has RS232 female connector inbuilt on it and so it has MAX232 too. so is there any need to use one more MAX232 between this RS232 Female connector and 8051?
You must use another max232 for interfacing the modem with 8051.
The inbuilt max232 does ttl to rs232 conversion, so that it can be connected with the rs232 standard serial port of devices like PC.
You need a conversion from rs232 back to ttl using another max232 in order to interface it with your microcontroller.
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