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There is Max232 IC on board which brings RS232 back To TTL and then feeds into the GSM module. 5V or 3V , both represent HIGH state RS232 is used in this case to communicate with another RS232 based device , and RX and TX of the module that work on TTL (just a guess) are connected to a female header...

I'am trying to interface a GSM module with flowcode for PIC and the Tutorial I'am following suggests a module SmartGM862 development board which is not available in my market but instead some other SIM900A/C/D module development boards are available. My question is can I interface sim900 series modu...