i m unable interface gsm modem kit (st2133) using microcontroller AT89S51 to just send an sms . is it possible to interface with using only 3 pins of uc i.e txd,rxd ,gnd of uc.please send me a sample code for this gsm modem interfacing.i hope a helping hand from yours.
Erik Malund! You were instructed to deliver code not to ask questions! ah, but there was no RFQ
Erik