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do we have to install any software to send sms in analogic gsm modem???our circuit components are 8051--->MAX232---->gsm modem analogic is the company name...
That makes no sense! You say you "used hyperterminal to send SMS", but then you say the you "could not type AT in the hyperterminal" - so how could you possibly have sent an SMS without being able to type AT??!
Note that this forum is Keil's forum which they provide for discussing their products:
"The Keil Discussion Forum is an open forum where you may post questions and comments about Keil products." http://www.keil.com/forum/
This has nothing to do with Keil products!