I have connected my nokia 2700 classic cell fone via universal USB data cable to check that either it accepts at commands or not via hyperterminal.But when I connected and want to write"AT" then i was unable to writthen it on hyperterminal screen.I don't know what is the problem.Plz help me.Is there any connection og hyperterminal with modem inside the pc,that is it is necessary that modem should be present inside pc?
i am using 8051 mc and 6230 cell fone.This cell fone can send sms and also receive it using at commands.But i have a problem that with max232 i have connected it.The pin to wihich i have connected my cell fone must generate 3.9V.It isn,t generating.One more thing the pine that i have connected to mc also dont have 5v.
plz help me