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Hai, I want to work with Nokia 6610 interface with 8051 and programming in such way to send and get sms. While connect with HYPER-TERMINAL using DKU-5 cable with NOKIA 6610 it responds for 'AT' with 'OK'. The same while I try to get it ...mmm..No response.
I tested all combination no handsaking is required. Tell me correct way how to solve this one.
"My doubt is the dongle in the cable gets power from RTS,DTR signal from RS-232 line."
Are you saying that you doubt whether the "dongle" gets its power from RTS,DTS?
Or are you certain that the "dongle" does get its power from RTS & DTS, but don't know how to provide that?
You could test the former by using just a 3-wire cable between the "dongle" and the PC's COM port - if it requires more than just TxD, RxD, and GND, then it won't work...
If the latter, then all you have to do is provide the appropriate RS232 levels on RTS and DTS from your 8051 system. The simplest way to do this is probably to use an RS232 transceiver that has 2 extra transmitters, and just wire them to permanently give the required RS232 Output level(s) to RTS and DTS.
"Would you suggest me some better idea..."
I've already given my suggestion: Don't use a Phone