dear all, i am using at89c52 along with SIM300 i am using it for sending/receiving TEXT- SMS one of the program function is to send a SMS whenever SIM300 is turned on (sending sort of initial h/w status through sms) here i am having a problem; coz out of 10 tries i am getting SMS in 7-8 tries only for remaining 2-3 tries it simply doesn't send any sms i am giving 30-sec of delay after powering up the SIM300 as a booting time i don't know why am I not getting 100% result
any suggestion regards
Look-up AT+CMEE in your AT Commands manual...
thankx I will check that command; actually after 30-second delay I send "AT" and check its response and then only i proceed in fact if the program doesn't get proper response it will never try to send any SMS, thakns
"then only i proceed in fact if the program doesn't get proper response it will never try to send any SMS"
That is necessary - but is by no means sufficient.
In case you don't understand the concepts of necessary and sufficient conditions, see:
www.sfu.ca/.../conditions1.htm
en.wikipedia.org/.../Necessary_and_sufficient_condition
See my post about the WikiBooks "Serial Programming/Modems and AT Commands" article in this thread: http://www.keil.com/forum/18696/