GSM and GPS Serial Communication Problem
Thu Apr 15 2010, 12:46 pm
for me it work absolutely fine..i had 2 option before..either to use another UC or to use UC wic can have 2 serial ports...
Thu Apr 15 2010, 04:41 pm
great.. really its a great circuit thanks for sharing. it might help many other users on forum. i have tagged i too..
Thu Apr 15 2010, 09:33 pm
Hey
Shezo can you please tell me why has the pin 4 of gsm modems db9 connector been connected to pin 2 of max 232?
Shezo can you please tell me why has the pin 4 of gsm modems db9 connector been connected to pin 2 of max 232?
Mon Apr 19 2010, 03:23 am
Thats because you are Transmitting and Recieving at that DB9 connector for GSM..so u constantly giving it 5V from pin2..in case of GPS its not used because its only transmitting the data..
Tue Sep 21 2010, 05:10 am
But what will happen if the data arrives from both the sources simultaneously ?
Tue Sep 21 2010, 08:07 pm
for that purpose there is Nand gate !! we cannot deal wid simultaneous data !!
Wed Sep 22 2010, 12:37 am
GPS data is repeated every second so if you miss one packet doesnt matter it will come again next second but for GSM its the other case, when you send a command you get a reply in return, so its a lock step way of communication as soon as you get the response switch back to GPS uart.
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