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Hi gl1...
I recommend SIMCOM modules, i've been working with them and only 1 gsm module came bad. And they also are easy to implement (and cheap XD). Thats my suggestion... Good luck with your project. >Rod_O
as said above you can go for SIMCOM if it is a hobby project... But go for simpler version of SIMcom like SIMCOM 300 or less than that, instead of going for SIMCOM900 or 450 series..
if you need a stable and good modems then go for wavecom modem. ( Now under the banner SIERRA wireless).
Yes, sim548C it's a very good moddule, but it's not under production any more, the replacement for that module is now sim 908.
And the same happend with sim 300C, its out of production, and the replacement would be sim900.
Im just saying this in case you need more modules in the future, so you dont have to redesign everything (that happend to me XD )
Good Luck !
>Rod
Hi Guys,
I am located in Ireland, I am looking into Simcom module from NSK as you have advised.
IS it easy to interface to PIC, Does SIM 300 module require programming before using in application?
Is unit ready for use once a Sim card has been applied and Power to Unit.
Any little help is much appreciated?
Sim300 and oder simcom's modems don't require programing before use.
Yes, it's redy tu use with sim card, power supply, anntena and pwr button.
It's easy to interface with microcontrolers by USART (even null-modem connection). It's hard to write some kind of syntax analyzer for standalone device as GPS real time tracker.
Thanks for advice namloc
I only wish to use the SMS function of the SIM300 device. i.e. send receive special text messages
I do not want to connect Speaker, mic etc etc,
Can i connect to my Micro in the following format... No Hardware Handshaking i.e. just connect Tx-Rx and ground wires
Is there special configuration i need to do to SIM300 to Receive or Transmit text messages?
Would you have an example communication of a Text Message Reception and Transmit?
Try to write usart communication with PC. It would be better if you write it yoursefl and ask questions with code that you made.
Download PIC datasheet and read it. There will be examples there.
The programming is not my concern for now, I want to understand the Interface from SIM300 to PIC USART.
Can i use only TX-RX and Ground?
Or does SIM300 module require full USART implenentation with all handshaking etc etc
I am used to programming PIC for serial communications, via serial port on PC etc etc
Can I use same method here, or do I have to use asynchronous instead of serial method of comms between SIM300.
*Try to recive messages from sim300d,for example:
When you will call to your gsm modem it wil send you "RING <CR><LF>" message.
Try to detect this message and send reply message "ATH <CR><LF>" to disconnect incoming call.
RING - someone is calling
ATH - disconnect existing connection
CR LF - Carridge return, Linefeed
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