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Module driver pin jumpers: Applying the Module Pin Jumpers(J10-J12) will allocate Pin 3,4,5 for driving the
module. Removing the jumpers will release the above Pins, and you could connect the driver pins to the other digital
pins on your board to avoid the pin conflict.Read more (http://www.dfrobot.com/forum/index.php?
topic=17186.msg21374#msg21374)
How to drive the GSM Mode via USB port
1. If your module works, the indicator Start LED will light up, this means that the module is running correctly.
The LED marked "NET" is used to drive a network status indication LED.
2. Send the AT commands to the module by using Coolterm (http://freeware.the-meiers.org/CoolTermWin.zip)
(or use the Arduino serial monitor).
N o t e : I f y o u w a n t t o p r o g r a m t h e A r d u i n o , p l e a s e d i s c o n n e c t t h e c o o l t e r m t o r e l e a s e t h e c o m m u n i c a t i o n p
GSM mode & GPS mode Selection
Except using UART selection jumper caps, you could switch GSM and GPS function with the IO pins also. Please
remove the jumper caps connected for hardware UART selection first!
Enable GPS mode & disable GSM mode:
digitalWrite(4,LOW);//Enable GPS mode
digitalWrite(3,HIGH);//Disable GSM mode
Enable GSM mode & disable GPS mode:
digitalWrite(3,LOW);//Enable GSM mode
digitalWrite(4,HIGH);//Disable GPS mode
Network indication
State
Off
64ms On/ 800ms Off SIM908 not registered the network
64ms On/ 3,000ms Off SIM908 registered to the network
64ms On/ 300ms Off PPS GPRS communication is established
SIM908 behavior
SIM908 is not running
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