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SIM900 GSM/GPRS TTL UART Modem - User Manual
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Page 17
GETTING STARTED
1)
Insert SIM card
Open the SIM cardholder by sliding it as per the arrow mark and lift up. Insert the SIM card , so as to align
the chamfered corner suits in card holder .After inserting the SIM card, lock the holder by sliding it to the
opposite direction of arrow mark.
2)
Connect The Antenna
Fix the Supplied RF antenna to the SMA Antennae connector and tighten it by Rotating the Nut (
Never rotate the antennae for tightening ).
3)
Connect the Pins
Connect the GSM modem as per the circuit diagram provided
4)
Power the Modem
Power the modem from suitable power supply, which is having enough current capacity (>1A).
5)
Check the Status of the LEDs
PWR LED
- Red LED will lit immediately
STS LED
- Green LED will lit after 1-2 seconds
NET LED -Blue LED will starts to blink in fast for few seconds(Searching For Network) and
becomes slow blinking once the Modem registers with the Network.
6)
Network LED
The Network LED indicates the various status of GSM module eg. Power on, Network registration &
GPRS connectivity. When the modem is powered up, the status LED will blink every second. After the
Modem registers in the network (takes between 10-60 seconds), LED will blink in step of 3 seconds. At
this stage you can start using Modem for your application.
7)
Baud rate
The Baud rate supported by the modem is between 9600 and 115200. Make sure the host system is set
to the supported baud rate.
The modem automatically sets to the baud rate of the first command sent by the host system after
it is powered up.
User must first send “A” to synchronize the baud rate. It is recommended to wait 2 to 3
seconds before sending “AT” character. After receiving the “OK” response, Your Device and GSM Modem
are correctly synchronized.
So there is no need for setting the baud rate using commands.
Before You Start using the modem, please make sure that the SIM card you inserted support the
needed features and there is enough balance in SIM.!!!
