NSK FORUM

GSM MODEM


HOW TO TEST!!!!

1. Insert the SIM CARD in Sim Tray

2. CONNECT THE RS232 CABLE TO THE PC SERIAL PORT - SERIAL PORT PROPERTIES ( RESTORE DEFAULTS - 9600 BAUD RATE)

3. OPEN HYPERTERMINAL FROM WINDOWS

START>PROGRAMS>ACCESARIES>COMMUNICATIONS>HYPERTERMINAL

4. SELECT THE COMPORT WITH BAUD RATE 9600

5. TYPE "AT " ECHO "OK" IF ECHO IS OK COMMUNICATION IS OK !!!!!!!!!+


6. CHECK THE LED STATUS ( NETWORK SERCHING , NETWORK CONNECTED, IS SHOWN IN LED STATUS GIVEN BELOW)

Working state of network status indication LED OUTPUT

State SIM300 function

Off SIM300 is not running
64ms On/ 0.8SEC Off SIM300 does not find the network
64ms On/ 3 SEC Off SIM300 find the network
64ms On/ 300ms Off GPRS communication
*****************************************************************************************************************************

TO CHQ GAIN - AT+CSQ=?

TO CHK NETWORK - AT+COPS=?


Examples for send and receive SMS

For sending SMS in text Mode:

AT+CMGF=1 press enter

AT+CMGS=”mobile number” press enter

Once The AT commands is given’ >’ prompt will be displayed on the screen.
Type the message to sent via SMS. After this, press ctrl+Z to send the SMS.
If the SMS sending is successful, “ok” will be displayed along with the message number.


For reading SMS in the text mode:
AT+CMGF=1 Press enter
AT+CMGR= no.
Number (no.) is the message index number stored in the sim card. For new SMS, URC will be received
on the screen as +CMTI: SM ‘no’. Use this number in the AT+CMGR number to read the message.
Voice call
Initiating outgoing call:
ATD+ mobile number; press enter
For disconnecting the active call:
ATH press enter
For receiving incoming call:
ATA press enter



**************************************************USEFUL AT COMMANDS FOR SETTINGS *****************************************************************

TO CHANGE BAUDRATE - AT+IPR=BAUDRATE(Ex 9600) 0-115200 For maore details refer AT commands Document page 33

TO SAVE THE SETTINGS AT&W

TO RESTORE FACTORY DEFAULTS TYPE AT&F THEN SAVE IT AT&W