PRODUCT NAME : GSM MODEM
HARDWARE : SIM 300 MODULE
COMMUNICATION : RS232
COMMANDS : AT
INPUT VOLTAGE : 12VDC / 1AMP
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ANTENNA – PULL THE ANTENNA OUT IF THE SIGNAL IS WEAK
HOW TO TEST!!!!
1. INSERT THE SIMCARD INTO SIM TRAY BACKSIDE
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)
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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
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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