www.rhydolabz.com
SIM900 GSM/GPRS TTL UART Modem - User Manual
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Download setup file from
www.rhydolabz.com/documents/gps_gsm/gsm_modem.zip
Install the setup file in your PC. Once the installation is completed, open the application from
StartMenu-Programs-Rhydolabz-GSM Modem.
Connect the GSM Modem to a PC Com port using a MAX-232 circuit or TTL-RS-232/TTL-
USB and Power it Up.
Select the Comport* (in the application software) to which GSM modem is connected and Press
the “Connect” button.
Click on the button “Test Modem Communication”. If the connection is OK, the software
displays “GSM Modem OK”.
If you want to send an SMS to another mobile using the modem, type the SMS data and Mobile
Number (Add Country code as prefix) and click “Send SMS” button.
* If the comport number to which the modem is connected does not appear in the software, re-assign the
Comport to an available one.(Can be done in Device Manager- Comport-Properties)
