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NTI
Mini Server Environment Monitoring System
14
Connect a Modem
A USB GSM modem may be connected (ENVIROMUX-3GU) to use to send SMS alert messages to a contact’s cell phone. The
ENVIROMUX-3GU modem will connect to the ENVIROMUX at the “USB Devices” port (either USB Type A connector, it doesn’t
matter which one) . The remaining USB Type A connector on the ENVIROMUX is available for the connection of a USB Flash
Drive for data logging (page 57).
The phone number to be called for each user is configured under “User Configuration-Contact Settings” (page 41).
Note: A Mini SIM card (not included) must be installed in the modem for the modem to send messages. Make sure the
SIM card is for GSM communication (not CDMA) and that it is not locked (some SIM cards are "locked" to search for a
specific IMEI number of the phone to operate).
Figure 12
- Connect a Modem
Cell phone Mini SIM card for GSM modem
A SIM card or Subscriber Identity Module is a portable memory chip used in some models of cellular telephones. It can be thought
of as a mini hard disk that automatically activates the phone (or in this case the GSM modem) into which it is inserted.
SIM cards are available in two standard sizes. The first is the size of a credit card (85.60 mm × 53.98 mm x 0.76 mm). The newer,
more popular miniature-version has a width of 25 mm, a height of 15 mm, and a thickness of 0.76 mm.
Some cellular service providers use Mini SIM cards. Verify with your service provider that their Mini SIM card will work with GSM
/ 3G GSM modems before making a purchase.
Note: The ENVIROMUX-3GU will send SMS messages only. No access to the ENVIROMUX is possible through the
modem.