LMU-2x20™ Hardware and Installation Guide
V1.0.10
December 12, 2010
Copyright ©Calamp Wireless Networks Inc 2010
- 47 -
CalAmp Proprietary & Confidential
4.5
Installation Verification
In many cases it is desirable to verify that an installed LMU-2x30™ is working properly.
That is, installers should verify that the GPS and communications functions of the LMU-
2x30™ are working properly before departing the installation site. In more robust cases,
some key configuration settings such as the Inbound Address and URL should also be
verified.
Note that these processes are all based on issuing AT Commands to the LMU-2x30™. It is
expected that installers will have access to a serial port expansion cable and a laptop or PDA
capable of a terminal connection. Alternatively, an SMS message can be sent to an LMU-
2x30™ to obtain its current status.
4.5.1
Comm Verification
Installers should first verify that the LMU-2x30™ has been acquired and has registered to
the wireless network. This may be verified in one of two ways. First, installers may look at
the Comm LED (i.e., the one closest to the SMC antenna connector). If this LED is solid,
then the LMU has registered to the network and established a data session.
If the LED is not visible, then Comm may be verified using an AT Command:
AT$APP COMM?
Depending on the wireless network being used, one of the following responses should
appear:
GSM RSSI:-69 Comm
If any of the responses return
Not-Acquired
or
Not-Registered
, the wireless
network operator should be contacted for further troubleshooting.
Please note that it may take several seconds for the LMU-2x30™ to communicate with the
modem and acquire the wireless network.
