User's Guide

Model: VSM3
9
Positioning Universal, Inc. - Confidential & Proprietary
2.3 LED Indicators
There are 3 indicator LEDs on the device, which are used to indicate the status of cellular
communications and GPS, and to indicate when messages are created and transmitted.
The orange LED indicates communications status:
● Off indicates modem is off
● Slow blinking indicates no PDP session is active – searching for cell signal
● Fast blinking indicates network available
● Alternate Solid & Fast blinking indicates registered on network, no
acknowledgement
● Solid indicates registered, with acknowledgement and active PDP session
The white LED indicates GPS status:
● Off indicates GPS is off
● Slow Blinking indicates searching for GPS signal
● Fast blinking indicates GPS time sync
● Solid indicates a good quality GPS fix
The green LED indicates serial status:
● Off indicates no DS4 device communication
● Solid indicates a good serial connection with DS4 unit