3M TD4i, Installation & Operation Manual

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3M Electronic Monitoring
11
Figure 2: One-Piece GPS Unit LED Indicators
The following three sections explain the One-Piece unit’s LED indication during regular operation.
Additional status conditions indicated by a combination of LEDs are explained in section 2.1.4 LED
Indication During Activation Sequence and section 2.1.5 LED Indication of Vibrate Now Feature.
2.1.1 PWR LED
The PWR LED indicates the status of the One-Piece unit’s battery as explained in the following table.
LED Indication LED Pattern Status Description
   
Flashing green
(once per second)
The One-Piece unit is activated or is in the process of being
activated, and the battery does not need to be charged.
   
Flashing red
(once per second)
The One-Piece unit is activated and the battery needs to be
charged.

Solid green
The One-Piece unit is connected to the charger and the battery
has been completely recharged. You may remove the One-Piece
GPS unit from the charger.

Solid red
The One-Piece unit is connected to the charger and is not yet
fully charged.

LED off
The One-Piece unit is not active or has shut down due to low
battery.
2.1.2 GPS LED
The GPS LED indicates the conditions listed in the following table.
LED Indication LED Pattern Status Description

LED off
During regular operation, the GPS LED is off. There is no
indication to the offender if the device has a GPS fix or not.
   
Flashing red
(once per second)
The One-Piece unit has accumulated 10 minutes of offender
motion in a 60-minute period without receiving a signal from the
GPS satellites.