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CalAmp LMU Installation

This page contains documentation, notes, and tips for installing a CalAmp LMU.

Note there are two models of LMU: the 2600 series and the 2700 series. The primary difference is that the 2700 includes battery backup.

Documentation

Before installing an LMU, be sure to read the LMU Hardware and Installation Guide in full.

The information in the remainder of this document is intended to supplement that Guide.

The LMU should be installed label-side up for best GPS reception
The LMU accelerometer is self-calibrating (generally within 3 minutes of power-up), so device installation orientation doesn't matter as long as the unit is mounted firmly.

Here are some notes to supplement the Installation Guide…

Page 14 of the Installation Guide shows the pinout for the connector and wire harness. At a minimum, you'll need to connect Power (pin 14), Ground (pin 15), and Ignition (pin 8).
For the inputs, note that Input 1 (pin 3), Input 3 (pin 6), and Input 4 (pin 7) work as you would normally expect - active is high (12V), inactive is low (0V), and the bias is low. Those inputs are good for equipment, such as PTO or Beacon, that is turned off most of the time.
Input 2 (pin 12) works in the electrically opposite manner - active is low (0V), inactive is high (12V), and the bias is high. That input is good for a switch or sensor that is normally turned on and should alert when turned off (grounded).

Pin	Signal Name	Description	Lead Color	Type	Notes
3	IN-1	Input 1 – Digital Input	Blue (22 AWG)	Input	On=High, Off=Low (bias low)
6	IN-3	Input 3	Violet (22 AWG)	Input	On=High, Off=Low (bias low)
7	IN-4	Input 4	Grey (22 AWG)	Input	On=High, Off=Low (bias low)
8	IN-0	Ignition	White (20 AWG)	Input	On=High, Off=Low (bias low). 2-minute GPS updates when On. No GPS updates when Off.
12	IN-2	Input 2 – Digital Input	Orange (22 AWG)	Input	On=Low, Off=High (bias high)
14	VCC	Primary Power Input	Red (20 AWG)	Power	12V Power
15	GND	Primary Ground	Black (20 AWG)	Ground	Ground

Pin	Signal Name	Description	Lead Color	Input or Output
1	GND	Ground	Black (22 AWG)	Ground
2	OUT-0	Output 0 –Started Disable Relay Driver	Orange (22 AWG)	Output
3	IN-1	Input 1 – Digital Input	Blue (22 AWG)	Input
4	TXD	Host TxD	Blue (22 AWG)	Input
5	ADC-1	Analog to Digital Input 1	Pink (22 AWG)	Input
6	IN-3	Input 3	Violet (22 AWG)	Input
7	IN-4	Input 4	Grey (22 AWG)	Input
8	IN-0	Ignition	White (20 AWG)	Input
9	VDD	VDD Reference Output (20-25mA Max)	Orange (22 AWG)	Output
10	OUT-1/BOOT	Output 1 – Digital Output (Open Collector) BOOT Input	Brown (22 AWG)	Input / Output
11	OUT-2	Output – 2 Digital Output (Open Collector)	Yellow (22 AWG)	Output
12	IN-2	Input 2 – Digital Input	Orange (22 AWG)	Input
13	RxD	Host RxD	Green (22 AWG)	Output
14	VCC	Primary Power Input	Red (20 AWG)	Power
15	GND	Primary Ground	Black (20 AWG)	Ground
16	1BB-GND	1 Bit Bus Ground	Black (22 AWG)	Ground
17	1BB-D	1-Bit Bus Data		Input / Output
18	Aux - TxD	Aux Port - Transmit Data	<TBD>	Input
19	Aux -GND	Aux Port - Ground	<TBD>	Ground
20	Aux - RxD	Aux Port - Receive Data	<TBD>	Output