8/18/2021
LMU-2600 Hardware & Installation Guide - PULS Wiki
https://puls.calamp.com/wiki/LMU-2600_Hardware_%26_Installation_Guide
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the vehicle power input level (typically 12 VDC). Their input impedance is approximately 10k . One of these
inputs is dedicated to sensing the vehicle’s ignition status to provide for flexible power management. The
other two inputs may be used to sense vehicle inputs such as cooling unit operation, a hidden driver “Panic”
switch, taxi on-duty/off-duty meter status or many others.
The ignition input is pulled to ground through the 10k resistance, where the other inputs can either be
normally High (i.e. pulled to +12v through a 10k resistor) or Low (i.e. pulled to ground through a 10k
resistor). Input 1 is always biased low, inputs, 2-4 are biased high The diagrams below show how to connect
the inputs in both a high- and low-biased configuration:
