9/27/2017
LMU-3640 Hardware & Installation Guide - PULS Wiki
https://puls.calamp.com/wiki/LMU-3640_Hardware_%26_Installation_Guide
10/23
The ignition input is pulled to ground through the 10k resistance, where the other inputs can be configured to be normally High (i.e. pulled to
+12v through a 10k resistor) or Low (i.e. pulled to ground through a 10k resistor). The diagrams below show how to connect the inputs in both a
high- and low-biased configuration:
LMU-3640™ Input Wiring
3.4.3
Outputs
The LMU’s and ioPOD;s outputs are designed to drive external relays. These outputs provide a high-current, open-collector driver that can sink up
to 150 mA each. These drivers may be used to drive external relays that can then control vehicle functions such as door locks, fuel shut-off valves,
sirens and lights. If additional current is required to drive the relays, external circuitry can be added to source the current. This diagram is a typical
use of an output to drive a relay.
Sample Relay Wiring
3.4.4
Status LEDs
The LMU-3640™ is equipped with 3 Status LEDs; one for GPS, one for COMM (wireless network status), one for GPS, and one for WiFi. The
LEDs use the following colors to indicate service:
Status LEDs