3-Axis Accelerometer Input; Outputs - Cal Amp LMU-2 30 Series Hardware And Installation Manual

LMU-2x20™ Hardware and Installation Guide

4.4.2 3-Axis Accelerometer Input

The LMU-2x30™ supports an internal 3 Axis Precision Accelerometer as one of its discreet
inputs. When the LMU is moved in any direction, the associated input will be in the High
state. If the LMU's accelerometer does not detect motion, then the input will be in the Low
state. No external connections are required for this functionality to be operational.

4.4.3 Outputs

The LMU'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.
LMU
V1.0.10
Copyright ©Calamp Wireless Networks Inc 2010
Vehicle Power
(+12VDC)
Relay
Output 0
Ground
Figure 22 - Sample Relay Wiring
- 45 -
Relay
86
Coil
85
CalAmp Proprietary & Confidential
87
Relay
Contacts
30
December 12, 2010