Installation guide

LMU Users Guide
V1.0.6 December 10 2009
Copyright ©CalAmp DataCom Inc 2009
- 114 - CalAmp Proprietary & Confidential
LMU-1000
Truck
Battery
LMU-4100
Power
Ground
Ignition
Input 3
Input 2
Input 1
Truck
Ignition
Trailer
Battery
Power
Ground
Input 2
Input 1
Load Sensor
Unload Sensor
Truck/Trailer
Connector
14.2.4 LMU Setup – Development – LMU 4100™
14.2.4.1 Setting up the Inbound Address
We are once again going to assume we have an LM Direct server at our hosting center using
the IP address of 172.90.80.241. We have gone one step further and set up a URL that will
point this customer’s LMUs to this IP address. The URL is “HagenTrucking.HSIInc.com”.
Our first two setup commands are therefore:
AT$APP INBOUND 172.90.80.241:20500
AT$APP PARAM 2319,0,”HagenTrucking.HSIInc.com”
14.2.4.2 Setting up the Inputs
When working with Inputs, there are really two items you need to consider, the function
(Input or Output) and the Bias (High or Low). Based on our mapping above, we will be
using Inputs 0, 1, 2 and 3. Inputs 0 and 3 are always inputs, so we do not need to worry
about their function. Inputs 1 and 2, however can be either Inputs or Outputs. We want to
make sure they’re Inputs which gives us the following command:
ATS159=0 (i.e. bits 0 and 1 are cleared)
For the Bias, we can again ignore Input 0 since it is always biased Low. The trailer detect
circuit is active Low, that is, Input 3 will be connected to ground when the truck connects to
the trailer and be open circuited when the trailer disconnects This means we will want the
Input biased High.
AT$APP PARAM 1024,38,8,8 (i.e. set bit 3)