Home > CalAmp > CalAmp LMU-5541 Telematics Router Installation Guide

CalAmp LMU-5541 Telematics Router Installation Guide

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9/28/23, 4:30 PM

LMU-5541 Hardware & Installation Guide - PULS Wiki

LMU™ Serial Adapter

LMU Serial Cable (Part Number 134364-MDT-SER)

The 134364-MDT Serial Cable has the same features as the 134364 product listed above except the MDT serial cable has an extra feature that allows power voltage

adjustment.

LMU™ Serial Adapter

NOTE: CalAmp previously used the following serial cables. The following two cables are no longer in production. However, these legacy cables are still compatible with

LMU-5541™. Part Number 134364-SER has effectively replaced Part Number 133337-5 while Part Number 134364-MDT has replaced Part Number 133564-1. The

description for the legacy cables are listed below.

Serial Combo Adapter (Part Number 133337-5)

The Serial Combo Adapter is designed to allow laptops, and PDAs to communicate with the LMU-5541™ via a direct serial connection. While using this cable, the LMU-

5541™ will accept AT Commands and act as a modem. No setup of the LMU-5541™ is necessary to use this cable.

Serial Combo Adapter (Part Number 133564-1)

The Serial Combo Adapter is designed to allow laptops, MDTs, barcode readers and other devices to communicate with the LMU-5541™ via a direct serial connection.

While using this cable, the LMU-5541™ will accept AT Commands and act as a modem. No setup of the LMU-5541™ is necessary to use this cable. The 133564-1 also

has switched power capabilities which allow for power to the serial device to be regulated. This cable will allow ‘dumb’ serial devices to use the LMU-5541™ to pass

data to/from a remote application. In general, when in MDT mode, the LMU-5541™ will package any data received over the serial port into a ‘User Message’ and send it

to its inbound address. Any User Messages received from the remote application that have an appropriate Message Type will be passed from the LMU-5541™ to the

dumb serial device. The setup of this mode is controlled by S130 - 139 and is described in detail later in this document.

4.5 Accessories

See the Harness Diagrams page for more information on LMU accessories, and supported products table. Do NOT connect multiple power supplies or multiple grounds to

the LMU-5541 and JPod2. Connecting multiple power supplies or multiple grounds may lead to excessive current draw through the LMU and JPod2.

4.6 RF Connector

LMU-5541™ uses an SMA connector with a 50 Ω impedance.

4.7 I/O Descriptions

The LMU-5541™ provides the following inputs and outputs (I/O):

Digital Inputs

Input 0: Ignition Sense (Always biased low)

Input 1: Generic Digital Input (Biased high or low/ S-158 Bit 1)

Input 2: Generic Digital Input (Biased high or low/ S-158 Bit 2)

Input 3: Generic Digital Input (Biased high or low/ S-158 Bit 3)

Input 4: Generic Digital Input (Biased high or low/ S-158 Bit 4)

Input 5: Generic Digital Input (Biased high or low/ S-158 Bit 5)