Neptune Technology L900 MIU Pit, Installation And Maintenance Manual, Page: 16 / 42

The fixed network message that transmits for use on a LoRa network is sent every
three hours.
The L900 MIU is designed to offer advantages to utility organizations of all sizes:
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Increases meter reading accuracy.
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Eliminates infrastructure concerns and the burden of managing collection
devices.
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Eliminates “hard-to-read” meters.
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Protects utility liability by increasing meter reader safety.
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Requires no programming.
Product Description
This section gives an overview of the L900 MIU.
L900 MIU Programming
The L900 MIU does NOT require field programming.
RF Protocol Error Detection
The RF protocol is comprised of a header, data packet, and an error detection
mechanism that reduces the erroneous data.
RF Frequency Control Algorithm
The L900 MIU’s frequency-hopping, spread-spectrum has a sequence of at least 50
different channels for transmitting data. Associated with the 50 channels are 50
frequencies that can be pre-selected in a pseudo random manner. These 50
frequencies are coded into the software.
The L900 MIU avoids 914 MHz to prevent collision with the Advantage probe.
RF Transmission Period and Randomness
The random period generation uses the same random seed created for the channel
definition to generate the transmission randomness. The randomness algorithm is
defined so that no two consecutive transmissions from two L900 MIUs interfere
with one another.
Low Battery RF Emissions
The L900 MIU stops RF transmissions when the battery discharges below the
normal operating voltage.
2 L900 MIU Pit and Wall Installation and Maintenance Guide
Chapter 1: Product Description