Product Description
2 E-Coder)R900i Installation and Maintenance Guide
E-Coder)R900i Programming
The E-Coder)R900i is NOT field-programmable. At the factory, each of the following
items is programmed into the MIU:
• Serial number - Each MIU is given a unique 10-digit serial number/identification
number.
• Time between MIU transmissions - The time between MIU transmissions is set for
approximately 14 seconds. Custom time is not available.
• Meter size and change gear information.
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 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 are
pre-selected in a pseudo-random manner. These 50 frequencies are coded into the soft-
ware.
RF Transmission Period and Randomness
The random period generation uses the same random seed created for the channel defini-
tion to generate the transmission randomness. The randomness algorithm is defined so that
no two consecutive transmissions from two MIUs will interfere with one another.
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