User Manual

CellNet Pit MIU Master Rev. 1.0
04/14/99 3:13 PM
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11. Snap the Battery into the Receiving Clips on the Main Housing.
12. Install the Main Housing on the Mounting Adapter.
14. Install the appropriate color wires to each Terminal Screw (Black to B, Green to G, Red to R).
15. Follow the steps in “Testing the Installation.”
SECTION 3
OPERATING INSTRUCTIONS
At the time of installation, the installer uses the CellNet installation tool to verify that the CellNet-
Ready Pit MIU (ProRead Only) is operating properly. Following the installation, the CellNet-
Ready Pit MIU (ProRead Only) operates automatically and continuously without any type of
human intervention.
SECTION 4
THEORY OF OPERATION
CellNet
®
MIU Programming
The MIU is not field programmable. At the factory, each of the following items are programmed
into the MIU:
LAN Address
- Each MIU is given a unique, numeric LAN address.
Time between encoder register reads
-The time between encoder register reads is one hour.
Time between MIU transmissions
- The time between MIU transmissions is 15 minutes on
average.
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 Transmission Period and Randomness
The random period generation uses the same CellNet ALOHA model to generate the transmit
randomness. The randomness algorithm is defined so that no two consecutive transmissions from
two MIU’s will interfere with one another.
Low Battery RF Emissions
The MIU stops RF transmissions when the battery discharges below the normal operating voltage
of 3.1 volts.