User's Manual

Table Of Contents

R900 Wall and Pit MIU Installation and Maintenance Guide 3

2 Specifications

This section provides you with the specifications for the R900 MIU.

Electrical Specifications

Transmitter Specifications

Encoder Register Interface

Power Lithium battery

Transmit Period • Every 14 seconds - Single register configu-

ration

• Every 11 seconds - Alternate ID #s and

meter readings for two networked register

configurations

Encoder reading ProRead (ARB VI) registers once an hour

E-Coder (ARB VII) registers every 15-minutes

Transmitter Channels 50

Channel Frequency 910-920 MHz

Output Power Meets FCC Part 15.247

FCC Verification Part 15.247

This feature may result in a minor discrepancy between the actual reading on the register and the reading on the hand-

held or mobile unit. The discrepancy results from a time lapse up to an hour between the time the MIU reads the

encoder and the time the MIU is read. This discrepancy will be corrected within the next hour when the MIU takes a

new reading

Supported Encoder Maximum Cable Length

Neptune ARB

300 feet (91 meters)

Neptune ProRead (ARB

VI)

and E-Coder (ARB

VII)

500 feet (152 meters)

Invensys ECR II

and ECR III

®3

200 feet (61 meters)

Networked Neptune ProRead (ARB VI) /

E-Coder (ARB VII)

250 feet (76 meters)

The length, which meets manufacturers’ published specification for wire length between encoder and remote receptacle,

is based on solid 3 conductor wire, 22 AWG.

Only specific formats of ECRIII programming are compatible. Contact Neptune for details.