Itron FNCCU4 User Manual
T
CCU4 Collector
Field Installation and Service
Guide
D R A F T !
Identification
CCU4 Collector Field Installation and Service Guide
TDC-0359-000b 04/02
Trademark Notice
Itron is a registered trademark of Itron, Inc.
All other product names and logos in this manual are used for identification purposes only and may be trademarks or
registered trademarks of their respective companies.
Copyright Notice
Your company has the right to reproduce this contract document provided that such reproduction shall be subject to the
same use and disclosure restrictions contained in the Confidentiality and Non-Disclosure paragraphs in the Sales Contract.
© Copyright 2002 Itron, Inc. All rights reserved.
Compliance Statements
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and , if not installed
and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur
in a particular installation.
If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged
to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio or TV technician for help.
Warning
It is important that only authorized Itron personnel attempt repairs on Itron equipment as this might void any maintenance
contract with your company. Unauthorized service personnel might be subject to shock hazard on some Itron equipment
if removal of protective covers is attempted.
Suggestions
If you have comments or suggestions on how we may improve this document, send them to:
Itron, Inc.; Attention: Technical Communications; 2818 N. Sullivan Road; Spokane, WA 99216.
e-mail: techcomm@itron.com
ii CCU4 Collector Field Installation and Service Guide
TDC-0359-000b 04/02
DRAFT
Contents
List of Figures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
List of Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
How This Book is Organized . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xiii
Chapter 1 CCU4 Collector Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Fixed Network Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
CCU4 Collector Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Upper Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
CDPD Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
POTS Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Communications Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Power Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Central Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Compact Flash Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Receiver and Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Lower Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Battery Pack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Chapter 2 Installation Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
ERT Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Collector to ERT Ratio and Distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Radio Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Installing a Davit on a Wood Pole . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Required Tools and Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Calculating Wind Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Example: Aluminum Light Pole Wind Load . . . . . . . . . . . . . . . . . . . . . . . . . . .10
RF Antenna Angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
DRAFT
Contents iii
Measuring the Mounting Angle of a Pole or Davit. . . . . . . . . . . . . . . . . . . . . . .10
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Unpacking the CCU4 Collector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Packing Lists. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
CDPD Version (part #CCU-4011-001) . . . . . . . . . . . . . . . . . . . . . . . . . . .11
POTS Version (part # CCU-4012-001). . . . . . . . . . . . . . . . . . . . . . . . . . .11
Additional Required Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Chapter 3 Installing the CCU4 Collector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Required Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Installation Procedure Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Installing the Hanging Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Attaching the Collector to the Hanging Plate . . . . . . . . . . . . . . . . . . . . . . . . . .15
Attaching the RF Antenna. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Connecting the Means of Transmitting to the Headend . . . . . . . . . . . . . . . . . .17
Installing the Battery Pack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Supplying Power to the Collector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Connecting the Collector to the Photoelectric Sensor . . . . . . . . . . . . . . . .20
Connecting the Collector to the Secondary Power Wires . . . . . . . . . . . . . .21
Verifying the Collector is Operational. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Chapter 4 Servicing the CCU4 Collector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Field Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Replacing an Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Required Hardware and Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Replacing the Battery Pack. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Required Hardware and Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Replacing the Collector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Required Tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Installation Procedure Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Appendix A CCU4 Collector Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Dimensions and Weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Environmental. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
AC Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Communications Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
CDPD Modem. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
POTS Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
POTS Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
iv CCU4 Collector Field Installation and Service Guide
TDC-0359-000b 04/02
DRAFT
Agency Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Appendix B Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
DRAFT
Contents v
List of Figures
Attaching a Davit to the Wood Pole . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Attaching the CDPD Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Attaching the Collector to the Hanging Plate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Attaching the RF Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
CCU4 Collector Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
CCU4 Collector Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Collector Shown Detached from Hanging Plate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Connecting the Collector to the Photoelectric Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Connecting the Collector to the Secondary Power Wires . . . . . . . . . . . . . . . . . . . . . . . . . 22
Connecting the POTS Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Fixed Network with CCU4 Collector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installing the Battery Pack. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Installing the Hanging Plate on the Light Pole Davit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Measuring the Mounting Angle of a Pole or Davit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
RF and CDPD Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
DRAFT
List of Figures vii
List of Tables
AC Power Cable Wire Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Battery Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
CDPD Modem Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
CDPD Version Packing List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Communications Connector Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Environmental Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
POTS Cable Wire Colors and Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
POTS Cable Wire Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
POTS Modem Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
POTS Version Packing List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Power Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Receiver Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Required Power Cable by Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Transmitter Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
DRAFT
List of Tables ix
List of Procedures
Attach a Davit to a Wood Pole. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Attach the CDPD Antenna to the New Collector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Attach the CDPD Antenna. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Attach the Collector to the Hanging Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Attach the New Collector to the Hanging Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Attach the RF Antenna to the New Collector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Attach the RF Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Connect the Collector to the Photoelectric Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Connect the Collector to the Secondary Power Wires . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Connect the POTS Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Install the Battery Pack in the New Collector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Install the Battery Pack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Install the Hanging Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Reconnect the POTS Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Reconnect the Power Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Remove the Current Collector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Replace an Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Replace the Battery Pack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Verify the Collector is Operational . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Verify the New Collector is Operational . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
DRAFT
List of Procedures xi
Before You Begin
This document describes the physical installation and maintenance of the CCU4 collector at the
site of installation and presumes any pre-installation configurations or modifications have
already been performed at the meter shop. For more information about procedures performed
prior to installation, see the CCU4 Collector Configuration Guide.
How This Book is Organized
• Chapter 1, “CCU4 Collector Overview” describes the features of the collector, its role in
the fixed network, and its individual components.
• Chapter 2, “Installation Considerations” addresses several topics to consider before
installing a CCU4 collector,including avoiding RF interference and calculating wind load.
This chapter also describes installing a davit on a wood pole.
• Chapter 3, “Installing the CCU4 Collector” describes installing the collector either on the
davit of a light pole or on a davit attached to a wood pole. This chapter also describes
supplying power to the collector using either the photoelectric sensor of a light pole or the
secondary power wires of a wood pole.
• Chapter 4, “Servicing the CCU4 Collector” describes replacing the antennas, the battery
pack, and the entire collector.
• Appendix A, “CCU4 Collector Specifications” provides environmental, electrical, and
physical specifications for the collector and its components.
Conventions
DRAFT
• Appendix B, “Troubleshooting” provides possible solutions to problems that may occur
while installing and servicing the CCU4 collector.
Hypertext links are blue.Example:See“Conventions” on page xiii for detailed information.
The last line in a table is defined by a thick gray line. If the table continues on another page, the
table number, title, and column headings are repeated on each page.
Before You Begin xiii
Chapter 1
CCU4 Collector Overview
Itron’s Cell Control Unit 4 (CCU4) collector is a self-contained device that collects energy
consumption and tamper data from Itron Encoder Receiver Transmitters (ERTs) installed on
commercial and residential utility meters, and then forwards this information over public
networks to a central data collection site (the fixed network headend). The collector’s modular
design and ability to read water, electric and gas meter data with the same unit provides a scalable
fixed network solution.
The CCU4 collector is installed outdoors on utility poles and is powered by a 120 VAC power
line. If AC power fails, the collector continues to operate on battery power for up to four hours.
The collector reads ERT Standard Consumption Messages (SCMs) and Interval Data Messages
(IDMs) at preset intervals on the 910-920 MHz unlicensed band (ISM) using a radio frequency
(RF) receiver. It then transmits the data at specified times of day to the headend through existing
telephone lines using a dial-up modem or through wireless transfer using a Cellular Digital
Packet Data (CDPD) modem and antenna. The collector also has a MAS band (952 MHz– 957
MHz) transmitter to excite ERT modules programmed as wake-up devices.
Once configured and installed, the CCU4 collector requires no onsite visits while functioning
normally. Changes to collection intervals or data transmission times, upgrades to software, and
other functions are all configured remotely from the headend. For more information on the
headend, see the Fixed Network 2.0 System Reference Guide.
Features
DRAFT
• Transfers data to the central data collection site over public networks, instead of the
proprietary Itron 1432 MHz network
• Internet Protocol (IP) interface provides access using standard internet-based software
applications
• Advanced digital radio technologies and full duplex radio increases the number of
readable endpoints
• Completely re-programmable from a remote location
• Scalable from a single device covering a few endpoints, to thousands of devices covering
large metropolitan areas
• Modular design allows adding different options to suit the installation and allows
increased functionality in the future
• Provides secure data transfer using standard encryption methods
• Includes 10 Base-T Ethernet interface for configuration, diagnostics, and high speed data
transfer
Chapter 1 - CCU4 Collector Overview 1
Fixed Network Diagram
Fixed Network Diagram
Figure 1 shows the role of the CCU4 collector in the overall fixed network. The collector reads
and stores meter data from water, gas, and electric ERT endpoints. It then transmits this data via
either POTS or the CDPD public network to the headend server.
Figure 1: Fixed Network with CCU4 Collector
Modem
POTS
Headend
Firewall
CDPD
Public Network
CDPD
ERT Endpoints
900 MHz 900 MHz
CCU4 Collector
900 MHz
ERT Endpoints
ERT Endpoints
2 CCU4 Collector Field Installation and Service Guide
TDC-0359-000b 04/02
DRAFT
CCU4 Collector Components
CCU4 Collector Components
The CCU4 collector’s modular design consists of a number of components fixed together to form
a single weatherproof device. The rugged, adjustable mounting bracket secures the device in high
winds and under heavy ice loads. Electrical components are designed into a plastic enclosure that
provides double insulation and a high level of safety while handling the device. All electrical
connections from the collector are fully isolated, meaning it does not require a connection to earth
ground.
If data is transferred over a wireless cellular public network, the collector requires only a power
connection. If data is transferred over a land-based public network, a telephone line or Ethernet
connection is also required.
Figure 2: CCU4 Collector Components
CDPD Antenna
Hanging Bracket
Hanging Plate
Communications
Connector
Power Connector
Battery Case
Upper Housing
Central Housing
Lower Housing
RF Antenna
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Chapter 1 - CCU4 Collector Overview 3
CCU4 Collector Components
Upper Housing
The upper housing contains the public network interface modem and the external power and
communications connectors. Each collector contains either a CDPD modem or a POTS (Plain
Old Telephone Service) dial-up modem, but not both at the same time. The upper housing can be
replaced to change the method of public network access.
CDPD Modem
The CDPD modem provides switched data communication services between the collector and the
service providers internet connection/frame relay. CDPD communication provides two-way,
fully digital, 19.2 KBPS packet data networking services. Due to protocol overhead and security,
the effective data rate for CDPD is between 9 KBPS and 14 KBPS, and will drop during periods
of interference and high network utilization. The antenna for the CDPD modem is integrated into
the top cover of the collector. CDPD service is offered by major cellular vendors in most
metropolitan areas of North America.
POTS Modem
The POTS modem is a dial-up modem operating at up to 56 KBPS. Electrical connection to the
modem is through the same modem interface board as used by the CDPD modem. The modem
is a transformer coupled device, which maintains the electrical isolation of the collector. Dial-up
internet service is offered by Internet Service Providers (ISPs) in most areas of North America.
Communications Connector
The communications connector is a transformer coupled connection (maintaining electrical
isolation) and is used on POTS versions of the collector to transmit data to the headend and
download software through POTS lines. The same connector is used in the meter shop to
establish an Ethernet connection, using different pins, during initial configuration and software
download.
Power Connector
The collector input AC connector is a five position circular 3A/300V connector. Pins 2, 3 and 4
are voided for high voltage line to line clearance. The five position circular connector is mounted
on the collector housing, providing a watertight connection point for external power sources.
Central Housing
The central housing is where the main processor, the compact flash memory, and the power
supply reside. The housing is well shielded to prevent interference with the sensitive radio
section.
Beneath the processor section, in the lower portion of the central housing, are the radio
transmitter and receiver.
4 CCU4 Collector Field Installation and Service Guide
TDC-0359-000b 04/02
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