WDS P20 Operating instructions

Installation and Operation Guide
RedundantTransceiver
Chassis
WDS P20

QUICK START GUIDE
Below are the basic steps for configuring a Redundant Station using the WDS P20 Redundant Transceiver
Chassis. Detailed instructions are given in “INSTALLATION” on page 9.
1. Install transceivers (if not shipped installed)
• Remove chassis cover.
• Remove mounting plate.
• Mount transceivers to plate.
2. Connect internal back-up battery (if so equipped) and replace chassis cover.
3. Connect wiring
• Connect to ground, connect antenna(s), connect to data interface, connect to power, and connect any
alarms. Connections are described in “Connecting Wiring” on page 12.
4. Program transceivers
• Plug in HHT to Transceiver A.
• Set Front Panel Radio Selection switch to A.
• Enter
INIT xx20 (where xx is the first two digits of transceiver model number) to configure transceiver
for Redundant Station operation.
• Repeat for Transceiver B.
• Record all parameters on a label and affix the label to the chassis.
5. Configure for repeater operation if desired.
• See the instructions beginning with “Configuring the Redundant Transceiver Chassis as a Repeater”
on page 16.
6. Apply primary power
7. Select the active transceiver
• Set the front panel RADIO SELECTION Switch to A (Transceiver A, no auto switchover), B (Trans-
ceiver B, no auto switchover),or AUTO (automatic switchover).
8. Verify proper operation
• Observe LEDs on rear panel.
• Refer to Table 3 or Table 4 on page 20 for a description of the status LEDs.
• Refine directional antenna headings for maximum received signal strength using the RSSI command.
Remotes must be synchronized with the master station for use of this command.

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TABLE OF CONTENTS
1.0 ABOUT THIS MANUAL ............................................................... 1
2.0 ABOUT THE P-20........................................................................1
2.1 Features ...........................................................................................2
2.2 Chassis Configurations ....................................................................2
2.3 Antenna Port Configurations ............................................................3
2.4 Model Configuration Codes ..............................................................3
2.5 Replacement Parts ...........................................................................4
3.0 GLOSSARY OF TERMS.............................................................. 4
4.0 INSTALLATION PLANNING.........................................................7
4.1 Redundant Transceiver Chassis Used as Master Station ................7
4.2 Redundant Transceiver Chassis Used as Remote Station ...............8
4.3 Redundant Transceiver Chassis Used as a Repeater ......................8
5.0 INSTALLATION............................................................................9
5.1 Redundant Transceiver Chassis Shipment ....................................10
5.2 Installation Overview ......................................................................10
5.3 Installing Transceivers ....................................................................11
5.4 Connecting Wiring ..........................................................................12
5.5 Programming the Transceivers .......................................................14
5.6 Configuring the Redundant Transceiver Chassis as a Repeater ....16
5.7 Mounting the Redundant Transceiver Chassis ...............................17
6.0 INITIAL START-UP.....................................................................18
7.0 TROUBLESHOOTING............................................................... 21
8.0 TECHNICAL REFERENCE .......................................................21
8.1 Replacing Power Supply Modules ..................................................21
8.2 Replacing Other Assemblies ..........................................................21
Copyright Notice
This Installation and Operation Guide and all software described herein
are protected by copyright: Shenzhen Sinsoun Inc,
All rights reserved.
Wireless Data Systems reserves its right to correct any errors and
omissions.

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Operational Safety Notices
The radio equipment described in this guide emits radio frequency
energy. Although the power level is low, the concentrated energy from
a directional antenna may pose a health hazard. When using a gain
antennaof 8 dBi (350-512 MHz)or 12dBi (800-960 MHz), do notallow
people to come closer than 0.5 meters to the front of the antenna when
the transmitter is operating. Using higher gain antennas would mean
increasing this distance accordingly.
This manual is intended to guide a professional installer to install,
operate and perform basic system maintenance on the described radio.
ISO 9001 Registration
Wireless Data Systems' adheres to this internationally accepted quality system
standard.
WDS Quality Policy Statement
We, the employees of Wireless Data Systems, are committed to
achieving total customer satisfaction in everything we do.
Total Customer Satisfaction in:
• Conception, design, manufacture and marketing of our products.
• Services and support we provide to our internal and external cus-
tomers.
Total Customer Satisfaction Achieved Through:
• Processes that are well documented and minimize variations.
• Partnering with suppliers who are committed to providing quality
and service.
• Measuring our performance against customer expectations and
industry leaders.
• Commitment to continuous improvement and employee involve-
ment.
Notice
While every reasonable effort has been made to ensure the accuracy of
this manual, product improvements may result in minor differences
between the manual and the product shipped to you. If you have addi-
tional questions or need an exact specification for a product, please con-
tactour Customer Service Team using the informationat the back of this
guide. In addition, manual updates can often be found on the WDS web
site at
www.sinosun.cn. .
RF Exposure

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1.0 ABOUTTHIS MANUAL
This guide describes:
•Installation planning for a P20 Redundant Transceiver Chassis
•Instructions for installing transceivers in a Redundant Trans-
ceiver Chassis
•Instructionsfor installing a Redundant Transceiver Chassis, and
optionally configuring it as a repeater in a repeater-assisted sys-
tem
•Initial start-up of a Redundant Transceiver Chassis.
Procedures for programming and troubleshooting the internal trans-
ceivers are contained in the Installation and Operation Manual supplied
with the transceivers.
Once the unit has been properly installed, configured and started up,
operation of the P20 Redundant Transceiver Chassis is completely
automatic. Operator actions are limited to observing the rear LED status
indicators for proper operation, and selecting A and B transceivers.
Following installation, we suggest keeping this guide near the equip-
ment for future reference.
2.0ABOUTTHEP20
The P20 Redundant Transceiver Chassis (Figure 1) is a tabletop or
rack-mount unit designed to hold two WDS transceivers, two power
supplies, and a switchover logic board that automatically selects
between transceiver A or B as the active transceiver. (Manual selection
can also be made using a front panel switch.) Within a radio system, this
setup is called a Redundant Station.
Invisible place holder
Figure 1. P20 Redundant Transceiver Chassis

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Thisduplicationoffunctionality means theunitwillcontinue to transmit
data even if a failure occurs in one of the transceivers or power supplies.
This capability is important in many applications where uninterrupted
service is required.
In addition to transmitting error codes to a main station, the Redundant
Transceiver Chassis is equipped with alarm connections on the rear
panel which activate when one of the transceivers reports an alarm con-
dition. These are “dry”alarm contacts that allow the connection of cus-
tomer-supplied alarm equipment such as a lamp or sounding device.
The following WDS transceivers can be used with the Redundant Trans-
ceiver Chassis:
•WDS 4710
•WDS 9710
•WDS 9810
•WDS 24810
When these transceivers are ordered installed in a P20 chassis, the last
two digits of the model number change to 20. For example, when the
WDS 4710 is installed in a P20 chassis, the combination is referred to
as an WDS 4720.
Other WDS transceivers may be compatible with the Redundant Trans-
ceiver Chassis. Contact WDS if you are unsure.
2.1 Features
The Redundant Transceiver Chassis provides:
•Fully redundant capability—Standard chassis contains two
transceivers and two power supplies. Provision for optional
redundant antenna port.
•Automatic switchover to alternate transceiver if a failure occurs
•Optional built-in battery backup for AC-powered units
•Rear panel alarm connections for customer-supplied alarm
equipment
•Tabletop or 19 inch rack-mount installation
•Uses standard WDS transceivers inside
•Rear panel diagnostics connection for each transceiver
2.2 Chassis Configurations
The Redundant Transceiver Chassis can be ordered with or without
installed transceivers to meet customer requirements:

P20P20
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1. No transceivers installed. This configuration allows customers to
install two existing transceivers in the empty chassis to create a
Redundant Station.
2. One transceiver installed. Similarly, this configuration allows cus-
tomers to install an existing transceiver to create a Redundant Sta-
tion.
3.
Two transceivers installed. This configuration provides an immedi-
ately usable Redundant Station for new customers, or for existing
customers who wish to add a Redundant Station without installing
existing transceivers.
2.3 Antenna Port Configurations
The Redundant Transceiver Chassis can be configured with a single
antenna, or with two antennas for continued operation if the primary
antenna becomes damaged or is otherwise inoperative.
1.
Single antenna port. The port is automatically connected to the
active transceiver by an internal relay.
2. Two antenna ports. Each port is connected to one of the transceivers
and to separate station antennas.
2.4 Model Configuration Codes
The configuration details of the Redundant Transceiver Chassis (as
shipped from the factory) can be quickly determined from the model
number label attached to the outside of the chassis. Figure 2 shows the
significance of the model number characters printed on the label.
Invisible place holder
Figure 2. P20 model configuration codes
PACKAGE
1 - 12V DC
2 - 24 V DC
3 - 48V DC
4 - 125V DC
A - 115/230V AC w/battery
B - 115/230V AC w/o battery
ANTENNA PORTS

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2.5 Replacement Parts
Table 1 lists parts available to replace Redundant Transceiver Chassis
components should they fail.
3.0 GLOSSARY OFTERMS
If you are new to radio, some of the terms used in this guide may be
unfamiliar. The following glossary explains many of these terms and
will prove helpful in understanding the operation of the transceiver.
Antenna System Gain —A figure, normally expressed in dB, repre-
senting the power increase resulting from the use of a gain-type antenna.
System losses (from the feedline and coaxial connectors, for example)
are subtracted from this figure to calculate the total antenna system gain.
Bit —The smallest unit of digital data, often represented by a one or a
zero. Eight bits (plus start, stop, and parity bits) usually comprise a byte.
Bits-per-second —See BPS .
BPS —Bits-per-second. A measure of the information transfer rate of
digital data across a communication channel.
Byte —A string of digital data usually made up of eight data bits and
start, stop and parity bits.
Decibel (dB) —A measure of the ratio between two signal levels. Fre-
quently used to express the gain (or loss) of a system.
Data Circuit-terminating Equipment —See DCE .
Data Communications Equipment —See DCE .
Data Terminal Equipment —See DTE .
dBi —Decibels referenced to an “ideal”isotropic radiator in free space.
Frequently used to express antenna gain.
Table 1. Replacement part numbers
Power Supply 03-1143A12 115/230 VAC
03-2613A02 18-36 VDC
03-2613A03 36-75 VDC
03-2613A04 10.5-16 VDC
Switchover Logic Board 03-3306A01
Battery Control Board 03-3362A01
Indicator Board 03-3307A01
Backup Battery 28-1575A03

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dBm —Decibels referenced to one milliwatt. An absolute unit used to
measure signal power, as in transmitter power output, or received signal
strength.
DCE —Data Circuit-terminating Equipment (or Data Communications
Equipment). In data communications terminology, this is the “modem”
side of a computer-to-modem connection. WDS 9810/9820 and 24810
transceivers are DCE devices.
Digital Signal Processing —See DSP .
DSP —Digital Signal Processing. In WDS series xx10 and xx20 trans-
ceivers, the DSP circuitry is responsible for the most critical real-time
tasks; primarily modulation, demodulation, and servicing of the data
port.
DTE —Data Terminal Equipment. A device that provides data in the
form of digital signals at its output. Connects to the DCE device.
Equalization —The process of reducing the effects of amplitude, fre-
quency or phase distortion with compensating networks.
Fade Margin —The greatest tolerable reduction in average received
signal strength that will be anticipated under most conditions. Provides
anallowance for reducedsignal strength dueto multipath, slightantenna
movement or changing atmospheric losses. A fade margin of 20 to 30
dB is usually sufficient in most systems.
Frame —A segment of data that adheres to a specific data protocol and
contains definite start and end points. It provides a method of synchro-
nizing transmissions.
Hardware Flow Control —A transceiver feature used to prevent data
buffer overruns when handling high-speed data from the RTU or PLC.
When the buffer approaches overflow, the radio drops the clear-to-send
(CTS) line, which instructs the RTU or PLC to delay further transmis-
sion until CTS again returns to the high state.
Host Computer —The computer installed at the master station site,
which controls the collection of data from one or more remote sites.
Latency —The delay (usually expressed in milliseconds) between when
data is applied to TXD (Pin 2) at one radio, until it appears at RXD
(Pin 3) at the other radio.
MAS —Multiple Address System. A radio system where a central
master station communicates with several remote stations for the pur-
pose of gathering telemetry data.

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MCU —Microcontroller Unit. This is the processor responsible for con-
trolling system start-up, synthesizer loading, hop timing, and key-up
control.
Microcontroller Unit —See MCU .
Multiple Address System (MAS) —See Point-Multipoint System.
Point-Multipoint System —A radio communications network or
system designed with a central control station that exchanges data with
a number of remote locations equipped with terminal equipment.
Poll —A request for data issued from the host computer (or master PLC)
to a remote radio.
PLC —Programmable Logic Controller. A dedicated microprocessor
configured for a specific application with discrete inputs and outputs. It
can serve as a host or as an RTU.
Programmable Logic Controller —See PLC .
Remote (Station)—A radio in an MAS network that communicates
with an associated master station.
Remote Terminal Unit—See RTU.
RedundantOperation—A station arrangement where two transceivers
and two power supplies are available for operation, with automatic
switchover in case of a failure.
RTU—Remote Terminal Unit. A data collection device installed at a
remote radio site.
SCADA—Supervisory Control And Data Acquisition. An overall term
for the functions commonly provided through an MAS radio system.
Standing Wave Ratio—See SWR.
Supervisory Control And Data Acquisition—See SCADA.
SWR—Standing Wave Ratio. A parameter related to the ratio between
forward transmitter power and the reflected power from the antenna
system. As a general guideline, reflected power should not exceed 10%
of the forward power (≈2:1 SWR).