Reference Manual
Table Of Contents
- Preface
- 1. Overview
- Untitled
- 2. Equipment
- 3. Installation
- 4. Basic Radio Programming and Setup
- 4.1. Define the Network Type and the Radio's Role in that Network
- 4.2. Establish Communication with Instrumentation and Computers
- 4.3. Establishing Communication with Other Radios in the Network
- 4.4. Set the Data Transmission Characteristics
- 4.5. Set Radio Passwords
- 4.6. Set the Hop Table Size in the Terminal Interface
- 4.7. Set the Radio to a Single Channel in a Terminal Emulator
- 4.8. Set the Radio to Hop Channels
- 4.9. Edit Frequencies for Multiple Channels
- 5. Configure Point-to-MultiPoint Networks
- 5.1. Point to MultiPoint Network Characteristics
- 5.2. Point-to-MultiPoint Network Quick Start (Terminal Interface)
- 5.3. Overlapping MultiPoint Networks
- 5.4. Establishing Communication with Other Radios in a MultiPoint Network
- 5.5. Routing Communication Through the Network
- 5.6. Setting Other MultiPoint Parameters
- 5.7. Reading Diagnostics in Tool Suite
- 6. Configure Point-to-Point Networks
- 7. View Radio Statistics
- 8. Release Notes
- 9. Additional Radio Information
- Appendix A: Technical Specifications
- Appendix B: RF Board Pin-Out
- Appendix C: RS232 Pin Assignments - DB9
- Appendix D: LRS455 Frequency Table
- Appendix E: Factory Default Settings
- Appendix F: Point-to-MultiPoint Operation LEDs
- Appendix G: Point-to-Point Operation LEDs
- Appendix H: FreeWave Legal Information
- Blank Page
- Blank Page
1. Overview
LUM0020CD Rev June-2020 Page 11 of 112 Copyright © 2019FreeWave
This document is subject to change without notice. This document is the property of FreeWave Technologies, Inc.
and contains proprietary information owned by FreeWave. This document cannot be reproduced in whole or in
part by any means without written permission from FreeWave Technologies, Inc.
one Repeater. As with a Repeater in a Point-to-Point network, adding a Repeater to a network
cuts the data throughput by half.
It is important to note the differences between Point-to-Point and MultiPoint networks. In a Point-
to-Point network all packets are acknowledged, whether sent from the Master to the Slave or from
the Slave to the Master. In a MultiPoint network, you determine the number of times outbound
packets from the Master or Repeater to Slaves are sent. The receiving radio, Slave or Repeater,
accepts the first packet received that passes the 32 bit CRC. However, the packet is not
acknowledged. On the return trip to the Master, all packets sent are acknowledged or
retransmitted until they are acknowledged. Therefore, the return link in a MultiPoint network is
very robust.
Traditionally, a MultiPoint network is used in applications where data is collected from many
instruments and reported back to one central site. The architecture of such a network is different
from Point-to-Point applications. The following parameters influence the number of radios that
can exist in a MultiPoint network:
1. Size of the blocks of data. The longer the data blocks, the fewer number of deployed Slaves
can exist in the network.
2. Baud rate. The data rate between the radio and the device to which it is connected could
limit the amount of data and the number of radios that can exist in a network
3. The amount of contention between Slaves. Polled Slaves vs. timed Slaves.
4. Use of a Repeater. Using the Repeaters setting in a MultiPoint network decreases overall
network capacity by 50%.
Example: If the network polls Slaves once a day to retrieve sparse data, several hundred Slaves
could be configured to a single Master. However, if each Slave transmits larger amounts of data or
data more frequently, then fewer Slaves can link to the Master while receiving the same network
performance. When larger amounts of data are sent more frequently, the overall network bandwidth
is closer to capacity with fewer Slaves.
For examples and additional information about data communication links, see the Data
Communication Links section.
LRS455A-C, LRS455A-CE, LRS455-T
User-Reference Manual