Reference Manual
Table Of Contents
- Preface
- 1. Introduction
- 2. Basic Radio Programming and Setup
- 2.1. Setting the Radio's Role in the Network and the Network Type
- 2.2. Establishing Communication with Instrumentation and Computers
- 2.3. Establishing Communication with Other Radios in the Network
- 2.4. Designate the RF Transmission Characteristics
- 2.4.1. 900MHz Channel Select Parameters
- 2.4.2. 900MHz Frequency Key (Golden Setting)
- 2.4.3. 900MHz Frequency Zones
- 2.4.4. High Noise
- 2.4.5. 900MHz Hop Frequency Offset
- 2.4.6. 900MHz Hop Table Size
- 2.4.7. 900MHz Hop Table Version
- 2.4.8. Max Packet Size and Min Packet Size (Golden Setting)
- 2.4.9. MCU Speed
- 2.4.10. Remote LED
- 2.4.11. Retry Time Out
- 2.4.12. RF Data Rate (Golden Setting)
- 2.4.13. RTS to CTS
- 2.4.14. Slave Security
- 2.4.15. Transmit Power
- 2.4.16. Transmit Rate
- 3. Configuring Point-to-MultiPoint Networks
- 3.1. Point to MultiPoint Network Characteristics
- 3.2. Point-to-MultiPoint Network Quick Start
- 3.3. Point-to-MultiPoint Operation LEDs
- 3.4. Overlapping MultiPoint Networks
- 3.5. Establishing Communication with Other Radios in a MultiPoint Network
- 3.6. Routing Communications through the Network
- 3.7. Setting Other MultiPoint Parameters
- 3.7.1. 1 PPS Enable Delay
- 3.7.2. Diagnostics
- 3.7.3. DTR Connect
- 3.7.4. Local Mode
- 3.7.5. Master Packet Repeat
- 3.7.6. Master Packet Repeat in MultiPoint Networks with Repeaters
- 3.7.7. Max Slave Retry
- 3.7.8. Radio ID
- 3.7.9. Radio Name
- 3.7.10. Repeaters
- 3.7.11. Repeater Frequency
- 3.7.12. Retry Odds
- 3.7.13. Slave / Repeater
- 3.8. Conserving Power
- 3.9. Reading Diagnostics in Tool Suite
- 4. Configuring Point-to-Point Networks
- 5. Advanced Programming
- 6. Viewing Radio Statistics
- 7. Approved Antennas
- 8. FGR3 Wireless Data Radios Pinouts
- 9. Troubleshooting
- 10. FGR3 Release Notes
- Appendix A: FGR3 Technical Specifications
- Appendix B: FGR3 Board Level Mechanical Drawing
- Appendix C: 900MHz Factory Default Settings
- Appendix D: 900MHz Channel Frequency IDs
- Appendix E: FreeWave Legal Information
3. Configuring Point-to-MultiPoint Networks
FGR3
User-Reference Manual
LUM0110AA Rev Jan-2019 Page 83 of 143 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.
Retry Odds
Setting Description
Description: While packets transmitted from the Master to the Slave radios in a MultiPoint
network are not acknowledged, packets transmitted from Slaves to the Master are
acknowledged.
It is possible that more than one Slave attempts to transmit to the Master at the
same time. Therefore, it is important that a protocol exists to resolve contention
for the Master between Slaves in the network.
This is addressed through the Max Slave Retry (on page 80) and Retry Odds
parameters.
l After the Slave has unsuccessfully attempted to transmit the packet the
number of times specified in the Max Slave Retry parameter, it attempts to
transmit to the Master on a random basis.
l The Retry Odds parameter determines the probability that the Slave attempts
to retransmit the packet to the Master; a low setting assigns low odds to the
Slave attempting to transmit.
l Conversely, a high setting assigns higher odds.
Example: Consider two different Slave radios in a MultiPoint network,
one with a strong RF link and the other with a weak RF link to the
Master.
If a Slave has a weak or poor link, set the Retry Odds parameter to 0
as it may become a chatty Slave and lockup the network, causing a
loss of communication.
l When the Retry Odds parameter is set to 0, after the Slave has exhausted the
number of retries set in the Max Slave Retry parameter and still not gained the
Master’s attention, the Slave’s data buffer is purged.
FREEWAVE Recommends: A Retry Odds parameter set to 0 is
recommended for most networks.
3.7.13. Slave / Repeater
Slave / Repeater
Setting Description
Default Setting (0) Disabled
Options (0) Disabled
(1) Enabled
Terminal Menu (5) MultiPoint Parameters > (A) Slave/Repeater