User's Manual
Table Of Contents
- Part A – Preface
- Safety Information
- Revision History
- Important Information
- Compliance Information
- Part B – Feature Overview
- Introduction
- Features and Benefits
- Q Data Radio Range
- Part C – System Topologies & Operating Modes
- System Topologies
- Operating Modes
- Part D – Feature Detail
- Hardware
- Efficiency and Bandwidth
- Connectivity
- Ease of Use
- Security
- Part E – Radio Planning and Design
- Radio Path analysis
- BER & Fade Margin
- Radio Accessories
- RF Feeders and Protection
- Part F – Quick Reference Guide
- Introduction
- Half Duplex Radio - QR450
- Full Duplex Radio - QB450
- Hot Standby Half Duplex Radio - QP450
- Hot Standby Full Duplex Radio - QH450
- LED indicators
- Connecting Antennas
- Communication Ports
- Activating Transmitter
- Factory Default
- Digital I/O
- Connecting to Web User Interface (WUI)
- Resolving Ethernet Connection Issues
- Part G– Quick Start Guide
- Step-by-Step Point to Point Setup
- Step-by-Step eDiags Setup
- System Topology Configuration
- Serial and MODBUS
- Single Frequency (Simplex) Mode
- E-Series Emulation Mode
- Part H – Advanced
- Connectivity
- Ease of Use
- Security
- Part I – Installation & Commissioning
- Optimising the Antenna for Rx Signal
- Commissioning
- Part J – Firmware Updating and Maintenance
- Firmware Updating
- Global Firmware Updating
- Fuse Replacement - QR450
- Part K – Open Source License Acknowledgements
- Part L – Support Options
20 Document Number: 0100SM1401 Issue: 05-15
Host Application to Entry
Point
Entry Point to Remote Remote to RTU
SCADA POLL
SCADA POLL
ARQ ACK
RTU RESPONSE
RTU RESPONSE RTU RESPONSE
SCADA POLL Lost
ARQ ON
Automatic Retry Example
ARQ ON
ARQ ACK
The example below shows the ARQ behavior between a pair of radios when a packet is lost during a transmission (ARQ =1).
SCADA POLL
Acknowledgement wait time
ARQ ON
SCADA POLL
(Automatic Retry)
The radio will wait 500ms for an acknowledgement, before sending an automatic retry. It is recommended
that the SCADA host poll response time out time is configured to be a minimum of 3 seconds.
Part D – Feature Detail