User's Manual
Table Of Contents
- Copyright
- Disclaimer
- Emissions
- _
- Table of Contents
- _
- TS4000 Overview
- _
- Configuration Program
- _
- Serial Port
- _
- Radio Setup
- _
- AirNet Packet Protocol
- Overview
- Configuration Options
- Control and Status Strings
- Master-Slave System Setup
- Polled System with Store and Forward Repeaters
- CSMA System Setup
- _
- GPS Configuration
- _
- Testing
- Remote Diagnostics
- Upgrading Firmware
- _
- Licensing
- _
- Service and Support
- _
- Warranty
- _
- Appendix A - Serial Ports
- _
- Appendix B – ASCII Character Set
- _
- _
- Appendix C – Control and Status Strings
- _
- Appendix D – Internal Jumper Block
- _
TS4000 Radio Modem User’s Manual AirNet Packet Protocol 48
Configuration Parameter Setting
Remote Sites - that reliably hear both repeaters
Modem Address: Individual
10+ (each remote must have a unique
address)
CSMA MAC Setup: Data Pkts: Min Idle Slots 2
Remote Sites – that hear only one of the repeaters
Modem Address: Individual
10+ (each remote must have a unique
address)
CSMA MAC Setup: Data Pkts: Min Idle Slots Base packet transmit slots + Largest Relay
Pkt: Min Idle Slot
Remote Sites – that hear only the base
Modem Address: Individual
10+ (each remote must have a unique
address)
CSMA MAC Setup: Data Pkts: Min Idle Slots (2 x Base packet transmit slots) + Largest
Relay Pkt: Min Idle Slot
Equations:
Base packet transmit slots = Packet Transmit Time / Slot Time
Packet Transmit Time = {9 * [Max Outbound Message Length (in bytes) + 14] * Overhead / Air Rate (in
kbps)} + Radio Tx Attack Time (in ms)
Overhead = 1 if Coding (FEC) is Unchecked
Overhead = 1.5 if Coding (FEC) is Checked
Slot Time = 1.5 * Radio Transmit Attack Time
Example: Remote Sites – that hear only the base:
Max Message Length for Modbus protocol = 255 bytes
Radio Tx Attack Time = 20ms (this value can be read on the Radio Hardware Screen)
Air Rate = 9.6 kbps (this is configured on the Radio tab)
Coding = Unchecked (this is configured on the Radio tab)
Largest Relay Pkt: Min Idle Slots = Repeater B: Relay Pkts: Min Idle Slots = 1
Slot Time = 1.5 * 20ms = 30ms (this is configured on the Packet General tab)
Packet Transmit Time = [9 * (255 + 14) * 1 / 9.6] + 20 = 273ms
Base packet transmit slots = 273/30 = 10 (rounded up from 9.1)(this value must be rounded up)
CSMA MAC Setup: Data Pkts: Min Idle Slots = (2 x 10) + 1 = 21