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Section 14. PakBus Overview
135
14.4.1 Hello-message (two-way exchange)
A
hello-message
is an interchange between two nodes that negotiates a neighbor
link. A
hello-message
is sent out in response to one or both of either a beacon or
a hello-request.
14.4.2 Beacon (one-way broadcast)
A
beacon
is a broadcast sent by a node at a specified interval telling all nodes
within hearing that a
hello-message
can be sent. If a node wishes to establish
itself as a neighbor to the beaconing node, it will then send a
hello-message
to
the beaconing node. Nodes already established as neighbors will not respond to
a beacon.
14.4.3 Hello-request (one-way broadcast)
All nodes hearing a
hello-request
broadcast (existing and potential neighbors)
will issue a
hello-message
to negotiate or re-negotiate a neighbor relationship
with the broadcasting node.
14.4.4 Neighbor Lists
PakBus® devices in a network can be configured with a neighbor list. The
router or master sends out a
hello-message
to each node in the list whose verify
interval has expired at a random interval*. If a node responds, a hello-message
is exchanged and the node becomes a neighbor.
*A random number of seconds between INTERVAL and (2 * INTERVAL),
where INTERVAL is the Verify Interval setting if non-zero, or 30 seconds if the
Verify Interval setting is zero.
Neighbor filters dictate which nodes are neighbors and force packets to take
routes specified by the network administrator. LoggerNet (a PakBus® node)
derives its neighbor filter from link information in the Setup device map.
14.4.5 Adjusting Links
PakBusGraph, a client of LoggerNet, is particularly useful when testing and
adjusting PakBus® routes.
Paths established by way of beaconing may be redundant and vary in reliability.
Redundant paths can provide backup links in the event the primary path fails.
Redundant and unreliable paths can be eliminated by activating neighbor filters
in the various nodes and by disabling some beacons.
Содержание CR200
Страница 32: ...Section 2 Quickstart Tutorial 22 ...
Страница 45: ...Section 3 Overview 35 3 3 Specifications ...
Страница 46: ...Section 3 Overview 36 ...
Страница 58: ...Section 4 Sensor Support 48 ...
Страница 62: ...Section 5 Measurement and Control Peripherals 52 ...
Страница 78: ...Section 8 CR200 X Configuration 68 ...
Страница 102: ...Section 9 Programming 92 ...
Страница 138: ...Section 11 Programming Resource Library 128 ...
Страница 156: ...Section 16 Support Software 146 ...
Страница 160: ...Section 17 Care and Maintenance 150 ...
Страница 166: ...Section 18 Troubleshooting 156 18 3 3 Diagnosis and Fix Procedures 18 3 3 1 Battery Voltage Test ...
Страница 167: ...Section 18 Troubleshooting 157 18 3 3 2 Charging Circuit Test Solar Panel ...
Страница 168: ...Section 18 Troubleshooting 158 18 3 3 3 Charging Circuit Test Transformer ...
Страница 169: ...Section 18 Troubleshooting 159 18 3 3 4 Adjusting Charging Circuit Voltage ...
Страница 170: ...Section 18 Troubleshooting 160 ...
Страница 184: ...Appendix A Glossary 14 ...
Страница 190: ...Appendix B Status Table and Settings 20 ...
Страница 192: ...Appendix C Serial Port Pin Outs 22 ...
Страница 211: ......