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Section 14. PakBus Overview
136
14.4.6 Maintaining Links
Links are maintained by means of the CVI (communications verification
interval). The CVI can be specified in each node with DevConfig. The
following
rules
1
apply:
•
If Verify Interval = 0, then CVI = 2.5 x beacon interval*
•
If Verify Interval = 60, then CVI = 60 seconds*
•
If Beacon Interval = 0 and Verify Interval = 0, then CVI = 300 seconds*
•
If a router or master does not hear from a neighbor for one CVI, it begins
again to send a Hello message to that node at the random interval.
Users should base verification intervals on the timing of normal
communications such as scheduled LoggerNet collections or datalogger to
dataloggers communications. The idea is to not allow the verification interval to
expire before normal communications. If the verification interval expires the
devices will initiate hello exchanges in an attempt to regain neighbor status,
increasing traffic in the network.
Note:
During the hello-message, a CVI must be negotiated between two
neighbors. The negotiated CVI is the lesser of the first nodes CVI and 6/5ths of
the neighbors CVI.
14.5 Troubleshooting
Various tools and methods have been developed to assist in troubleshooting
PakBus® networks.
14.5.1 Link Integrity
With beaconing or neighbor filter discovery, links are established and verified
using relatively small data packets (Hello messages). When links are used for
regular telecommunications, however, longer messages are used. Consequently,
a link may be reliable enough for
discovery
but unreliable with larger packets.
This condition is most common in radio networks, particularly when max packet
size is >200.
PakBus® communications over marginal links can often be improved by
reducing the size of the PakBus® packets. Best results are obtained when the
maximum packet sizes in both nodes are reduced.
1
During the hello-message, a CVI must be negotiated between two neighbors.
The negotiated CVI is the lesser of the first nodes CVI and 6/5ths of the
neighbors CVI.
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: ......