Campbell Scientific CR3000 CR3000 Micrologger - Page 361
LoggerNet Network-Map Configuration
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Section 8. Operation 8.5.4.2 Ping Hence, the size of the responses to the file-receive commands that the CR3000 sends is governed by the Max Packet Size setting for the datalogger as well as that of any of its parents in the LoggerNet network map. Note that this calculation also takes into account the error rate for devices in the link. BMP5 data-collection transaction does not provide any way for the client to specify a cap on the size of the response message. This is the main reason why the Max Packet Size setting exists. The CR3000 can look at this setting at the point where it is forming a response message and cut short the amount of data that it would normally send if the setting limits the message size. Link integrity can be verified with the following procedure by using PakBusGraph Ping Node. Nodes can be pinged with packets of 50, 100, 200, or 500 bytes. Note Do not use packet sizes greater than 90 when pinging with 100 mW radio modems and radio enabled dataloggers (see the appendix Telecommunications Hardware ). Pinging with ten repetitions of each packet size will characterize the link. Before pinging, all other network traffic (scheduled data collections, clock checks, etc.) should be temporarily disabled. Begin by pinging the first layer of links (neighbors) from the PC / LoggerNet router, then proceed to nodes that are more than one hop away. Table PakBus Link-Performance Gage (p. 361) provides a linkperformance gage. Table 88. PakBus Link-Performance Gage 500 byte Pings Sent Successes Link Status 10 10 excellent 10 9 good 10 7-8 adequate 10
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