Campbell RF410 Manual de Instruções descarregar pdf (Página 62)

PakBus Networking Guide

01: 0003 PakBus Address of destination node

01: 0003 via neighbor with PakBus Address (this line not present if

destination is a neighbor)

01: 1.0000 maximum response time in seconds

7.4.3 Communications Verification Interval (CVI)

A PakBus device with neighbor filter verifies its neighbors by sending each of

them a hello message according to the programmed communications

verification interval. If a device in its neighbor list does not communicate for a

period of time equal to 2.5 × the CVI, it will initiate up to 4 hellos and, if no

response, that device is removed from its neighbor list.

A PakBus device passes its CVI during hello exchanges. A beaconing device,

such as a datalogger with a *D18 beacon, passes its beacon interval as its CVI.

A device with neighbor filter simply passes its communications verification

interval.

Any device whose beacon interval happens to be set to zero, passes an infinite

CVI (LoggerNet, NL100, datalogger). The CR205 passes an infinite CVI in

every hello exchange. A non-CRBasic datalogger running a P190, with no

neighbor filter nor beacon, also passes an infinite CVI.

7.4.4 Neighbor Removal

7.4.4.1 Automatic

PakBus devices use the communications verification intervals established in

their hello exchanges to remove neighbors (after 4 attempts) that have not

communicated in some way for a period of time equal to 2.5 × the CVI. To

establish these intervals, both nodes in the hello exchange use the longer of the

two CVIs.

In the case of a PakBus device having a neighbor filter potential neighbor list, if

a neighbor is not heard from (in normal communications) for 2.5 × the neighbor

filter CVI, the device will send a hello command to the neighbor. If the

neighbor answers with a hello response then the neighbor is retained in the

device’s neighbor list, otherwise, it is removed. An unresponsive neighbor

results in randomly spaced (1 to 15 seconds) hellos as the device attempts up to

4 times to preserve its neighbor. This continues until either the device is

removed by the user from the potential neighbor list or until communications is

restored.

Whether the CR10XPB, CR510PB or CR23XPB PakBus device is configured

as a router or a leaf node, it will always try 4 hellos after the 2.5 × CVI expires

before removing a neighbor.

The CR200 Series handle this differently. After the 2.5 × CVI period expires

the neighbor is removed without hello attempts.

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Campbell RF410 Manual de Instruções Página 62