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PakBus Networking Guide

message back to the beaconing device. The beaconing device answers with a

hello message to the CR200 Series device which returns a hello response

message and they become neighbors. Discovery begins quickly for CR200

Series devices but it may take several beacons for all to be discovered

depending on the quantity.

3.4.2 CR10X/CR510/CR23X PakBus Datalogger

Since beacons are packets of data, the more devices that beacon, the more

significant the overhead in the communications channel. Also, in networks of

more than a half dozen or so PakBus devices with RF400 Series radios, the

random collisions/retries resulting from beacons and beacon responses can

produce significant delays. If the number of PakBus devices and the size of

data collections is small there will be a relatively low incidence of

collisions/retries. With larger numbers of PakBus devices or higher data

collection rates or amounts, the use of neighbor filters in routers to eliminate

beacons can improve data throughput.

3.4.2.1 Beaconing

A CR10X/CR510/CR23X PakBus device waits a random 1 to 4 seconds after

hearing a beacon before sending a hello response, so the probability is high that

the response will get through.

Once they become neighbors, a beacon could collide with other

communications taking place, so success depends upon the rate of beaconing

and the rate of other communications. For example, 5 minute scheduled data

collection and 1 minute beaconing should work if data collection takes less than

1 minute. If a beacon should happen to collide, it would probably be heard the

next time.

3.4.2.2 Neighbor Filter Hello-ing

A router’s neighbor filter discovers neighbors while reducing network

collisions by eliminating beacons and only sending a hello message to listed

potential neighbors. After discovery, neighbor filter will send more hello

messages to an established neighbor only when normal communications does

not occur within the communications verification interval × 2.5.

It should be noted that if one of the listed potential neighbor devices doesn’t

exist or fails, the hello-ing will occur at random intervals until either the failed

device is removed as a potential neighbor or communications is restored.

Removal can be done remotely by sending a program with new Edlog PakBus

Settings. Removal could be done on-site using *D19 on a keyboard display.

3.4.3 Beaconing and Neighbor Filter FAQs

Q1: Will a CR10XPB which has no neighbor filter put a beaconing

LoggerNet (LN) server in its neighbor list?

A1: Yes, whether or not the CR10XPB is in LoggerNet’s device map.

Q2: Will CR10XPB with a neighbor filter put a beaconing LN server in its

neighbor list?

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