Campbell RF410 Manual de Instruções descarregar pdf (Página 60)

PakBus Networking Guide

Once nodes establish themselves as neighbors, if a node does not hear from the

other (either by beacon or by addressed communication) within the

communications verification interval established in the hello exchange × 2.5,

then that node will issue a hello message (up to 4 times if unsuccessful) and

delete that node from its neighbor list if the hello message is not answered.

A node will ignore a certain neighbor device’s beacons and only listen to

addressed communications from that device if the node’s own beacon interval

is more than 3 times the neighbor device’s beacon interval.

A node always responds to a directed packet, even though it may not come

from a neighbor.

If the beaconing device is a potential neighbor of a certain device with neighbor

filter, that device will respond.

A non-beaconing node can initiate a hello message to a beaconing node unless

the non-beaconing node has a Neighbor Filter (and the beaconing device has

the normal PakBus Address < 4000). This is so that a beaconing node can be

sure to discover a non-beaconing node.

Beacon Interval

You configure LoggerNet’s beacon interval by clicking on “PakBusPort” in the

Setup device map. To set a datalogger’s beacon interval you use *D18 with the

keyboard/display or Edlog’s Options, PakBus Settings. If the datalogger is

already programmed for beaconing you will see a non-zero value in *D18

window 01, 02, 03, or 04. The window to which you input the beacon interval

selects either a CSDC 7, CSDC 8, Modem Enabled, or RS-232 port for the

beacon. You program an NL100’s beacon interval in NL100 Edit mode using

Telnet (see NL100 manual for details).

When doing scheduled collections, the rule-of-thumb is to make the beacon

interval less than the scheduled collection interval. However, to minimize

beacon caused delays in the middle of large data transfers, the LoggerNet

beacon interval should be greater than the time it takes LoggerNet to collect

each scheduled collection. For example, 5 minute scheduled data collection and

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

7.4.2 Neighbor Filter

A way to discover neighbors without beaconing is to set up Neighbor Filter

potential neighbors. Knowing who a datalogger’s neighbors are going to be,

you can list them. You can include these settings in the datalogger’s program

using Edlog’s PakBus Settings, or directly using *D19. When you set up a

neighbor filter the datalogger will send a hello message to each potential

neighbor. If the potential neighbor responds it will be put in the datalogger’s

neighbor list.

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 123 124

Sem comentários

Campbell RF410 Manual de Instruções Página 60