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PakBus Networking Guide

removed from its neighbor list. The same removal procedure will happen in the

other device.

When a network route’s neighbor list changes (either neighbor added or

neighbor removed), it then shares that information with other routers. This

behavior fundamentally drives the network routing process.

A device with a neighbor always has an associated communications verification

interval. If a device has several neighbors, each link has a separate

communications verification interval.

When one device establishes another device as a neighbor, it also learns the

port through which it communicated with that neighbor. Although not

displayed, the com port is included in the device’s neighbor list.

Neighbor List

A PakBus device actively updates its list of neighbors. Regular normal

communications between devices is sufficient to preserve their neighbor status.

If a device hears a directed packet (addressed to the device) from a neighbor

within 2.5 × the CVI, it will not need to otherwise communicate with that

neighbor. If the time expires without hearing from the neighbor, it will initiate 4

hello message exchanges before giving up and removing the device from its

neighbor list.

Whenever a router experiences a change in its neighbor list, it sends its new

neighbor list to other routers in the network enabling them to update their

routing tables.

Part of a neighbor list entry is the com port (02, 17, 18 or RS-232) through

which to communicate with a neighbor. In order to send a packet to a neighbor

you must have not only the correct PakBus Address, but also the correct port

(matching your communication peripheral’s port setting) leading to the

neighbor device.

A “neighbor” is indicated in a *D17 Routing Table by the fact that there is a

single PakBus Address present before the hop metric response time. For

example, if device 0003 is a neighbor to a datalogger, the datalogger’s routing

table will look like this:

01: 0003 PakBus Address of destination node

01: 1.0000 worst case response time in seconds

Although *D17 shows neighbors, in the case of multiple peripherals it does not

show the ports used to access the respective neighbors. The port used is a

function of the P190, neighbor filter, etc. used to discover the neighbor.

7.4 Discovery and Removal of Neighbors

Neighbor filter hello-ing, beaconing or any form of directed communication

(such as P190) can be used to discover a datalogger’s neighbor. This is

followed by a hello-exchange to pass communications verification intervals so

that any unresponsive neighbor can be deleted. The *D18 beacon is the simpler

of the two methods to configure. More setup is required for a *D19 neighbor

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Campbell RF410 Manual de instrucciones Pagina 58

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