DAVIS 7627 Installation Manual download pdf (Page 44)

Appendix B

First in Chain Applications

The repeater contains a three-pin header next to the Repeater ID DIP switch that can

enable a repeater with an ID other than A to become the first repeater in a chain if two or

more repeater chains are required in a given network.

First in Chain Description

In most of the examples shown of repeater networks (See “Repeater Architecture” on

page 6 for more information), the examples rely on the principle that the installation is

linear, with a station or group of stations near the first repeater and a receiver near the last

repeater. In some applications, the receiver may be at the center of a group of stations,

with one or more stations requiring the use of a repeater or chain of repeaters. In those

instances, the stations may not be able to share the same repeater chain. The first in chain

functionality allows you to create multiple chains.

All repeaters require a unique ID and are still limited to a combination of eight stations

and eight repeaters, but the first in chain application lets a repeater with a repeater ID

other than A (B, for example) assume first in chain role of repeater A would have while

still having a unique ID.

First in Chain Configurations

Use a first in chain configuration as part of a multiple station/single receiver setup when

the stations are located at a distance so great that they cannot share a repeater or chain of

repeaters and require separate repeaters or chains or repeaters.

The diagram below shows an example first in chain/multiple repeater configuration:

In this example a receiver is in the middle of two station chains, with a station on either

end of the receiver.

The two repeaters used to repeat the second station’s signal are still alphanumerically

ordered, but repeater B assumes first in chain duties and does not look for and try to

acquire repeater A.

Note: Despite the use of first in chain jumpers for one or multiple repeaters, all repeaters still require a sequen-

tial ordering. For example, in the above diagram there are three repeaters in a network. Even though

there are two separate chains, those three repeaters should still have IDs A through C.

1 1 2

2 2

Any Vantage Pro2

Station

Repeater

Vantage Pro2

Console/Receiver

Weather Envoy

Repeater

First In Chain

Repeater

Temperature/

Humidity

Station

1 2 ... 39 40 41 42 43 44 45 46 47 48

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DAVIS 7627 Installation Manual Page 44

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