DAVIS 7627 Installation Manual download pdf (Page 45)

Changing First In Chain Jumper Position

Note: Any repeater with ID A or that does not need to be a first in chain repeater should have the first in chain

jumper left in the default position.

To change a repeater to first in chain:.

1. Remove the black jumper from the top two pins of the first in chain

header

2. Replace the black jumper onto the bottom two pins of the first in

chain header.

Verifying Communication with a Transmitter and

Repeaters

Always start verifying communication at the beginning of each chain, (repeater A, or any

repeater whose jumper position has changed to make it the first in chain). Once commu-

nication between the first in chain repeater, a station, and the subsequent repeaters has

been established, repeat this process for every repeater in the next chain.

See the diagram on the last page of this chapter (“First In Chain Topology with Switch

and Jumper Positions” on page 45)for the transmitter DIP switch settings, repeater DIP

switch settings, and first in chain jumper settings for each repeater in a two chain net-

work.

The process for setting up repeaters and verifying communication between stations and

repeaters is the same for a daisy chain installation (see “Multiple Repeater (Daisy-Chain)

Installation” on page 20) or combination network installation (see “Combination Net-

work (Multiple Transmitters/Repeaters) Installation” on page 26) except for the number

of chains involved and the position of the first in chain jumper on the header.

In the diagram, repeaters A and C are set up and installed exactly as they have been in

previous installations, with the first in chain header remaining in the default position.

However, Repeater B has the first in chain jumper switched to the ON position so that it

is the first repeater in a second chain.

Default

(Normal)

Position

First in Chain

Position

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DAVIS 7627 Installation Manual Page 45