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The DCS 400 Expansion Chassis
The DCS 400 expansion chassis uses essentially the same techniques for installing the
cards/modules as is used when installing cards in the DPM 4000. The left-most card (as viewed
from the rear) is always either a DCS 401R controller card, or a DCS 405R extension card. The
DCS 405R cards are used to expand from one DCS 400 chassis to another. The way this works
is that the DCS 405R is the last card in the first DCS 400 chassis (the one with a DCS 401R card
in the left-most slot). The first card in the expansion DCS 400 chassis is a DCS 405R. Cables are
attached between the two cards. While most installations do not require expansion chassis, there
are times when the number of cards under the control of a single DCS 401R exceeds the ten card
limit of a DCS 400 chassis. Relay Wiring DCS 408/409 and DCS 408R/409R relay cards are used
for a variety of applications in the ProAnnounce™ system. One of the primary uses for them is
the control of line or speaker level audio. The DCS 409/409R is used for low voltage and line
level audio signal switching. The DCS 408/408R is used for high voltage and speaker level audio
signal switching. Both cards ship with a number of wire jumpers installed to create a common
buss. Depending on your needs the cards may work without the need to remove any of the
jumpers, however some applications will require that you do so. Complete isolation of the relays
is possible if all of the buss jumpers associated with that relay are removed.
BGM and Paging System Designs
The following pages show a variety of system examples using all of the components we have
talked about in the preceding pages. These systems are practical, real world, examples you can
adapt and use for your own installations.
ElectroVoice/Dynacord BGM Guide Page 27