EIA-485 Shield Termination
Shield Not in Conduit
27
Document 51338 Rev. B 08/24/05 P/N 51338:B
5.1
Shield Not in Conduit
The EIA-485 line allows the FACP to communicate with the LCD-80F
Annunciator. The shield for the EIA-485 line must be connected to earth
ground at the FACP but must be left floating (no connection) at the
annunciator if it is the first or only device on the EIA-485 line. If a
second annunciator is connected, the shield leaving the first annunciator
must be left floating. The shield entering the second annunciator must
be connected to the three-gang box or Earth Ground terminal (P2-7) on
the second annunciator. If additional annunciators are connected, the
shield leaving each enclosure must be left floating and the shield enter-
ing each must be connected to the three-gang box or the Earth Ground
terminal (P2-7) on the annunciator.
EIA-485 Loop
not in conduit
Shield
Figure 5-1:
EIA-485 Without Conduit
Connect the drain wire to the outside of the
FACP cabinet via a BX-type connector.
Shield Drain Wire
FACP Backbox
(+) EIA-485
(-) EIA-485
FACP
LC
D80
F
sh
l.cdr
FACP
annunciator
annunciator
annunciator
