52 SCS Series Manual — P/N 15712:L 7/18/16
The SCS⁄SCE SCS-8L⁄SCE-8L Installation
When the EIA-485 shield is not in conduit: Terminate the shield at the outside of the FACP backbox (ground). Do not allow the shield to
enter or even touch the cabinet. Between Smoke Control Stations, wire-nut multiple shields together outside of the respective enclosures.
Power Supply
Power for the Smoke Control Station is provided via a separate power loop from the control panel which is inherently supervised (loss of
power also results in a communication failure at the control panel). If the SCS-8L is powered remotely, it must be powered by a Power Lim-
ited power supply listed for fire protective signaling and there must be a common connection between the negative battery terminals of each
supply. Use of the RPT-485 isolator/repeater in the control panel to isolate the EIA-485 line eliminates the need for the common connection
between power supplies.
Enclosure
SCS-8L
Terminal Block
Figure 3.25 Terminating the Shield
NOTE: All enclosures, including the FACP backbox, must be connected to earth ground! Never use the shield for grounding purposes.
Terminate the EIA-485 shield at the Fire Alarm Control Panel only.
EIA-485 In (–)
EIA-485 Out (–)
EIA-485 Out (+)
EIA-485 In(+)
Not Used
Not Used
Common In (–)
Common Out (–)
Power In (+24 VDC)
Power Out (+24 VDC)
Earth Ground
TB2
TB1
Figure 3.26 SCS-8L Terminal Blocks
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