User's Manual

Proximity BUS Reader – Installation Guide
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Page 3 of 6
V10/March 2014
RS-485 BUS/Stub Topology
The RS-485 BUS MUST BE wired using a BUS/Stub topology where the BUS Master (a RF IP Reader or an ELC Controller) is connected
anywhere along the BUS. The topology supports data transmission between the BUS Master and up to 15 Elpas BUS Devices (such as RF or IR
Readers; LF Beacons primary & secondary), Elpas Display Panels and 6x6 I/O Modules using Elpas RS-485 Junction Boxes (P/N: 5-JBA00485).
IMPORTANT NOTE: Only 1 RF IP Reader/ELC Controller and up to 7 RF BUS Readers may coexist together on a single BUS.
200M/650Ft: Max. BUS length 10M/30Ft: Max. Stub length 100 Ohm Termination: Required each end of the BUS.
Recommended Cable/Power Supply Types:
BUS Backbone:
CAT5 solid (4x2x26AWG).
Power: Three twisted pairs
(six conductors) between junction boxes.
Data: One twisted pair (two conductors) between junction boxes.
Power: 16 to 28 VDC/2.5A Limited.
Note: For UL installations use only UL 294 (ALVY) compliant power supplies (see page 4 for details).