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Existing Interference
Interference from RF and electrical sources can degrade system performance and must also be considered
in the site design. Fluorescent lights, neon signs, nearby radio stations, or power lines can interfere with
the optimal operation of the system. The magnetic impulse noise from relays that control gate opening and
closing can also disrupt the RF signal.
Interference may degrade both reader and tag performance. Existing interference at the site may be
shielded, removed, or positioned further from the Encompass 4 Reader and/or antenna. In some cases,
changing the operating frequency of the Encompass 4 Reader may provide a simple solution. Readers in
proximity should have at least a 2 MHz frequency separation. Refer to
.
Strong RF sources of any frequency, in proximity to the tag, can preclude the tag
receiving the reader interrogation. Refer to
“Chapter 9 Troubleshooting and Maintenance” on page 9–149
for more information.
Electrical and Communications Requirements
All construction work at the site must be completed before installing the Encompass 4 Reader. Electrical
and communications cables should be installed according to all applicable local and federal building code
requirements. Specific instructions for positioning and installing the Encompass 4 Reader are discussed in
“Figure 29 Correct Orientation of Reader” on page 4-41.
Junction Box
Use a watertight junction box that meets applicable local and national building codes for connecting power
and communications wiring. The junction box houses the terminal strip for power and communications
connections. TransCore recommends a NEMA Type-4 junction box with a back-mounting panel.
Power and Communications Cables
Cable length for power and communications depends on the physical characteristics of the Encompass
4 Reader installation site.
lists accessory kits available for cabling options based on your site’s
requirements.
Table 2 Connector Cabling Accessory Kits
Part Number
Description
58-1620-001
5-ft connector cable harness
58-1620-002
20-ft connector cable harness
58-1620-006
35-ft connector cable harness
58-1620-007
45-ft connector cable harness
76-1620-005
110V AC to 18V AC Class C transformer
76-1620-006
12V AC to 18V AC step-up transformer
Chapter 2 Developing the Site Plan
TransCore Proprietary
2–15
Содержание encompass 4
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