TransCore 05531 User Manual
Encompass 4/4800 Multiprotocol Reader System Guide
2-4
Caution
Attempting to read an Intellitag-based tag in the presence of an ATA or ISO read-only
tag may provide unreliable results.
tag may provide unreliable results.
The factors that influence the readability include, but are not limited to physical orien-
tation and configuration, type of read-only tag, ratio of backscatter cross-section of the
tags, and whether the tag is battery- or beam-powered.
tation and configuration, type of read-only tag, ratio of backscatter cross-section of the
tags, and whether the tag is battery- or beam-powered.
Reader and Tag Alignment
The position of the Encompass 4/4800 Multiprotocol Reader and placement of the tag
on the vehicle must be compatible. Also, consider any existing tagged vehicles now
using the facility to determine the optimal Encompass 4/4800 Multiprotocol Reader
location and orientation at the site.
on the vehicle must be compatible. Also, consider any existing tagged vehicles now
using the facility to determine the optimal Encompass 4/4800 Multiprotocol Reader
location and orientation at the site.
Note: If any of the vehicles using your facility already have tags, such as those used
in toll applications, contact TransCore at 1-800-755-0378 for information about
mixed-tag installations before you plan tag type, location, and programming.
in toll applications, contact TransCore at 1-800-755-0378 for information about
mixed-tag installations before you plan tag type, location, and programming.
Three primary criteria must be satisfied to achieve the highest read reliability:
•
Polarization of the tag and the Encompass 4/4800 Multiprotocol Reader must be
aligned in the same direction
aligned in the same direction
—
both horizontal.
•
The installed tag must be in a direct, unobstructed line of sight to the Encompass
4/4800 Multiprotocol Reader .
4/4800 Multiprotocol Reader .
•
Tags designed to be mounted in a vehicle windshield must be mounted in the vehi-
cle’s windshield, and tags designed to be mounted on the exterior surface of the
vehicle must be mounted on the exterior surface of the vehicle.
cle’s windshield, and tags designed to be mounted on the exterior surface of the
vehicle must be mounted on the exterior surface of the vehicle.
Caution
A tag may not be reliably read unless the preceding criteria are met.