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Traffic Information Systems
Application: PC-Based Traffic Information System
Quatech Products Used: QSU-100
4-Port RS-232 USB Serial Adapter
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Intelligent Transportation Systems serve many purposes from providing
motorists with traffic information via variable message signs, to monitoring
traffic flow using remote controlled cameras, to managing that traffic
flow using lane control signals. A wide variety of serial devices are
used in these systems in addition to those just mentioned, such as pavement
sensors that detect traffic volume at lights, loop detector networks used
to track traffic movement and radar and sonar vehicle detectors--to name
just a few. PC-based systems located in roadside NEMA enclosure cabinets
control the multiple devices used in these systems. However, as standard
serial ports are rapidly disappearing from PCs, sophisticated Traffic
Information Systems often require more serial ports than are available
in a standard computer. As shown in the diagram above, Quatech USB serial
adapters (available with 1-16 ports) can provide multiple serial ports
via a single USB port--more than enough for even the most device-intensive
traffic information system.
Quatech USB Serial adpaters offer a number of unique features that make
them particularly well-suited for port-expansion in traffic information
systems. First, all our adapters are port-powered, an unusual feature
in large-port count adapters, and one that can be extremely useful in
roadside enclosures where power outles are limited. Quatech USB serial
adpaters come as external boxes for use with a standard PC, or as embedded
cards that are easily incorporated into custom enclosures. In addition,
the optional surge suppression package provides the protection required
for often harsh roadside environments. Fruther, with data rates up to
421.6 kbps, Quatech USB serial adapters provide the performance required
to ensure that polling-intensive applications run smoothly. Finally, Quatech
USB serial adapters enumerate themselves as standard COM ports, and are
invisible to software, thus no alterations are required to any application
software.
Other Intelligent Transportation Systems Applications:
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