Remote Traffic Monitoring System
Application: Network-Enabled Remote Traffic Monitoring
System
Quatech Products Used: SSE-400D
and DSE-400D 1 and 2-Port
RS-232/422/485 Device Servers
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Traffic control rooms are the heart of Intelligent Transportation Systems.
These sophisticated monitoring centers are used to identify problems and
to track and manage traffic patterns. They are typically implemented with
a network of cameras placed throughout a jurisdiction that constantly
record and display road activity. These cameras can be automatically repositioned
via software algorithms, or can be manually controlled via joystick. In
either case, network enabling the Pan-Tilt-Zoom camera controls can streamline
the system and enable multiple systems to access the camera controls just
as if they were physically attached to a computer's standard COM port.
The diagram above depicts one such system. In the control room a joystick
is attached to the Quatech's SSE-400D device server serial port in RS-422
mode. That device server, and MPEG4 decoder and a PC are attached to a
router via Ethernet. The PC is also attached to an ISDN model on its serial
port. The PC connects to the remote ISDN modem in the field to interface
with the cameras. In the field, the ISDN modem connects to the RS-232
port on a serial router. That router also has two Ethernet ports, one
of which is attached to a MPEG4 encoder and the other is attached to a
Quatech device server. (In this case, using two cameras, it is a DSE-400D.
However, Quatech device servers are available with up to 8 ports.) The
serial ports on the Quatech device server are attached to PTZ controls
on the cameras via an RS-422 interface. The control room joystick, or
a preprogrammed camera control application run on the control room server,
repositions the cameras. The video is encoded, decoded and delivered to
the application server via Ethernet.
Other Intelligent Transportation Systems Applications:
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