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Moxa Wide Temperature Device Servers in Traffic Signal Control and Coordination Systems
Product Solutions:
NPort 5110A/NPort 5130A/NPort 5150A Series

1-port RS-232/422/485 serial device servers

NPort 5210A/NPort 5230A/NPort 5250A Series

2-port RS-232/422/485 serial device servers

NPort IA5150A/NPort IA5250A/NPort IA5450A Series

1, 2, and 4-port serial device servers for industrial automation


Intelligent traffic systems make traffic smoother and safer by managing Signal Light Control and Coordination systems from Traffic Management Centers (TMC). Reliable and consistent remote device connectivity with these traffic signals and devices is the key to smooth system operations.

Traffic systems use a variety of different control systems and devices, and all of the equipment—such as signal light controllers, priority sensors, loop detectors, video detection systems, and radar detection systems—are installed in roadside cabinets.

Traditionally, the traffic signal lights are controlled by an embedded controller inside a roadside cabinet mounted on a concrete pad, and connected to a detector interface panel, which includes all types of serial-based detectors, amplifiers, a conflict monitor unit, flash transfer relays, and a police access panel that allows the police to disable the signal and other components locally.

Modern intelligent traffic systems move from local control to networked, centralized control: the most recent and advanced traffic light systems are designed to be controlled by monitors or computers, and include additional tools and sensors for traffic controllers, so they can be commanded in real-time to deal with changing traffic patterns. However, these advanced intelligent traffic systems only emerge from widely distributed and intelligently networked devices; to join the intelligent traffic system existing serial traffic devices must be able to connect to Ethernet networks.


System Requirements
The major objectives of intelligent traffic systems are:
-          Increasing the traffic handling capacity of their roads.
-          Reducing accidents and encouraging adherence to the speed limit.
-          Reducing unnecessary stopping and starting of traffic
-          Reducing driver frustration and “road rage”.
And, the most pressing concerns are:
-          The reliability and time of service of the traffic light controller
-          The environmental challenges posed by outdoor, roadside cabinet operating environments
-          The operating challenge posed by weather and temperature changes
-          Preventing traffic light “downtime” or delay.
-          Achieving sufficient performance for real-time traffic monitoring
-          Minimizing time spent on system and device maintenance and repair

Moxa Solution

Device Servers: 

For device networking, Moxa provides high industrial-grade and wide temperature device servers, which support 1 to 16 serial ports to connect field devices through the network or internet to the TMC so public agencies can monitor and access their traffic field devices.

-          Real COM Driver – Allows ITS without changing existing software
-          No distance limitations on the scale and reach of the traffic system, thanks to Internet communications backbone
-          Highly reliable, wide-temperature design for operations outdoors and in extreme temperature environments

Ethernet Switches: 

For networking, Moxa provides industrial-grade unmanaged or managed Ethernet switches for 24/7 non-stop remote networking with the TMC network.

-          Low total cost of ownership
-          High expandability 



Why Moxa

•  Prevent downtimes from ambient temperature changes.
•  Remotely manage traffic signal sensors directly through Ethernet or fiber networks with Moxa device servers.
•  Improve efficiency with real-time traffic monitoring.