The 820A Series traffic controllers from U.S. Traffic are among the most trusted and effective traffic controllers in the industry. To enhance flexibility, the 820A controllers support various firmware configurations which fulfill the demand for expanded features and options. The 820A OSAM controllers feature an alphanumeric user-friendly display for easy data entry, as well as a Graphic Intersection Display of NEMA-required items viewable during editing of the 820A's database. Programming has never been easier with the menu-driven selections in traffic engineering terms.

Features of the 820A OSAM include hardware interconnect capability, both as a secondary and as a time-of-day/day-of-week master. Time-based coordination features two-hundred events, sixteen day plans, ten week plans, thirty exception days, sixteen holidays, and a true yearly schedule. Forty-eight independent coordination plans and sixteen traffic responsive free plans guarantee flexible control with variable phasing. A free or coordinated plan may use any of eight detector plans. Dynamic extension of maximum green time is based on vehicle
demand.

Max II is selective by time-of-day for each phase. The status of all inputs may be displayed for cabinet wiring verification. On-line diagnostics continuously check for errors and store the last
64 errors with the date and time.

The 820A OSAM also provides remote operations through an RS-232 port that may be connected to a Hayes compatible modem. An 820A OSAM controller interfaces with the U.S. Traffic Multisonics OSAM 32 On-Street Arterial Master.

Central Networking

When the 820A is networked, using the IQ Central environment, the maximum number of masters and local controllers that can be connected to the system is 32,768 (assuming your network bandwidth is configured to handle this volume of traffic.) IQ Central can be used to retrieve, view, modify and transmit the controller database to the 820A OSAM, and it can also be used to print out reports on the programming. IQ Central can be used to monitor the status of the controller, either directly or via an OSAM32 master, and it can also be used to retrieve status logs from the controllers.

In order to enable the 820A to communicate with the standard NTCIP spoken by IQ Central, the controller or master will need to
connect to an IQ Connect network translator unit, available
from Peek Traffic.