Wavetronix SmartSensor Advance Extended Range (SS-200E) - Use Manual do Utilizador descarregar pdf (Página 78)

CHAPTER 7  CHANNELS-ALERTS-ZONES 77

Figure 7.7 – Providing Dilemma Zone Protection

By providing zones for level-one priority dilemma zone protection, level-two dilemma zone

protection and queue clearance, a priority channel provides exceptional detection from

start-of-green to end-of-green.

Note

There may be a number of uses of the discovery range feature for other applications

than truck priority. For example, you could require that a vehicle be discovered at a

certain range (using the discovery range threshold) and that it travels to a down-

stream zone several hundred feet away before it activates a channel output. This is

a way to know that we have tracked a speciﬁc vehicle over an extended range. This is

better than simple using the channel delay because it isolates a single vehicle.

Pulse Channel

A pulse channel consists of one dedicated zone. When a tracked detection enters the zone,

the channel will pulse on once and then return to the o state. e on time and the mini-

mum o time of the pulse are predetermined. If two detections enter the zone at exactly the

same time, then the associated pulses will be sent sequentially with the minimum o time

separating them.

Note

The duration of the on time and o time in each pulse is controlled by the output

frequency setting in SSMA. By default the output frequency setting is 130 ms. Since

standard trac controllers sample at 10Hz, a 130 ms on time and o time should be

of sucient length to faithfully transfer all pulses generated by the sensor.

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Wavetronix SmartSensor Advance Extended Range (SS-200E) - Use Manual do Utilizador Página 78