Instruction manual

2.e. Count Storage and Specific Functions

In Count Storage Mode, the only information stored is the number of vehicles that have been detected in each lane. Up

to 16 lanes are supported (depending on the number and type of sensors input boards installed) in this mode. Normally,

each lane will use one sensor to collect the count. When a Road Tube or Piezo Sensor is used as the lane sensor, the

count may be divided by two. Since loop sensors hold presence for the duration of a vehicle, the “Divide-By-Two” option

is not used by loops.

Storage of the counts is performed in the same manner as outlined above for Binned data (i.e. using “Record Intervals”).

There are two specialized sensor configurations for count data when two axle sensors are used (normally road tubes);

they are Lane Subtraction and Directional.

Lane Subtraction

This mode is used when you want to get individual lane count from two different lanes of

traffic from one side of the road. The road tube attached to lane 1 (or any other ODD

numbered lane) is laid out across both lanes. The road tube attached to Lane 2 (or the

next even numbered lane) is laid out across one lane. The Phoenix II will subtract the

even lanes from the odd lane’s count to obtain the proper directional count for the odd

numbered lane.

Traffic Direction does not matter

Odd Number Lane Must Be Longer Tube (i.e. Lanes

1,3,5,7,9,11,13, or 15)

Directional

This mode is used for counting two-way traffic on a narrow road. A road tube pair (such

as 1-2 or 3-4) is laid out across both lanes with road tube one foot apart. The Phoenix will

determine (from the order of actuation) the proper directional count for each lane.

You can monitor any or all lanes during collection or testing, with the system showing you the current lane totals for the

record interval.

2.f. Sensor Storage and Specific Functions

Sensor Data Storage or (Timestamp) is a flexible mode of storing traffic data. Data is stored sequentially when a

sensor is activated, allowing custom software to organize the data in a way that is tailor made for the user.

Sensor Data Storage (Timestamp) stores the simplest form of data. Inside the Phoenix II is a timer that counts down

(starting from 16,777,216) at the rate of 10.695 KHz (10,695 cycles per second). When its 24-bit timer counts down to

zero, it recycles to 16,777,215. At the rate of 10.695 KHz, the time it takes to revolve through the counter is

16777215/10695 or about 26 minutes. When a sensor is activated, the counter stores the lane, type of sensor, and the

timer reading. When the sensor is activated again, it stores the lane, time, type of sensor, and the new timer reading.

The counter will store an “A On” for an axle strike, a “P On” for a presence sensor turning on, or a “P Off” for a presence

sensor turning off.