Instruction manual

Appendix B.3 Count Data Collection

Count data stores the total number of vehicles or the total number of axles that have crossed the sensors for a given

time period. The two factors to consider are: how many lanes are enabled, and what the record interval length is?

Follow the steps outlined below to calculate how long a Phoenix II will collect count data into memory:

Multiply the total number of enabled lanes by 2.

Add one to the number. This is the Total number of bytes per record interval.

The next step is to take the total number of bytes in your Phoenix II, subtracting 2000 (for overhead), and

divide it by the total number of bytes per record interval. This gives you the number of record intervals the

memory will hold. Total number of bytes in your Phoenix II can be determined by using the Show Status

option, Section 4.4.

Next, multiply the total number of record intervals the memory will hold by the record interval length (in

minutes). This gives you the total length of time, in minutes, the Phoenix II will record into memory.

You are basically done. You can calculate the number of hours by dividing the time in minutes by 60, or the

number of days by dividing the time in minutes by 1440.

The above system works only if you do not have different record interval lengths during the day.

If Interval Length is in minutes divide Total Record Time by 1440 this will give you the number of days the Phoenix II

can record, if necessary, divide this number by 365 to receive the total number of years.

Appendix B.4 Sensor Data Collection

Sensor data storage will store in memory each individual sensor activation. Therefore, the more sensor activations you

have, the quicker memory will run out.

Follow the steps below to calculate how many sensor activations can be stored in the memory of the Phoenix II.

Find out the total amount of memory in the Phoenix II. This can be determined using the Show Status option.

Subtract from the total amount of memory 2000 bytes (for overhead).

Divide by 8. This will be the amount of sensor activations which can be stored in memory.