User guide

CHAPTER 2

System Setup

choose an appropriate sensor subclass by selecting

the appropriate icon.

Note: If you cannot find a suitable EUID for your sensor, contact

Adcon Telemetry.

• Display scale, min and max: type the default values

that will be displayed on a trend graph. In most

cases these values will be the same as for the

Conversion range (see below).

b. Specific entries for analog sensors are:

• Converter: select Linear or Tabular. A linear driver

needs only two values, a minimum and a maximum,

because all values in between are linearly computed

by the driver. If you have a nonlinear sensor, you

must either select one of the built-in tables or

provide your own table with 256 entries (equivalent

to an 8-bit accuracy)—in this later case you should

select other.... The table must be in the form of a

text file (similar to the original addVANTAGE 3 files),

which will be downloaded to the gateway via the

Configurator.

• Sensor type: for linear analog sensors, this defines if

the sensors deliver a voltage (0-2.5V) or a current (4-

20mA using the A502 current-to-voltage converter).

Note: The "4-20mA" setting assumes that you use the A502, which

converts a current of 4-20mA to a voltage of 0.4-2.0V. If you

want to use a different converter, you have to select "0-

2.5V" as sensor type and manually calculate the proper

“Conversion range" settings to reflect the physical values

the sensor would have for a converted voltage of 0 and 2.5V.

• Conversion range, min and max: the minimum and

maximum values delivered by your sensors. The

driver computes all the intermediate values from

these parameters (it automatically selects the

appropriate conversion equation for both 8-bit and

12-bit sensor values).

• Verifier: the driver can be instructed to check the

input values against some preset thresholds. If the

input values are outside the preset thresholds, an

invalid sensor value will be signaled.