Adcon A720 Guide de l'utilisateur télécharger pdf (Page 102)

CHAPTER 3

Advanced Functions

102

The last step is to convert the analog values to actual engineering

units. This is easily accomplished if we know what sensor is

connected to each input of the RTU, and its conversion equation.

Let’s assume that a temperature sensor is connected to the

Analog7 input. Then:

Note that 2669 is A6D converted to decimal while the -40 was

necessary because the standard Adcon temperature sensor has a

range from -40 to 60 ºC.

Similarly, the battery level can be computed as follows:

Note here that we had to deal with an 8-bit value (59 hex = 89

decimal), so the divider is 255, while the previous example was

based on a 12-bit conversion and the divider was 4095.

Temp

°C[]

2669 100⋅

4095

------------------------- 40– 25,17==

Batt

V[]

89 20⋅

255

---------------- 6,98==

1 2 ... 97 98 99 100 101 102 103 104 105 106 107 ... 145 146

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Adcon A720 Guide de l'utilisateur Page 102