Agrowtek SXC Manuel d'installation - Page 6

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Supported Commands

0x03 Read Multiple Registers

0x06 Write Single Register

A request to use a function that is not available will return an illegal function exception.

Register Types

Data registers are 16 bits wide with addresses using the standard MODICON protocol. Floating point values

use the standard IEEE 32-bit format occupying two contiguous 16 bit registers. ASCII values are stored with

two characters (bytes) per register in hexadecimal format.

Sensor Value Registers

Sensor values are available in integer or oating point formats depending on the register requested (see

map.)

Sensor #

Type

Temperature

Humidity

Light

CO2

For example: an integer temperature value of 2417 is equal to a temperature reading of 24.17°C.

The value "9999" is representative of a failed sensor (with the exception of CO2 which will read 0.)

Toggle Units Register

Sensors with alternate units may toggle the units using the "toggle units" register. To toggle the units, send

the sensor channel number to to the toggle register. This register is write-only.

For example: to toggle between °F and °C, send a "1" to register 1002.

Calibration Registers

Calibration registers are 16-bit signed integers for the purpose of calibrating the sensor values or analog out-

put channels. Calibration may be achieved by writing the desired calibrated value to the associated register.

Writing to the calibration registers automatically invokes the calibration routine for that register.

O set Calibration

O set, or zero calibration, is an arithmatic positive or negative correction to the sensor reading and is the

only type of sensor calibration available on climate/environmental sensors.

To perform a sensor o set calibration, simply write the corrected sensor value to the o set calibration reg-

siter (taking into account the integer scale as shown above.)

For example: to set the temperature to a calibrated value of 25°C, write the value "2500. "

Integer Scale

x100

x10

Range

-2000 - 6000 (-20 - 60°C) / -400 - 14000 (-4 - 140°F)

0 - 1000 (0 - 100%)

0 - 1000 W/m2

0 - 10,000 ppm