Agrowtek GrowControl SXC Manuale di istruzioni - Pagina 6

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Supported Commands

0x03 Read Multiple Registers

0x06 Write Single Register

0x10 Write Multiple Register

Register Types

All 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 floating 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.

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.

Offset Calibration

Offset, 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 offset calibration, simply write the corrected sensor value to the offset 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. "

Analog Calibration

Analog output calibration sends a positive or negative offset to the respective output channel's digital to

analog converter (DAC.) The DAC has a resolution of 0.005mA/bit.

±1 calibration bit = ±0.005mA adjustment

For example: to shift the analog output up by 0.1mA, set the analog offest value to +20. ( 0.1 / 0.005 = 20)

Integer Scale

Range

x100

-2000 - 6000 (-20 - 60°C)

x10

0 - 1000 (0 - 100%)

0 - 1000 W/m2

0 - 2000 ppm