Agrowtek SXG Gebrauchsanweisung - Seite 5
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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.
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.
MODBUS Holding Registers
Parameter
Address
Serial#
DOM
HW Version
FW Version
Toggle Units
Heater Power
Sensor Value
Calibration Input,
Offset (Zero)
A request to read or write a register that is not available will return an illegal address error (0x02).
5
Description
Range
Device Slave Address
1 - 247
Device Serial Number
ASCII
Date of Manufacture
ASCII
Hardware Version
ASCII
Firmware Version
ASCII
Toggle sensor units
1 - 4
RH Sensor Heater
0 - 16 *
CO2
400 - 10,000ppm
CO2
400 - 10,000ppm
CO2
See integer ranges above.
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Type
Access
8 bit
R/W
8 char
R
8 char
R
8 char
R
8 char
R
16 bit, unsigned
W
16 bit, unsigned
W
16 bit, signed
R
32 bit float
R
16 bit, signed
W
Address
40001
40004
40008
40012
40016
41002
41003
40101
40201
41101