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MODBUS Register Map
Parameter
Function
Type
Scale
Access
Address
Device Address
Slave Address
Value, 1-247
8 bit
R/W
40001
Baud Rate
Comm baud rate
Value
16 bit
R
40002
Data Format
Comm data format
Value
16 bit
R
40003
Serial#
Serial Number
ASCII
8 Char
R
40004
DOM
Date of Manufacture
ASCII
8 Char
R
40008
HW Version
Hardware Version
ASCII
8 Char
R
40012
FW Version
Firmware Version
ASCII
8 Char
R
40016
Sensor 1 Value
Sensor output
Signed Int
16 bit
R
40101
Sensor 2 Value
Sensor output
Signed Int
16 bit
R
40102
Sensor 3 Value
Sensor output
Signed Int
16 bit
R
40103
Sensor 4 Value
Sensor output
Signed Int
16 bit
R
40104
Sensor 1 Value
Sensor output
Float
32-bit
R
40201
Sensor 2 Value
Sensor output
Float
32-bit
R
40203
Sensor 3 Value
Sensor output
Float
32-bit
R
40205
Sensor 4 Value
Sensor output
Float
32-bit
R
40207
Sensor 1 Offset Cal
Calibration Input
Signed Int
16 bit
W
41101
Sensor 2 Offset Cal
Calibration Input
Signed Int
16 bit
W
41102
Sensor 3 Offset Cal
Calibration Input
Signed Int
16 bit
W
41103
Sensor 4 Offset Cal
Calibration Input
Signed Int
16 bit
W
41104
Sensor 1 Span Cal
Calibration Input
Signed Int
16 bit
W
41201
Sensor 2 Span Cal
Calibration Input
Signed Int
16 bit
W
41202
Sensor 3 Span Cal
Calibration Input
Signed Int
16 bit
W
41203
Sensor 4 Span Cal
Calibration Input
Signed Int
16 bit
W
41204
Sensor 1 Analog Cal
Calibration Input
Signed Int
16 bit
W
41301
Sensor 2 Analog Cal
Calibration Input
Signed Int
16 bit
W
41302
Sensor 3 Analog Cal
Calibration Input
Signed Int
16 bit
W
41303
Sensor 4 Analog Cal
Calibration Input
Signed Int
16 bit
W
41304
-pH 4.01 or 10.0 calibration
-Conductivity, ORP or DO calibration to solution standard
To set the pH 4.01 calibration, write the value “401.”
To set the conductivity to a calibrated value of 1413uS, write the value “1413.”
Note: perform any “offset” calibrations prior span calibrations.
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)
