16
5.3
Data
Values for available parameters are available by via a read input registers command (function code 0x04). Most of these values are
32-bit IEEE-754 floating point numbers in big endian format. Each value is a combination of two registers. The read must read an
entire value, so the read must start at an even (or zero) register address, and read an even number of registers. Any values that are
not available, such as conductivity measurements in an ODO/T device or reserved space will return a NaN (0xFFFFFFFF)..
Address
Description
R/W
Type
0x0000
ODO Saturation (%) [3:0]
R
Float
0x0001
0x0002
ODO (mg/L) [3:0]
R
Float
0x0003
0x0004
ODO Local Barometer Compensated (%) [3:0]
R
Float
0x0005
0x0006
Temperature (C) [3:0]
R
Float
0x0007
0x0008
Reference Temperature (C) [3:0]
R
Float
0x0009
0x000A
Time Since Boot (ms) [3:0]
R
U32
0x000B
0x000C
*Conductivity (us/cm) [3:0]
R
Float
0x000D
0x000E
*Specific Conductivity (us/cm) [3:0]
R
Float
0x000F
0x0010
*Salinity (ppt) [3:0]
R
Float
0x0011
0x0012
*Conductivity nLF (us/cm) [3:0]
R
Float
0x0013
0x0014
*Total Dissolved Solids (mg/L) [3:0]
R
Float
0x0015
0x0016
Reserved [3:0]
R
Float
0x0017
0x0018
Reserved [3:0]
R
Float
0x0019
0x001A
Reserved [3:0]
R
Float
0x001B
0x001C
Reserved [3:0]
R
Float
0x001D
0x001E
Reserved [3:0]
R
Float
0x001F
*Only available in ODO/CT devices
Modbus Configuration & Commands
