28
5.6
Conductivity Settings
Derived parameters from the conductivity sensor can be adapted by the user. This affects specific conductance and total dissolved
solids (TDS) values.
TDS Coefficient
In ODO/CT probes, the coefficient used to calculate TDS can be modified by the user. The value is set by writing an entire block
of values (non-divisible) using a write multiple registers command (function code 0x10). This information can be broadcast to all
devices on the network. The default value is 0.65 and is saved over power cycles. Valid values range from 0.3 to 1.0.
Specific Conductance Temperature Reference
In ODO/CT probes, the standard temperature reference used to calculate specific conductance can be modified by the user. The
value is set by writing an entire block of values (non-divisible) using a write multiple registers command (function code 0x10). This
information can be broadcast to all devices on the network. The default value is 25C and is saved over power cycles. Valid values
range from 15C to 25C.
Request
Function Code
1 byte
0x10
Register Address
2 bytes
0x0500
Number Registers
2 bytes
0x0002
Byte Count
1 byte
0x04
Register Values
4 bytes
TDS Coefficient [3:0]
Request
Function Code
1 byte
0x10
Register Address
2 bytes
0x0502
Number Registers
2 bytes
0x0002
Byte Count
1 byte
0x04
Register Values
4 bytes
Specific Conductance Temperature Reference (C) [3:0]
Address
Description
R/W
Type
Default
0x0500
TDS Coefficient [3:0]
RW
Float
0.65
0x0501
Address
Description
R/W
Type
Default
0x0502
Specific Conductance Temperature Reference (C) [3:0]
RW
Float
25
0x0503
Modbus Configuration & Commands
