Vaisala DRYCAP DMT143 - Modbus Registers

A.4.1 Measurement Data Registers
Table 26 Modbus Measurement Data Registers (Read-Only)
Register
Number
(Decimal)
Address
(Hexadecimal)
Register Description Data
Format
Unit
1 0000
hex
Relative humidity (RH) 32-bit float %RH
7 0006
hex
Dew/frost point temperature
(T
d/f
)
32-bit float °C
11 000A
hex
Dew/frost point temperature at
1 atm (T
d/fa
)
32-bit float °C
21 0014
hex
Water concentration (ppm) 32-bit float ppm
257 0100
hex
Relative humidity (RH*100) 16-bit
signed
integer
%RH
260 0103
hex
Dew/frost point temperature
(T
d/f
*100)
16-bit
signed
integer
°C
262 0105
hex
Dew/frost point temperature at
1 atm (T
d/fa
*100)
16-bit
signed
integer
°C
267 010A
hex
Water concentration (ppm) 16-bit
signed
integer
ppm
Accessing unavailable (temporarily missing) measurement data does not generate an
exception. “Unavailable” value (a quiet NaN for floating point data or 8000
hex
for integer data)
is returned instead.
A.4.2 Status Registers
Table 27 Modbus Status Registers (Read-Only)
Register
Number
(Decimal)
Address
(Hexadecimal)
Register Description Data
Format
Notes
513 0200
hex
Error status 16-bit
integer
1 = No errors
514 0201
hex
Online status 16-bit
integer
1 = Data available
0 = Outputs frozen due
to autocal or purge
Appendix A – Modbus Reference
77