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Modbus Registers
The Modbus registers available for HMD65 include measurement output registers in metric and
non-metric units, pressure compensation setpoint configuration, status registers, and
communication test registers. For status registers, see HMD65 User Guide.
The Modbus communication settings are configured using the DIP switches on HMD65
component board: see
CAUTION!
addresses in actual Modbus messages (Modbus Protocol Data Unit (PDU)) start
from zero.
Please check the reference documentation of your Modbus host (PLC) for the
notation of Modbus register addresses.
16-bit integers have a maximum value of +32767. Certain measurement
parameters can exceed this value when x100 scaling is used (see measurement
registers 0100
recommended to use 32-bit float values.
Measurement Data Registers
Table 3 Modbus Measurement Data Registers (Read-Only)
Register Address
Number (Hexadecimal)
(Decimal)
Floating Point Values (Metric)
1 0000
0001
3 0002
0003
5 0004
0005
7 0006
0007
9 0008
0009
11 000A
000B
18
Modbus and BACnet Communication (RS-485) (page
Registers are numbered in decimal, starting from one. Register
... 0107 and 0180
hex hex
Register Description
Relative humidity
hex
hex
Temperature
hex
hex
Dew point temperature
hex
hex
Dew/frost point
hex
temperature
hex
Absolute humidity
hex
hex
Mixing ratio
hex
hex
... 0187 ). Whenever possible, it is
hex hex
Data Format
32-bit float
32-bit float
32-bit float
32-bit float
32-bit float
32-bit float
16).
Unit
%RH
°C
°C
°C
3
g/m
g/kg
M212264EN-B