Modbus
Serial Interface Settings
Table 1 Default Serial Interface Settings
Property
Description/Value
Bit rate
19200
Parity
None
Data bits
8
Stop bit
2
Flow control
None
You can use up to ten probes on the same RS-485 line. You must configure each probe on the
line to have a different Modbus address.
Measurement Data Registers
Table 2 Modbus Measurement Data Registers (Read-Only)
Register
Number
(Decimal)
Address
(Hexadecimal)
Register Description
Data Format
Metric Unit
Floating Point Values
1
0000
hex
Relative humidity
32-bit float
%RH
3
0002
hex
Temperature
32-bit float
°C
7
0006
hex
Dew point temperature
32-bit float
°C
9
0008
hex
Dew/frost point
temperature
32-bit float
°C
11
000A
hex
Dew/frost point
temperature at 1 atm
32-bit float
°C
13
000C
hex
Dew point temperature
at 1 atm
32-bit float
°C
14
000E
hex
Absolute humidity
32-bit float
g/m
3
16
0010
hex
Mixing ratio
32-bit float
g/kg
19
0012
hex
Wet-bulb temperature
32-bit float
°C
21
0014
hex
Water vapor
concentration
32-bit float
ppm
v
23
0016
hex
Water vapor pressure
32-bit float
hPa
13
ENGLISH
Summary of Contents for HUMICAP HMP4
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