CS Instruments FA 550 User Manual

Modbus
Page 17 FA 550 V1.00
11 Modbus Register
The dew point sensor FA 550 comes with a Modbus RTU Interface.
Before commissioning of the sensor the communication parameters
Modbus ID, Baud rate, Parity und Stop bit
must be set in order to ensure the communication with the Modbus master.
The adjustment can be done either with the CS Instruments PC service software, DS 400, DS
500 and the hand-held instrument PI 500 done.
Modbus communication default values:
 Modbus ID : 1 (1 -247)
 Baudrate: 19200 bps (1200,2400, 4800, 9600, 19200, 38400 bps)
 Parity: even (none, even, odd)
 Stoppbit: 1 (1,2)
Supported are following function codes:
 Function code 03: Read Holding Register
 Function code 16: Write multiple Register
For parameter settings/- changing see chapter 12 Operation/Modbus Settings
11.1 Register Mapping measuring values
Modbus
Register
Modbus
Address
No.of
Byte
Data
Type
Description
Default
Setting
Read
Write
Unit /Comment
1001
1000
4
Float
Temperature
R
[°C]
1003
1002
4
Float
Temperature
R
[°F]
1005
1004
4
Float
Relative Humidity
R
[%]
1007
1006
4
Float
Dew Point
R
[°Ctd]
1009
1008
4
Float
Dew Point
R
[°Ftd]
1011
1010
4
Float
Absolute Humidity
R
[g/m³]
1013
1012
4
Float
Absolute Humidity
R
[mg/m³]
1015
1014
4
Float
Humidity Grade
R
[g/kg]
1017
1016
4
Float
Vapor Ratio (Volume)
R
[ppm]
1019
1018
4
Float
Saturation vapor pressure
R
[hPa]
1021
1020
4
Float
Partial Vapor Pressure
R
[hPa]
1023
1022
4
Float
Atmospheric DewPoint
R
[°Ctd]
1025
1024
4
Float
Atmospheric DewPoint
R
[°Ftd]
Remark for DS400 / DS 500 / Handheld devices - Modbus Sensor Datatype:
„Data Type R4-32“ match with „Data Type Float“

CS Instruments FA 550 Specifications

General

Brand	CS Instruments
Model	FA 550
Category	Accessories
Language	English