User's Guide _______________________________________________________________________
78 ___________________________________________________________________ M211060EN-H
Device Identification Objects
Table 19
Device Identification Objects
Object Id
(decimal)
Object Id
(hexadecimal)
Object Name (as defined
by the specification)
Example
0
00
VendorName
Vaisala
1
01
ProductCode
HMP110
2
02
MajorMinorVersion
2.1.0
3
03
VendorUrl
4
04
ProductName
Vaisala HUMICAP® Humidity and
Temperature Probe HMP110
128
80
SerialNumber*
D0710040
129
81
CalibrationDate*
2015-11-21
130
82
CalibrationText*
Vaisala/HEL
*
Vaisala-specific device information object
NOTE
Both stream access and individual access to the device identification
objects are supported.
Communication Test Registers
Communication test registers can be used to find the correct Modbus master configuration for
the data types and the byte order of the Vaisala device.
Test registers are also useful for testing if the register addresses should be specified as 1-based
logical or 0-based PDU addresses on the master.
Table 20
Communication Test Registers
Logical
Address
(decimal)
PDU Address
(hexadecimal)
Register Description
Data Format Register
Type
Notes
7937
1F 00
Test value (signed integer) 16-bit
integer
read-only Constant value
-123.45×100
(CFC7
h
)
7938
1F 01
Test value
(floating point)
LSW
MSW
32-bit bit
float
read-only Constant value
-123.45 (C2F6
E666
h
)
7939
1F 02
7940
1F 03
Test value (text string)
8-byte string read-only
Constant text
"-123.45"
(2D31 3233 2E34
3500
h
)
7941
1F 04
7942
1F 05
7943
1F 06
