Table 79 Error codes in register 0203
hex
Bitmask
Error message
Severity
0000
hex
Status OK
0001
hex
Temperature measurement error
Error
0002
hex
Humidity measurement error
Error
0004
hex
Humidity sensor failure
Error
0008
hex
Capacitance reference error
Error
0010
hex
Ambient temperature out of range
Error
800000
hex
Sensor heater failure
Warning
A.4.4 Test value registers
Read the known test values from the test registers to verify the functionality of your Modbus
implementation.
Table 80 Modbus test registers (read-only)
Register
number
Address
Register description
Data format
Test value
7937
1F00
hex
Signed integer test
16-bit integer
-12345
7938
1F01
hex
Floating point test
32-bit float
-123.45
1F02
hex
7940
1F03
hex
Text string test
text
Text string "-123.45"
1F04
hex
1F05
hex
1F06
hex
A.5 Device identification objects
Table 81 Device identification objects
Object ID
Object ID
(hexadecimal)
Object name
Example contents
0
00
hex
VendorName
"Vaisala"
1
01
hex
ProductCode
"HMP4"
HMP Series with MMP8 and TMP1 User Guide
M212022EN-F
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