Vaisala Optimus OPT100 - Modbus Exception Responses

Register number Address Data format Test value
209 00D0
hex
32-bit integer -1234567890
00D1
hex
211 00D2
hex
64-bit integer -1234567890123456789
00D3
hex
00D4
hex
00D5
hex
215 00D6
hex
32-bit float 1.23456
00D7
hex
217 00D8
hex
64-bit float 1.23456789
00D9
hex
00DA
hex
00DB
hex
A.5 Exception responses
Table 32 Modbus exception responses
Code Name Reason
01 ILLEGAL FUNCTION Unsupported function code
02 ILLEGAL DATA ADDRESS Register address or Object ID out of valid ranges
03 ILLEGAL DATA VALUE Otherwise invalid request
Accessing unavailable (temporarily missing) measurement data does not generate a Modbus
exception. “Unavailable” value (a quiet NaN for floating point data or 8000
hex
for integer data)
is returned instead. An exception is generated only for any access outside the applicable
register ranges.
Appendix A – Modbus reference
117