Exception responses, Table 48, Hmt330 modbus exception responses – Vaisala HMT330 User Manual
Page 208
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Exception Responses
Exception responses from the transmitter are according to the Modbus
Application Protocol Specification V1.1b.
Table 48
HMT330 Modbus Exception Responses
Code
Name
Reason
01
ILLEGAL FUNCTION
Unsupported function code
02
ILLEGAL DATA ADDRESS
Address out of valid ranges
03
ILLEGAL DATA VALUE
Otherwise invalid request
Accessing unavailable (unsupported or temporarily missing) registers
inside ranges specified in Table 41 does not generate an exception.
“Unavailable” value (a quiet NaN for floating point data or zero for
integer data) is returned instead. An exception is generated only for any
access outside the register blocks defined in section Register Map on
page 200.