CD Automation srl CD3000E-3PH from 25A to 500A User’s Manual
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13.5 Error and exception responses
If a message contains an altered character, if fails the CRC, or if the received message contains a syntax
error (for example the number of the byte or of the words is not correct), then the unit will ignore the
message.
If the received message is correct but contains a not valid value, the unit will send an answer of
exception (5 byte):
Address Unit Function Error Code CRC 16
LO HI
The byte with the function number, represent the function number of the message that has caused the
error with the first Bit set to 1 (ex. the function 3 becomes 0x83) The error code could be one of the
followings:
Error Code Name Cause
1 ILLEGAL FUNCTION Function not supported.
2 ILLEGAL DATA ADDRESS Address out of range.
3 ILLEGAL DATA VALUE Attempt to write invalid or action not carried out.
NOTE: If you write a parameter's value equal at his actual value this is a valid transaction
and don't cause an error.
13.6 Address Configuration
The thyristor unit is assigned a unique device address by the user in the range 1 (default) to
127 using the parameter P115 in the Hardware menu. This address is used to recognise the
messages queries to her assigned.
The thyristor unit does not respond at the messages queries that don't have the same assigned address.
The thyristor unit will also accept global messages (Broadcast) sends at the address 0. No responses are
returned for globally addressed queries.
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