Writing Message; Execution And Message Test - WEG CFW08 Vector inverter User Manual

CFW-08 OPTIONS AND ACCESSORIES

8.19.3.4.2 Writing Message

1) Master:
EOT ADDR
2) Inverter:
ADR NAK
3) Master:
EOT
8.19.3.5 Execution and
Message Test
138
ETX: control character - End of Text;
BCC: CheCksum Byte - EXCLUSIVE OR of all bytes between STX
(excluded) and ETX (included).
NOTE:
In some cases there can be an inverter answer with:
This message sends data to the inverter variables. The inverter will answer
by indicating if the data have been accepted or not.
STX
CODE
or ADR ACK
Format of the writing message:
EOT: control character of the End Of Transmission;
ADR: inverter address;
STX: control character of the Start of TeXt;
TEXT: consists in:
CODE: variable address;
" = ": separation character;
VAL: 4 HEXADECIMAL digit values;
ETX: control character of the End of TeXt;
BCC: CheCksum Byte - EXCLUSIVE OR of all the bytes between
STX (excluded) and ETX (included).
Format of the inverter answer message:
Acceptance:
ADR: inverter address.
ACK: ACKnowledge control character.
Without Acceptance:
ADR: inverter address.
NAK: Not AcKnowledge control character.
This means that the data were not accepted and the addressed
variable continues with its old value.
The inverter and the master test the message syntax.
The answers for the respective verified conditions are defined as follows:
Reading Message:
no answer: with wronG message structure, control characters
received incorrectly or wrong inverter address;
NAK: CODE corresponding to a non existing variable or there is
only a writing variable;
TEXT: with valid messages.
ADR NAK refer to Item 8.18.3.5
=
VAL
TEXT
ETX BCC