User`s guide

179
CHAPTER 8 - CFW-08 OPTIONS AND ACCESSORIES
Writing message
This message sends data to the inverter variables. The inver-
terwill answer byindicating if the data have been accepted or
not.
Format of the writing message:
EOT:
control character of End Of Transmission;
ADR:
inverter address;
STX:
control character - Start of TeXt;
TEXT:
consists in:
CODE:
variable address;
“ = “:
separation character;
VAL:
4 HEXADECIMAL digit values;
ETX:
control character - 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:
NotAcKnowledge control character.
This means that the data were not accepted and the
addressed variable continues with its old value.
ADR
NAK
Refer to the item 8.24.3.5.
1) Master:
EOT ADR STX
= xH xH xH xH
ETX
BCC
CODE
VAL
(HEXADECIMAL)
TEXT
2)Inverter:
ADR NAK
ADRACK
or
3) Master:
EOT