
Chapter 8 - Appendices
8 - 12
584S Frequency Inverter
Control Characters
Control Characters
Control Characters
Control Characters
(EOT)
Indicates the end of transmission. It therefore clears the line and is sent by the Master
at the start of a new message.
(STX)
This is the start of text character.
(ENQ)
This is the enquiry character. It is sent by the Master as the last character of any type
of polling message.
(ETX)
This is the end of text character. It is followed by another character containing the
checksum.
(ETB)
This is the end of block character. It is sent by the 584S instead of the (ETX) when it
wishes to reply to a multi parameter enquiry. The (ETB) indicates the end of a block,
but not the end of a message. Each block contains information on up to eight
parameters. The (ETB) is used to reply to enquiry polling and multi-parameter polling
(these are explained in "
TYPES OF MESSAGES
").
(ACK)
This is the positive acknowledgement character.
(NAK)
This is the negative acknowledgement character.
Data Characters
Data Characters
Data Characters
Data Characters
(INO)
This is the instrument number. It contains the address of the slave drive and is equivalent to the combination
of the GID, UID characters of the ASCII mode.
(PNO)
This is the parameter number. It is equivalent to the combination of the C1 and C2 characters of the ASCII
mode and is sent as a hexadecimal number rather than two ASCII characters.
(D1), (D2)
These three characters contain both the value and the mode number. The format is explained in
and (D3)
"
DATA FORMAT
".
(CCC)
This is the connection check control character. It contains the checksum of all the characters following the
(EOT) character in the message.
(BCC)
Block check character which is generated by taking the Exclusive OR of the ASCII values of all character
transmitted after and excluding (STX) up to and including (ETX)
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