
Chapter 8 - Appendices
584S Frequency Inverter
8 -13
Types of Messages
Types of Messages
Types of Messages
Types of Messages
As described above there are two types of message:
Main Messages
Main Messages
Main Messages
Main Messages
The main messages are in four types:
1.
Selection
The supervisor writes to one parameter.
(EOT)
(INO)
(CCC)
(STX)
(PNO)
(D1)
(D2)
(D3)
(ETX)
(BCC)
where the (BCC) character contains the checksum of all characters following the (STX).
2.
Polling
The supervisor requests to read the value of one parameter.
(EOT)
(INO)
(PNO)
(CCC)
(ENQ)
3.
Enquiry Polling
The supervisor requests to read all those parameters in block 1 that have changed since the last read by an amount
greater than or equal to changeband (PNO 4).
(EOT)
(INO)
(CCC)
(ENQ)
4.
Multi-parameter polling
The supervisor requests to read a given number of parameters. That number is referred to as the count number
("CNO"), it is included in the request message and the reply will be sent by the drive in blocks of up to 8 parameters.
(EOT)
(INO)
(PNO)
(CNO)
(CCC)
(ENQ)
NOTE: The CCC is the checksum of the characters following an (EOT) and is therefore equal to (INO) in
selection and enquiry-polling messages.
If PNO is the first in a block (i.e. 0, 8, 16, etc.) and CNO = 8, then a pseudo - enquiry poll is performed on the block,
controlled by PNO 7. Further details are given in the 'Serial Link' menu option described in Chapter 4.
Continuation messages:
Continuation messages:
Continuation messages:
Continuation messages:
In addition to the above, there are two types of continuation message (sent by the supervisor).
1.
Next :
(send next item from a list)
Only valid if sent following a multi-parameter poll.
(ACK)
2.
Repeat :
(repeat last reply)
Only valid if sent following any type of poll. It requests a repetition of the previous
reply. (NAK)
This manual was downloaded on www.sdsdrives.com
+44 (0)117 938 1800 - [email protected]
Содержание 584S
Страница 122: ...This manual was downloaded on www sdsdrives com 44 0 117 938 1800 info sdsdrives com ...
Страница 173: ...This manual was downloaded on www sdsdrives com 44 0 117 938 1800 info sdsdrives com ...
Страница 174: ...This manual was downloaded on www sdsdrives com 44 0 117 938 1800 info sdsdrives com ...
Страница 175: ...This manual was downloaded on www sdsdrives com 44 0 117 938 1800 info sdsdrives com ...