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CHAPTER 8 - CFW-09 OPTIONS AND ACCESSORIES
Writing telegram:
No answer: with wrong telegram structure, control characters received
incorrectly or wrong inverter address;
NAK: code corresponding to the variable does not exist, wrong BCC
(checksum byte), only reading variable, VAL out of the allowed range for
the respective variable, operation parameter out of the alteration mode;
ACK: with valid telegrams.
The master should maintain, between two variable transmissions to the
same inverter, a waiting time that is compatible with the used inverter.
In the inverters, the telegrams are processed in determined time intervals.
Therefore, a pause larger than the sum of the times T
proc
+ T
di
+ T
txi
cit should
be guaranteed, between two telegrams addressed to the same inverter (refer
to item 8.13.6).
8.13.3.6
Telegram Sequence
8.13.3.7
Variable Code
The field designated with CODE contains the parameter address and the
basic variables formed by 5 digits (ASCII characters) as follows:
8.13.4 Telegram Examples
Change of the minimum speed (P133) to 600 rpm in the inverter 7.
1) Master:
EOT
G
STX
0
2
8
3
3
=
0H
2H
5H
8H
ETX
BCC
NMIN Code
NMIN = 600 = 258H
Address 7
CODE
X
X
X
X
X
Number of the basic variable
Equipment number:
"8" = CFW-09
"9" = any inverter
Specifier:
0 = basic variables
1 = P000 to P099
2 = P100 to P199
3 = P200 to P299
4 = P300 to P399
5 = P400 to P499
6 = P500 to P599
7 = P600 to P699
Equal to zero (0)
2) Inverter:
G
ACK
