Telegram Sequence; Variable Code; Telegram Examples - WEG CFW-09 User Manual

CHAPTER 8 - CFW-09 OPTIONS AND ACCESSORIES
8.13.3.6

Telegram Sequence

8.13.3.7

Variable Code

8.13.4 Telegram Examples

1) Master:
EOT
2) Inverter:
G
306
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
be guaranteed, between two telegrams addressed to the same inverter (refer
to item 8.13.6).
The field designated with CODE contains the parameter address and the
basic variables formed by 5 digits (ASCII characters) as follows:
CODE
Change of the minimum speed (P133) to 600 rpm in the inverter 7.
G STX 0 2
Address 7
ACK
X X X X
8 3 3 =
NMIN Code
+ T
proc di
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)
0H 2H 5H 8H
NMIN = 600 = 258H
+ T cit should
txi
ETX BCC