Parameters/Variables Resolution; Characters Format; Protocol - WEG CFW-09 User Manual

8.13.3.2 Parameters/Variables
Resolution
8.13.3.3 Characters
Format

8.13.3.4 Protocol

CHAPTER 8 - CFW-09 OPTIONS AND ACCESSORIES
SCHEMATIC DIAGRAM:
INVERTER
BASIC
VARIABLES
PARAMETERS
During the parameter reading/changing the decimal point is disregarded in the
values received with the telegram, excepting the Basic Variables V04 (Reference
via Serial) and V08 Motor Speed) that are standardized in 13 bits (0 to 8191).
For instance:
Writing: if the purpose is to change the content of P100 to 10.0 s, you
must send 100 (disregarding the decimal point);
Reading: If we read 1387 in P409, the value is 1.387 (the decimal point
is disregarded);
Writing: to change the content of V04 to 900 rpm, we must send:
V04 = 900 x
Supposing P208 = 1800 rpm
Reading: If we read 1242 in V08, this value is given by:
V08 = 1242 x
Supposing P208 = 1800 rpm
1 start bit;
8 information bits [they codify text characters and transmission characters,
removed from the 7 bits code, according to ISO 646 and complemented
for even parity (eighth bit)];
1 stop bit.
After the start bit, follows the less significant bit:
START B1 B2 B3
Start
bit
The transmission protocol meets Standard ISO 1745 for data transmission in
code. Only text characters sequences without header are used.
The errors monitoring is made through transmission related to the parity of the
individual 7 bit characters, according to ISO 646. The parity monitoring is
made according to DIN 66219 (even parity).
The master uses two types of messages:
SERIAL CONECTION
VARIABLES
8191
= 4096
P208
P208
= 273 rpm
8191
B4 B5 B6 B7
8 bits of information
MASTER
B8 STOP
Stop
bit
303