Data Character (Byte) - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide
2. Address format 1-126
The byte for address range 1 - 126 has
the shown profile:
Bit 7 = 1 (address format 1-126 active)
Bit 0-6 = Adjustable frequency drive address 1-126
Bit 0-6 = 0 Broadcast
The slave returns the address byte unchanged to
the master in the response telegram.
Example:
Writing to adjustable frequency drive address
22 (16H) with address format 1-31:
Data control byte (BCC)
The data control byte is explained in this example:
Before the first byte in the telegram is received,
the Calculated CheckSum (BCS) is 0.
When the first byte (02H) is received:
BCS = BCC EXOR "first byte"
(EXOR = exclusive-or)
Each subsequent byte gates with BCS EXOR
and produces a new BCC, e.g.:

Data Character (byte)

"
The structure of data blocks depends on the type of telegram. There are three telegram types,
and the type applies for both control telegrams (master=>slave) and response telegrams
(slave=>master). The three types of telegram are:
Parameter block: Used to transfer parameters
between master and slave. The data block
is made up of 12 bytes (6 words) and also
contains the process block.
* default setting ( )
How to Program
display text [ ] value for use in communication via serial communication port
MG.33.B3.22 - VLT is a registered Danfoss trademark
BCS = 0 0 0 0 0 0 0 0 (00 H)
EXOR
1. byte = 0 0 0 0 0 0 1 0 (02H)
BCC = 0 0 0 0 0 0 1 0 (02H)
BCS = 0 0 0 0 0 0 1 0 (02H)
EXOR
2nd byte = 1 1 0 1 0 1 1 0 (D6H)
BCC = 1 1 0 1 0 1 0 0 (D4H)
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