Weidmuller Power Monitor Handbuch Seite 188

Communications
• Block check code Bcc (H), (L)
◊ Two-digit hexadecimal 00 to FF (ASCII codes)
◊ These are codes (horizontal parity) that are used to detect errors in the transmitted data.
◊ If "**" is entered instead of "Bcc", however, messages can be transmitted without the Bcc. In this case,
the Bcc is included with the response
• Error code Err (H), (L)
◊ Two- digit hexadecimal 00 to FF (ASCII codes)
◊ These indicate the content if an error occurs.
Bcc (Block Check Code)
• The Bcc is a code that carries out an error check using horizontal parity, to improve the reliability of the
data being sent.
• The Bcc uses an exclusive OR from the header (%) to the final character of the text, and converts the 8- bit
data into a 2-character ASCII code.
Example:
% 0
↑
Header Station No.1
% 0
25H 30H
66
1 #
↑ ↑
Command
1 #
31H 23H
①
Takes exclusive OR
R T 0
↑ ↑
RT 2-character
Command Bcc
R T 0
52H 54H
1 CR
1
Bcc(H)=0(30H)
Bcc(L)=1(31H)
②
Converts to ASCII format
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