West Control Solutions KS 800 ISO1745 Interface Manual - Manual (Page 9)

Bem. E Addition selection criteria
In order to form a purposeful sub-set from the variety of data, additional selection criteria are defined:
q Function block number
A function block is addressed by a function block number. It is within ‘0’ and ‘250’ and is appended to
the code field by means of a comma.‘<code>,<function block no.>’
Function block number ranges:
w 0general data for the overall instrument
w 1 - 99fixed function blocks
w 100 - 250variable function blocks
q
Function number
A function as a partial address of a function block is addressed with a function number. It is within ‘0’
and ‘99’ and is appended to the function block number by means of a comma.
‘<code>,<function block no.>,<function no.>’
Function number ranges:
w 0 - 99Functions
w 0Function General, Default, unless a no. is specified
Bem. F Safety procedure
Correct transmission of a message is supported by two safety procedures:
w check of each message byte by formation of parity (1 bit per 7 data bits)
w Check by Block Check Count : safety section, which connects all characters of a message between STX
(excl.) and ETX (incl.) bytewisely by a logic XOR function; length 1 byte, follows always after ETX.
3.2 Basic message structure
Message structure with data transmission:
Computer sends
to KS 800:
EOT STX ETX BCC
<addr> <data>
KS 800 replies: ACK or NAK in case of error
Message structure with data enquiry:
Computer requests: EOT ENQ
<addr> <ident>
KS 800 replies: STX ETX BCC or NAK in case of error
<data>
Message structure
9 9499 040 49411