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Communication Menu
10.2.2 Input/Output data
The main board:
• Writes the latest measurement data to the Profibus Input Buffer.
• Checks if a command written by the Profibus Master must be executed (Profibus Output
Buffer). If a command is to be executed, the instrument executes it and writes the result
(status, data, etc.) in the Profibus Input Buffer.
All numbers are coded in “Big Endian” format, and float values are coded according to IEEE
Standards. The field types “Byte” and “Double Word” are unsigned.
Measurements
Measurements are formatted in the Profibus Input Buffer as follows:
Note: The table above shows information for a 2-channel instrument. This will be adjusted according to the
number of channels in use.
Name Type Size Offset
Barometric pressure Input float 32 bits 0
Barometric pressure unit Input byte 8 bits 4
Channel 1 gas concentration Input float 32 bits 5
Channel 1 gas unit Input byte 8 bits 9
Channel 1 temperature Input float 32 bits 10
Channel 1 temperature unit Input byte 8 bits 14
Channel 1 external pressure Input float 32 bits 15
Channel 1 external pressure unit Input byte 8 bits 19
Channel 1 events Input double word 32 bits 20
Channel 1 measurement index Input double word 32 bits 24
Channel 2 gas concentration Input float 32 bits 28
Channel 2 gas unit Input byte 8 bits 32
Channel 2 temperature Input float 32 bits 33
Channel 2 temperature unit Input byte 8 bits 37
Channel 2 external pressure Input float 32 bits 38
Channel 2 external pressure unit Input byte 8 bits 42
Channel 2 events Input double word 32 bits 43
Channel 2 measurement index Input double word 32 bits 47
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