Data Logger; Modbus ® Register And Functional Description - WIKA GD-20 Series Operating Instructions Manual

5. Commissioning, operation

5.4.2.3 Data logger

The data logger is used for recording measured values over a certain time span.
After setting up COM ports, the baud rate and the min./max. address or interval, the
recording can be started. For continuous recording, it is possible to record the measured
data in the selected interval in a text file divided by tabs.
The recording is started with the green start symbol. Stop the recording using the red
stop symbol.
5.4.2.4 Modbus register and functional description
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The following documents (available under www.Modbus.org) are recommended for
understanding the Modbus
Modbus APPLICATION PROTOCOL SPECIFICATION
■
Modbus over Serial Line Specification and Implementation Guide
■
The register structure is described in the following.
Communication via messages
General form of the messages
Instrument
address
8 bit
In accordance to Modbus
break of at least 3.5 characters.
WIKA operating instructions gas density sensor, model GD-20
architecture which the following chapters will refer to.
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Function
8 bit
specification, separate messages must be divided by a
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Data
n x 8 bit
CRC check
16 bit
19
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