Data Logger; Modbus ® Register And Functional Description - WIKA GD-20 Manual De Instrucciones

Sensor de densidad de gas
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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
®
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.
®
Function
8 bit
specification, separate messages must be divided by a
®
Data
n x 8 bit
CRC check
16 bit
19
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