054
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DATALOGGER
NI400
NI400
055
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DATALOGGER
NI400
NI400
Click “Next” to proceed the configuration.
Fig.4
shows MODBUS parameters. These are
usually provided by the sensor’s manufacturer and reported in either the datasheet or in-
struction manual.
Modbus Address is sensor’s modbus address, usually settable from the sensor.
Pre Measure Actions:
Some sensors require either a
command or a condition to be true
before actually push-
ing the data in the right register.
Send Command
enabled orders the NI400 to push data (Value field) in a sensor’s regis-
ter (Reg Address (hex)). You can “Force Multiple Reg” o “Write Coil”.
Wait Condition
enabled let NI400 check if Coil, Input or Holding are less, more, equal
or different from a chosen Value. It allows also to wait for a certain time.
Endianess
allows to select if the sensor use a Little Endian or Big Endian data type.
Acquire Measures:
This section is the actual data reading from the modbus sensor. On most sensors, this is
the only section the User should care of.
Measure n
enabled allows NI400 to read the register (Holding, Input or Coil) at the
specified “Reg Address (hex)”. Data Type is Signed or Unsigned Integer, Float and Fix-
end Point.
Register Number&Order
let the User choose which register and in which order data is
stored in. Usually is reported in sensor’s datasheet or instruction manual.
Endianess
allows to select if the sensor use a Little Endian or Big Endian data type.
Post Measure Actions:
As
Pre Measure Actions
, this is not always required, but some sensors need a register
to be written in order to return in standby or reset. Settings are quite similar to
Pre
Measure Actions
’
Send Command
, which can be enabled or not, and actions are
Force
Multiple Reg
,
Write Coil
(Register Address is specified in Reg Address (hex) field) and
Wait Time.
Endianess
allows to select if the sensor use a Little Endian or Big Endian data type.
Figure 52
Figure 53
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