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VA 500 Bi-directional English 1.24 Seite 37 von 56
11.3.2 Modbus Settings
11.3.2.1 Modbus RTU Setup
The Flow sensors VA 500 comes with a Modbus RTU Interface.
Before commissioning the sensor the communication parameters
• Modbus ID, Baudrate, Parity und Stop bit
must be set in order to ensure the communication with the Modbus master.
Settings → Modbus Setup
Default values out of factory: Modbus ID: 1
Baud rate: 19200
Stopbit: 1
Parity: even
Byte Order: ABCD
Remark: If the sensor is placed at the end of the Modbus system a termination is required. The sensors have an
internal switchable termination, therefore the 6 fastening screws from the lid are to be released and set the
internal DIP Switch to “On”.
Alternatively, a 120R resistor can be installed in the plug between pin 2 and pin 4.
For changes, e.g. the sensor ID,
first select by pressing key „“ the field
“ID” and then key “OK”.
Select the desired position by pressing the
">" and select with "OK" button.
Change values by pressing the „“ values
takeover by pressing "OK".
Inputs for baudrate, stopbit and parity is
done analogue.
By means of the button "Byte Order" it is
possible to change the data format (Word
Order). Possible formats are "ABCD" (Big
Endian) and "CDAB" (Middle Endian)
Saving the changes by pressing "Save",
therefore select it with key „“ and then
confirm it with "OK".
To set back to default values please press
button “Set to Default”
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