Vega VEGAFLEX 83 Modbus and Levelmaster protocol PFA in Manual de usuario Pagina 74

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11 Supplement
VEGAFLEX 83 • Modbus and Levelmaster protocol
41838-EN-130314
data transfer. In the RTU and ASCII mode interesting here, data will be transmitted in binary form.
The telegram consists generally of the address, the function, the data as well as the transmission
check.
Bus architecture
In the version Modbus RTU, up to 32 participants can be connected to the bus. The length of the
twisted two-wire cable can be up to 1200 m. The bus must be terminated on both sides at the last
bus participant with a terminating resistor of 120 Ohm. The resistor is already integrated in the
VEGAFLEX 83 and is activated/deactivated via a slide switch.
4
1
3 3 3
2
+
+
power supply
MODBUS
D0
D1
IS GND
USB
+
+
power supply
MODBUS
D0
D1
IS GND
USB
+
+
power supply
MODBUS
D0
D1
IS GND
USB
1345
2off
on
( )
(
)
(-)
(-)
1345
2off
on
( )
(
)
(-)
(-)
1345
2off
on
( )
(
)
(-)
(-)
Fig. 40: Bus architecture Modbus
1 RTU
2 Connection resistor
3 Bus participant
4 Voltage supply
Protocol description
The VEGAFLEX 83 is suitable for connection to the following RTUs with Modbus RTU or ASCII
protocol.
RTU Protocol
ABB Totalow Modbus RTU, ASCII
Bristol ControlWaveMicro Modbus RTU, ASCII
Fisher ROC Modbus RTU, ASCII
ScadaPack Modbus RTU, ASCII
Thermo Electron Autopilot Modbus RTU, ASCII
Parameters for the bus communication
The VEGAFLEX 83 is preset with the default values:
Parameter CongurableValues Default Value
Baud Rate 1200, 2400, 4800, 9600, 19200 9600
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