Siemens SITRANS LG270 Operating Instructions Manual page 85

4
+
( )
1
Fig. 52: Bus architecture Modbus
1 RTU
2 Connection resistor
3 Bus participant
4 Voltage supply
Protocol description
The SITRANS LG270 is suitable for connection to the following RTUs with Modbus RTU or ASCII
protocol.
RTU
ABB Totalflow
Bristol ControlWaveMicro
Fisher ROC
ScadaPack
Thermo Electron Autopilot
Parameters for the bus communication
The SITRANS LG270 is preset with the default values:
Parameter
Baud Rate
Start Bits
Data Bits
Parity
Stop Bits
Address range Modbus
Start bits and data bits cannot be modified.
PBD-51041066
USB
MODBUS
power supply
1 2 off on 3 4 5
(-)
3
Configurable Values
1200, 2400, 4800, 9600, 19200
1
7, 8
None, Odd, Even
1, 2
1 ... 255
SITRANS LG270 - Operating Instructions
USB
MODBUS
power supply
+ 1 2 off on 3 4 5
( ) (-)
3
Protocol
Modbus RTU, ASCII
Modbus RTU, ASCII
Modbus RTU, ASCII
Modbus RTU, ASCII
Modbus RTU, ASCII
Default Value
9600
1
8
None
1
246
USB
MODBUS
power supply
+ 1 2 off on 3 4 5
( ) (-)
3
2
85