Modbus Register - Siemens SITRANS LG260 Operating Instructions Manual

protocol.
RTU
ABB Totalflow
Bristol ControlWaveMicro
Fisher ROC
ScadaPack
Thermo Electron Autopilot
Parameters for the bus communication
The SITRANS LG260 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.
General configuration of the host
The data exchange with status and variables between field device and host is carried out via
register. For this, a configuration in the host is required. Floating point numbers with short prevision
(4 bytes) according to IEEE 754 are transmitted with individually selectable order of the data bytes
(byte transmission order). This "Byte transmission order" is determined in the parameter "Format
Code". Hence the RTU knows the registers of the SITRANS LG260 which must be contacted for the
variables and status information.
Format Code
0
1
2
3

10.3 Modbus register

Holding Register
The Holding registers consist of 16 bit. They can be read and written. Before each command, the
address (1 byte), after each command, a CRC (2 byte) is sent.
PBD-51041059
Configurable Values
1200, 2400, 4800, 9600, 19200
1
7, 8
None, Odd, Even
1, 2
1 ... 255
SITRANS LG260 - Operating Instructions
Protocol
Modbus RTU, ASCII
Modbus RTU, ASCII
Modbus RTU, ASCII
Modbus RTU, ASCII
Modbus RTU, ASCII
Default Value
9600
1
8
None
1
246
Byte transmission order
ABCD
CDAB
DCBA
BADC
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