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19 MODBUS-Parameters
19.1 General
RS 485 serial interface on LMA/B uses Modbus RTU protocol for data transmission, according to
Modbus standards. Protocol includes several parameters, which give access to all relevant sensor
information, distance measurement values and sensor settings.
Read-Only parameters cannot be changed by the user. R/W parameters are used for the sensor set-
up. The function of Write-Only parameters is to generate actions internally; no data transmission
occurs.
Modbus function
0x03
R
Read Holdingregister (16 and 32 Bit)
0x04
R
Read Inputregister (16 and 32 Bit)
0x06
W
Write 16 Bit Register
0x16
W
Write 32 Bit Register
LSW values are to be addressed via the MSW register only.
Units
Distance
mm
millimeter
Time
ms
millisecond
Temperature
°C
degree Celsius
Configuration of Modbus Register, information on Modbus: www.modbus.org
An overview of all Modbus-Register of LMA/B is given under chapter 19.2
19.2 MODBUS RTU
– Register address
Note: Two register addresses are available for certain registers. Here values are 32-bit values which
can be written and read only in combination. To allow this, the MSW register is written in a data
double-length. Register writing occurs via function 16 while reading via function 3, in both cases the
number of registers is 2.
.
Units
Distance
mm
millimeter
Time
ms
millisecond
Temperature
°C
degree Celsius
List of the MODBUS register addresses
Register
address
R/W Description
Note
(value range)
Value length
different from 16 Bit
factory
default
0
R
Version
P0161
1
R
Sub-Version
2
R
Proxitron device serial number
3
R/W Slave Adresse
1
4
R
Internal temperature in [°C]
5
R
Max. temperature in [°C]
6
R
Min. temperature in [°C]
