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Important: Please read out the MODBUS byte order of the RMS device with RMS-CONFIG prior to any programming. |
For direct connection to other systems, the device provides a MODBUS TCP server. To following data is available via MODBUS communication:
Description |
Details |
---|---|
Protocol |
MODBUS TCP |
TCP Port |
502 |
oDevice Data
Register |
Parameter |
Data type |
|
---|---|---|---|
30001 |
Serial number |
|
Unsigned 32 Bit |
30002 |
|||
30003 |
Serial number of the probe |
|
Unsigned 32 Bit |
30004 |
oFloat Values
Register |
Parameter |
Data type |
|
---|---|---|---|
31001 |
Value 1 |
Measurement value 1 of the sensor |
Float 32 Bit |
31002 |
|||
31003 |
Value 2 |
Measurement value 2 of the sensor |
Float 32 Bit |
31004 |
oInteger Values
The measurement values are only available in floating format.
The swap mode defines how a float32 value is represented in MODBUS data structure. The settings must be done with the RMS-CONFIG software.
Factory settings: WORD-Swap
Example:
Value 1 (Address 31001 / 31002) |
45.0 = 0x42340000 |
Value 2 (Address 31001 / 31002) |
1000.0 = 0x447A0000 |
The following website helps for conversion: https://www.h-schmidt.net/FloatConverter/IEEE754de.html
The RMS LAN devices (except the RMS-Converter) are based on a Little Endian memory organisation (The device firmware provides the MODBUS information starting with the most significant byte.)
NoChange (Little Endian) |
Word Swap (Middle Endian) |
||||
---|---|---|---|---|---|
31001 |
0 |
0x0000 |
31001 |
13378 |
0x3442 |
31002 |
13378 |
0x3442 |
31002 |
0 |
0x0000 |
31003 |
0 |
0x0000 |
31003 |
31300 |
0x7A44 |
31004 |
31300 |
0x7A44 |
31004 |
0 |
0x0000 |
Byte Swap (Mixed Endian) |
Byte and Word Swap (Big Endian) |
||||
31001 |
0 |
0x0000 |
31001 |
16948 |
0x4234 |
31002 |
16948 |
0x4234 |
31002 |
0 |
0x0000 |
31003 |
0 |
0x0000 |
31003 |
17530 |
0x447A |
31004 |
17530 |
0x447A |
31004 |
0 |
0x0000 |
The logger is designed for use with the RMS server software (local installation or Rotronic Cloud). The data logger can alternatively also be operated with the RMS-Configuration software (standalone software).
Connection timeout: When TCP connection is open and for more than 30 seconds no communication is performed, the device automatically closes the TCP connection. In case of a communication interruption, this prevents the socket being blocked.
Additional MODBUS details can be found here: MODBUS in RMS.
Updated: 13.12.2023.