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<< Click to Display Table of Contents >> Navigation: Hardware Overview > Input and Output Devices > RMS-DO-L-R > Modbus |
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. Following data is available via MODBUS communication:
Description |
Details |
|---|---|
Protocol |
MODBUS TCP |
TCP Port |
502 |
MODBUS register
Device data (FC4: Read Input Registers)
Address |
Number |
Parameter |
Data type |
Comment |
|---|---|---|---|---|
30000 |
2 |
Serial number |
Unsigned 32 Bit |
SN in Hex: e.g. 01ACCBE1 = 28101601 |
Output (FC1: Read Coils)
Address |
Number |
Parameter |
Data type |
Comment |
|---|---|---|---|---|
0000 |
16 |
Status of digital outputs |
Unsigned 16 Bit |
Bit 0 = status of output 1 Bit 1 = status of output 2 |
(FC5: Write Single Coil)
Address |
Number |
Function |
Data type |
Comment |
|---|---|---|---|---|
0000 0001 |
1 |
Relays: set Relays: reset |
Unsigned 16 Bit |
FF00: set relay 0000: reset relay |
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 |
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.