Modbus Register Map

About these Registers:

DEVICE_ID / REMOTE_TERMINAL_UNIT (RTU) / SLAVE_ID:

Each sensor on a single multi-drop bus line must have a unique DEVICE_ID / RTU / SLAVE_ID:
By Default the DEVICE_ID / RTU / SLAVE_ID is the LAST 2 DIGITS OF THE SENSORS SERIAL NUMBER
The serial number (and therefore, the RTU number) can be found on the side of the TwinProx on the white label.

INDEXING:

Note that the listed registers below are considered 0-Indexed (the first value starts at 0)
Some Modbus masters will need to shift all the values up by one value if their master recognized the first Modbus value at 1 (known as 1-indexed).

SERIAL COMMUNICATION SETTINGS:

Baudrate: 115200
Parity: None
Handshakes: None
Data Bits: 8
Stop Bits: 1

FUNCTION CODES:

The function codes supported by TwinProx Sensor are:

03 - (0x03) READ MULTIPLE HOLDING REGISTERS 
16 - (0x10) WRITE MULTIPLE HOLDING REGISTERS

--- If you want to read or write to just a single register, you can do this by setting the length/offset/number of registers to 1 ---

Endianness:

The TwinProx sensor uses the Big Endian memory allocation paradigm.

In computingendianness is the order or sequence of bytes of a word of digital data in computer memory. Endianness is primarily expressed as big-endian (BE) or little-endian (LE). A big-endian system stores the most significant byte of a word at the smallest memory address and the least significant byte at the largest. A little-endian system, in contrast, stores the least-significant byte at the smallest address.

Modbus Register Map

Register Address Number of Registers Register Contents Description Range Default Value Scale Unit  Data Type Read / Write Notes
40176 1 Channel A Gap / Distance   n/a   mils 16-bit Unsigned Integer R  
40177 1 Channel B Gap / Distance   n/a   mils 16-bit Unsigned Integer R  
40178 1 Channel A Displacement   n/a   mils Pk-Pk 16-bit Unsigned Integer  
40179 1 Channel B Displacement   n/a   mils Pk-Pk 16-bit Unsigned Integer  R  
40201 2 Channel A Temperature   n/a   Celcius

32-bit Floating Point

R  
40203 2 Channel B Temperature   n/a   Celcius

32-bit Floating Point

R  

 

 


Revision #3
Created 10 October 2023 15:03:31 by Bach_L
Updated 10 October 2023 15:57:22 by Bach_L