Modbus Register Data Address Data Description
30903 0902 Tank 2, Mass High Word
30904 0903 Tank 2, Mass Low Word
30905 0904 Tank 3, Mass High Word
30906 0905 Tank 3, Mass Low Word
30907 0906 Tank 4, Mass High Word
30908 0907 Tank 4, Mass Low Word
30909 0908 Tank 5, Mass High Word
30910 0909 Tank 5, Mass Low Word
30911 0910 Tank 6, Mass High Word
30912 0911 Tank 6, Mass Low Word
30913 0912 Tank 7, Mass High Word
30914 0913 Tank 7, Mass Low Word
30915 0914 Tank 8, Mass High Word
30916 0915 Tank 8, Mass Low Word
1. All registers can be accessed using either Modbus Function 03 (Read Holding Registers)
or Modbus Function 04 (Read Input Registers). However, all registers are read-only in
this implementation.
For example:
Registers 30001 and 30002 (using Function 03) can also be read as registers 40001 and
40002 (using Function 04).
2. Level 1 = product level.
3. Pairs of registers identified as ‘High Word’ and ‘Low Word’ must be read together and
concatenated by the master to form a 32-bit ‘long word’ quantity.
For example:
Register 30001 (16-bit high word) = 0002H
Register 30002 (16-bit low word) = 3F8CH
Long word (32-bit) = 00023F8CH (decimal 147340)
Or:
Register 30001 (high word) = 2
Register 30002 (low word) = 16268
Multiply register 30001 x 65536 : 2 x 65536 = 131072
Add result to register 30002 : 131072 + 16268 = 147340
4. All registers identified as ‘(x 100)’ or ‘(x 1000)’ have been scaled (multiplied) by a fac-
tor of 100 or 1000 before transmission to preserve the fractional portion of the data
value. The master must divide these values by the scale factor as necessary.
For example:
Register 30001 (16-bit high word) = 0002H
Register 30002 (16-bit low word) = 3F8CH
Long word (32-bit) = 00023F8CH (decimal 147340)
Divide by 1000, actual value = 147.340
5. Level 2 = interface level.
6. Average submerged temperature (as polled from DDA tank gauge).
110
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