Teledyne Analytical Instruments LXT-380, Instructions Manual

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Appendix LXT-380 Universal Transmitter
Teledyne Analytical Instruments
74
C. MODBUS RTU REGISTER LISTING
03 (0X03) READ HOLDING REGISTERS
This function code is used to read the contents of a contiguous
block of holding registers in a remote device. The Request Protocol Data
Unit specifies the starting register address and the number of registers.
In the Protocol Data Unit Registers are addressed starting at zero.
Therefore registers numbered 1-16 are address as 0-15.
The register data in the response message are packed as to bytes per
register, with the binary contents right justified within each byte. For
each register, the first byte contains the high order bits and the second
contains the low order bits.