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83
Serial Communications – continued
Function codes 03 (read holding registers) and 04 (read input registers) are the only codes supported for reading
these registers, and function codes for writing holding registers are not implemented. We recommend that the
floating point and long integer registers be read in a single operation with the number of registers being a multiple of
two. If these data are read in two separate operations, each reading a single 16-bit register, then the value will likely
be invalid.
The floating point registers with values in display units are scaled to the same units as are displayed, but are
instantaneous values that are not smoothed. If display smoothing is enabled (non-zero value entered in the Display
TC item in the Display Menu), then the register values will not agree exactly with the displayed values.
Table 4-2.Register Definitions
