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ZL0093-0A
11/2011
EM3555
Modbus Point Map
Legend
The following table lists the addresses assigned to each data point. For oating
point format variables, each data point appears twice because two 16-bit
addresses are required to hold a 32-bit oat value. Negative signed integers are
2’s complement.
R/W
R=read only
R/W=read from either integer or oat formats, write only to integer
format.
NV
Value is stored in non-volatile memory. The value will still be available if
the meter experiences a power loss and reset.
Format
UInt Unsigned 16-bit integer.
SInt Signed 16-bit integer.
ULong Unsigned 32-bit integer; Upper 16-bits (MSR) in lowest
numbered / rst listed register (001/002 = MSR/LSR).
SLong Signed 32-bit integer; Upper 16-bits (MSR) in lowest
numbered / rst listed register (001/002 = MSR/LSR).
Float 32-bit oating point; Upper 16-bits (MSR) in lowest numbered
/ rst listed register (257/258 = MSR/LSR). Encoding is per
IEEE standard 754 single precision.
Units Lists the physical units that a register holds.
Scale
Factor
Some Integer values must be multiplied by a constant scale factor
(typically a fraction), to be read correctly. This is done to allow integer
numbers to represent fractional numbers.
Range Denes the limit of the values that a register can contain.
SunSpec Alliance Interoperability Specification Compliance
This meter implements the draft SunSpec 1.0 common elements starting at
base 1 address 40001, and the proposed SunSpec 1.1 meter model at 40070
(these addresses are not in Modicon notation). See www.sunspec.org for copies
of these specications.