Modbus is an old protocol and the de facto standard for building and industrial automation. The
register map is available on page 39. Several third party software vendors offer software already
configured to the EZMeter register map. Meters can be ordered for either big (default) or little
endian and either signed (default) or unsigned integers.
Bi-directional Meters. All one, two and three element meters are available as bi-directional meters
that measure the number of kwh that flow in each direction. These meters are most often used in
conjunction with solar, wind or other alternative energy systems connected to the grid.
Voltage. Each EZMeter must be ordered to match the electric system where it will be installed. The
first character of the model number determines the voltage range the meter can handle.
Note: Each meter model is capable of handling a range of voltages. Select the meter with the
voltage range that includes the voltage you want to measure.
A. 100-130 volts to neutral, 200-260 volts line to line, single output:
Single element: 100-130 volts to neutral, single phase.
Two element: 100-130 volts to neutral, 200-260 volts line to line, single phase or two phases of
a three phase system.
Three element: 100-130 volts to neutral, four wire, three phase wye.
A. 100-130 volts to neutral, 200-260 volts line to line, dual output:
Two element: Two 100-130 volts to neutral, single phase services or
One bidirectional 100-130 volts to neutral, 200-260 volts line to line, single phase or two phases
of a three phase system.
Three element: One 100-130 volts to neutral, single phase plus one 100-130 volts to neutral,
200-260 volts line to line, single phase or two phase of three phase system, or one
bidirectional 100-130 volts to neutral, four wire, three phase wye.
Four Element: Two 100-130 volts to neutral, 200-260 volts line to line, single phase or two
phases of three phase system.
B. Three element only: 100-130 volts to neutral on two legs, 200-260 volts to neutral on the third
leg, 200-260 volts line to line, four wire, three phase delta. Can also be used in place of an A
single output meter with a slight loss of accuracy at the low end on L3.
C. 200-260 volts to neutral, 400-500 volts line to line
Single element: 200-260 volts line to neutral, single phase
Two element: 200-260 volts to neutral, 400-500 volts line to line, or two phases of three phase.
Three element: 200-260 volts to neutral, 400-500 volts line to line, three phase wye
D. 240-300 volts to neutral, 430-500 volts line to line
Single element: 240-300 volts line to neutral, single phase
Two element: 240-300 volts to neutral, 430-500 volts line to line, or two phases of three phase.
Three element: 240-300 volts to neutral, 430-500 volts line to line, three phase wye
When used with the EZMeter Technologies Phantom Neutral module, this meter will monitor
a three-wire, three phase delta service.
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