Logic Beach offers two families of electrical meter transducers that readily interface to our data logging instruments. Depending on the model, the meter to data logger interface can be Modbus RTU and/or a simple Pulse output.
PowerScout: The PowerScout line of meters offers both Modbus RTU and Pulse outputs in a single unit.
Wattnode: The Wattnode line offers the WNC Modbus only output meters and the WNB Pulse only output meters. Specifics on Modbus RTU interface vs Pulse interface follow.
Modbus RTU Interface
For applications requiring detailed electrical power information with multiple electrical parameters, Logic Beach offers Modbus RTU enabled electrical parameter meters. These meters can measure electrical loads and provide multiple electrical parameters via a Modbus RTU interface including power (kW), energy (kWh), phase voltages, phase currents, power factor and much more.
The IntelliLogger family of data loggers configured as a Modbus RTU Master can interrogate and log user specified parameters from one or more connected Modbus RTU Slave power meters. Simultaneous with the readings logged via the Modbus interface, the IntelliLogger can be sampling, processing, logging and reporting hard-wired inputs (e.g. thermocouples, pressures, flows, etc) as well.
The Modbus RTU interface uses a two-wire serial RS-485 connection between the IntelliLogger and the meters. Each device (meter or other Modbus Slave device on the RS-485 network) is assigned a unique device address allowing up to 15 Modbus devices to be connected to a single IntelliLogger.
Details on the various Modbus connected multi-parameter meters follow. Additional details on Modbus and the Modbus option for the IntelliLogger data logging instrument family are available on the IntelliLogger Modbus Interface Options page.
Pulse Output Interface
For applications requiring only energy logging (kWh), electrical meters equipped with pulse outputs (instead of Modbus) can be utilized. Meters with pulse outputs output a switch closure “pulse” that corresponds to some unit of energy measured. By totalizing the pulses over a period of time (eg 15 minute utility intervals) and appropriate scaling within the Logic Beach logger, the energy usage can be profiled.
Additionally, Pulse Output meters can be used to garner instantaneous Power (demand) by measuring the frequency of the energy pulse output. Logic Beach data loggers can be readily programmed to perform the necessary calculations to determine instantaneous power from the Energy pulse output allowing two commonly desired electrical parameters to be logged from a single lower cost Pulse Output meter.