8
1 General
This document specifies a subset of the Modbus serial communications protocol used to
transfer data between a master computer station and the PM130. The document provides
the complete information necessary to develop third-party communications software
capable of communication with Series PM130 devices. For additional information concerning
operating the device, configuring the communication parameters, and communication
connections see the PM130 PLUS Installation and Operation Manual.
The document is applicable to PM130A, PM130P, PM130E and PM130EH meters.
IMPORTANT
In 3-wire connection schemes, the unbalanced current and phase readings for power factor,
active power, and reactive power will be zeros, because they have no meaning. Only the
total three-phase power values are provided.
Most of the advanced features are configured using multiple setup parameters that can be
accessed in a number of contiguous registers. When writing the setup registers, it is
recommended to write all the registers at once using a single request, or to clear (zero) the
setup before writing into separate registers.
Designations used in the guide:
E - available in the PM130E and PM130EH
EH - available in the PM130EH
Provided
by
Northeast
Power
Systems,
Inc.
www.nepsi.com