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1 GENERAL
This document specifies the ASCII serial communications protocol used to transfer data between a master
computer station and the PM172EH. The document provides the complete information necessary to develop a
third-party communications software capable of communication with the Series PM172EH instruments.
All messages within the ASCII communications protocol are designed to consist only of printable characters.
Additional information concerning communications operation, configuring the communications parameters and
communications connections is found in "Series PM172EH Powermeters Installation and Operation Manual".
IMPORTANT
1. 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 can be used.
2. In 4LN3, 4LL3, 3LN3 and 3LL3 wiring modes, harmonic voltages will be line-to-neutral voltages; in other
modes, they will be line-to-line voltages. In a 3-wire direct connection, harmonic voltages and waveforms
will represent line-to-neutral voltages as they appear on the instrument's input transformers. In 3OP2 and
3OP3 wiring modes, voltage harmonics and waveforms will be given only for phases L12 and L23.
1. Most of the advanced features are configured using multiple setup parameters that can be accessed in some
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.
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