3300 ACM Installation and Operation Manual Power Measurement Ltd.
5-4 Communications
5.7 THIRD-PARTY SYSTEM
COMPATIBILITY
3300 ACM communications uses an advanced object and
register based open protocol which supports an efficient
exception reporting methodology. This allows the 3300 ACM
to be easily adapted to third-party PLC, DCS, EMS, and
SCADA systems. Currently, the 3300 ACM provides compat-
ibility with the Modicon Modbus (see Section 5.8). This
feature is provided as part of the basic model 3300 ACM, and
is user-selectable using the PROTOCOL parameter.
All data and configuration registers are accessible via commu-
nications. All configuration and control operations have
imbedded password protection.
A complete description of the Power Measurement 3300 ACM
communications protocol is provided in Appendix G.
Contact Power Measurement or your local Power Measure-
ment representative for complete documentation on the 3300
ACM / Modbus communications protocol, or to discuss a
specific application.
5.6 3300 RDT REMOTE DISPLAY
TERMINAL
The 3300 RDT is a low cost display terminal which provides
remote monitoring of up to thirty-two 3300 ACM's from a
single location using RS-485 communications. The rugged
design of the 3300 RDT makes it the ideal display terminal for
both industrial and commercial applications which do not
require sophisticated SCADA system capabilities.
The 3300 RDT looks and acts identical to the 3300 ACM by
offering the same data presentation formats. The 3300 RDT
will automatically upload and display readings for all
measured parameters from any connected 3300 ACM meter,
with no additional setup required. Since the 3300 RDT
provides all the display functions for each 3300 ACM, all
3300 ACMs may be purchased and installed without display
modules. (NOTE: Field programming of 3300 ACMs without
display modules must be performed via communications
using a portable computer.)
To select which 3300 ACM is to be interrogated, the UNIT I.D.
number and BAUD RATE of the meter must be programmed
from the front panel of the 3300 RDT. No password is
required.
The 3300 RDT is capable of displaying information for one
3300 ACM at a time, communicating at any valid baud rate
between 300 and 19,200. The 3300 RDT is a master device;
therefore, only one 3300 RDT can be used per RS-485 loop.
The polling activities of the 3300 RDT can be disabled, to
allow other master devices to take control (for field program-
ming via communications, etc.) Similar to the 3300 ACM, the
3300 RDT on-board operating firmware can be upgraded
easily via the communications port. The 3300 RDT incorpo-
rates a 2-part case design identical to the 3300 ACM.
Courtesy of NationalSwitchgear.com
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