ter, including
reliable access to interval data
for load proling and to meet
real-time metering requirements
for direct-access accounts.
All normal billing information,
such as total consumption and
peak demand, is immediately
accessible.
In addition to the S4 features,
the CMT provides pertinent
outage data stored in non-
volatile memory, to calculate
customer outage indices.
CMT-SX functionality is further
enhanced by the ability to
support system level monitoring
of feeder phase voltage proles.
Two-way power line
communication combines
unparalleled exibility to read
and reset the meter with
proven reliability to achieve an
economical, high-performance
wide-area utility communication
solution. The CMT-SX is available
in either a single-port design or
with the added functionality of
a multi-port design. The three
ports on the multi-port model
can be used to read up to three
meters (i.e., electricity, gas, and
water) through a single module.
The CMT for the Landis+Gyr
S4 meter is a TWACS
communication module
available factory-installed or
as a retrot kit. The CMT-SX
module acts as a protocol
converter between the native
language of the solid-state
meter and the TWACS network,
and can collect and transmit
any meter quantity data. The
data is returned in less than 20
seconds, and non-billing data
such as outage indices, phase
voltages, currents, power factor,
etc. can also be retrieved, to
support remote site diagnosis,
power quality and other
analysis.
The TWACS CMT for the S4 can
be used to collect interval billing
data from all meters to yield
an accurate and indisputable
settlement process, as well
as for supporting aggregation,
combined billing and other tools
of the commercial marketplace.
15-, 30-, and 60-minute interval
data can be retrieved from the
CMT-SX in blocks several times
a day, eliminating the need for
separate recording instruments
and associated costs.
Outage Indices
The CMT-SX module has
powerful built-in registers
that enable timely, accurate
calculation of customer Power
Distribution Reliability Indices.
Outage Assessment and
Restoration
Supports identication, veries
and assesses outages and
sends timely notication with
TWACS OASys, resulting
in more accurate and timely
dispatch of crews and real
time monitoring of restoration
progress.
Voltage Monitoring
The CMT-SX can monitor feeder
voltage and support system
level proles by retrieving phase
voltage measurements from
the meter, enabling automatic
monitoring and eld
diagnostic capabilities from the
ofce.
w w w . t w a c s . c o m
Commercial Metering Transponder
For The Landis+Gyr S4 Meter
Commercial Metering Transponder
inserted in the Landis+Gyr S4
Meter
CMT-SX Commercial Metering Transponder
For the Landis+Gyr S4
Energy, On-Request and
Aggregated Reads
The CMT module provides
remote access to the accurate
energy registers of the S4
meter. Since the CMT-SX is
always connected to the main
ofce, all billing data and any
selected meter register can
be read live usually within
20 seconds. Aggregated reads
and billing are enabled through
system time synchronization
and integration of multiple
meter inputs into a single
customer/account identier.
Time-of-Use Tariff Billing
The CMT-SX accumulates
consumption in up to ve
TOU tiers based on time of
usage. TWACS technology is
used to synchronize all system
meter clocks, provide remote
access to the TOU tier data
and make adjustments to the
TOU schedule. Data can also
include peak demand values
calculated separately within
each TOU period.
ADDITIONAL FEATURES
Demand Billing with
Remote Reset
For demand-billed accounts,
both real and/or reactive
demand values and times of
occurrence can be remotely
read. The CMT-S4 can acquire
a demand reading without
reset which eliminates monthly
resealing of the demand-reset
lever, multiple inadvertent
resets, and tampering through
unauthorized resets.
Flexible Read Dates
The CMT-S4 supports the
rescheduling of read dates
to reect cycle changes or
to meet customer needs to
be read on a specic date or
schedule - - without the need
to visit the meter.
Tamper Detection
The CMT-S4 expands ve
levels of password security
in the S4 to include remote
monitoring of reverse power
ow, no consumption in 24
hours, and self-diagnostics.
Since the TWACS CMT is in
communication with the main
ofce throughout the day,
interval data can be used to
determine changes in usage,
an early indicator of tampering.
INSTALLATION FEATURES

Self Contained 480V 3-Wire
Delta Availability
The CMT-S4 combination
enables simple self-contained
480V 3-wire delta installations
without the need for expensive
potential transformers and
associated wiring.
Wide Selection of Meter
Forms
The CMT, in conjunction with
the S4 meter, are available in
the widest selection of meter
forms yet, 208, 240, 277, 480
VAC commercial applications.
Optional Input/Output
Board
A DCSI option board is
available to supply three KYZ
outputs and receive inputs
from one additional meter.
STANDARD TWACS
FEATURES
Under the Glass AMR
No batteries required in the
CMT module
System-wide time
synchronization
Non-Volatile billing data
registers
Retrieved data stored in an
Oracle relational database
Distribution Control Systems, Inc. | An ESCO Technologies Company | An ISO 9001:2000 Company
945 Hornet Drive, Hazelwood, MO 63042 | (314)895-6400 | FAX: (314)895-6543 | sales@twacs.com | www.twacs.com
DCSI Options Board