User's Manual

Universal Metering Transponder for kV2c™ Meter User Guide 13
Chapter 2 • Functional Description
Primary Functions
The UMT-C-KV has two primary functions:
• Communication - receive TWACS outbound commands and generate
TWACS inbound responses.
• Data retrieval - from customer-selected kV2c meter registers configured at
meter/transponder integration.
Each of these functions is described in the following sections and is graphically
represented in Figure 2.3.
Communication
The UMT-C-KV communication process is described in the following sections.
Meter Interface
The UMT-C-KV performs the interface function of connecting a kV2c electric
meter to TWACS. It interfaces with the meter’s communication port and to the
power line using TWACS communication technology.
The UMT-C-KV uses TWACS technology to communicate from the meter, to the
SCE, to the utility company over the power distribution lines. The
outbound/inbound synchronization techniques allow detection of one outbound
command at a time. When a command is detected, the UMT-C-KV either
completes two-way command processing and transmits the inbound response
before outbound detection resumes, or, the UMT-C-KV completes one-way
command processing before outbound detection resumes.
Serial Number Address
The serial number address is the unique, fixed address present in every
UMT-C-KV. It is assigned at the factory and can be written using the Serial
Communication Port. It is used to address one UMT-C-KV at a time. This address
must be used during the initialization of the UMT-C-KV to assign at least the first
two-way address. Subsequently, the serial number address is optionally used for
communication to a single UMT-C-KV. The serial number address is also used
when testing the module with RCE test equipment.
Two-Way Address
Up to eight (8) two-way addresses are assigned to the UMT-C-KV in order for the
TWACS operating software and the module to communicate with each other.
N OTE Some features and capabilities of the transponder may not be supported, or may
be only partially supported by some versions of master station software.