User's Manual

16 Universal Metering Transponder for kV2c™ Meter User Guide
Functional Description of the UMT-C-KV
The table below summarizes TWACS system communication features supported
by the UMT-C-KV.
Serial Communications Using the Manufacturer's Serial Port
Communications between the UMT-C-KV Serial Port and the meter
Test/Programming Connector requires the use of Identification and Security
packets. In this mode of operation the transponder recognizes that its serial ports
are sharing the same serial communication line and will not transmit from both of
its serial ports at the same time.
Table 2.3 Supported TWACS system communication features
Response Modes - TWACS-10
Standard Inbound
Header, Data (3 to 13 bytes)
Error Correction
Header, Data, Hamming (4 to 14 bytes)
Fast Poll
Fixed Header Only (1 byte with all indicator bits:
Alarm, Diagnostics, Tamper, and Outage, fixed at 1)
Link-Level Acknowledge
Header (3 bytes)
No Response
No Inbound Response (0 bytes)
Response Modes - TWACS-20
Standard (Mode 0)
Header, Data (3 to 7 bytes)
Standard (Mode 1)
Header, Data (4 to 14 bytes)
Standard (Mode 2)
Header, Data (5 to 14 bytes)
Link-Level (Mode 4)
Header (3 bytes)
Fast Poll (Mode 6)
Fixed Header (1 byte)
No Response (Mode 7)
No Inbound Response (0 bytes)
Standard (Mode 8)
Header, Data (3 to 7 bytes)
Standard (Mode 9)
Header, Data (4 to 14 bytes)
Standard (Mode 10)
Header, Data (5 to 14 bytes)
Inbound Signaling
Channels
6 channels
Channel Sets
Channel sets 0-5 for SCE and channel set 6 for RCE
test equipment
Time Slots
256 time slots
Message Capacity
14 bytes
Burst Capacity
22 bytes
Maximum Outbound Message Length
31 bytes
62 bytes in TWACS-20 extended length mode