Aclara Power-Line Systems Inc. Y72572-1 사용자 설명서

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Chapter 2 • Functional Description

All serial port opcodes defined for the UMT-C-KV are accessible through the 

meter optical port.

Communications between the meter optical port and the UMT-C-KV 
Test/Programming Serial Port begins with the transponder receiving a specified 
hexadecimal Identification Packet (IP) from the meter optical port - EE 80 20 00 
00 01 20 20 75.  After receiving the IP from the meter optical port the UMT-C-KV 
transmits an acknowledgement back to the meter optical port, verifies the 
password, sends an acknowledgement to the meter, and asserts its Modem Busy 
line.  The transmission of the Identification Packet and Security Packet conforms 
to the ANSI C12.18 communication protocol.  After password acknowledgement, 
all communication between the meter optical port and the transponder uses the 
Gateway Serial Protocol, GATEWAY-SPEC, in ASCII at 9600 baud. 
Communication between the meter optical port and the transponder continues to 
follow the gateway protocol until 1.0 +/- 0.01 seconds have passed since the last 
communication.  After this period has passed, the Modem Busy line is de-asserted.  

A default password is supplied to the customer for optical port access to the 
transponder. The transponder contains a “Bad Password Counter”. After counting 
4 incorrect passwords, the transponder locks out Serial Communication between 
the meter optical port and the transponder Test/Programming Serial Port for 15 
minutes. At the same time, the transponder sets bit 0 of register #36,”Indicators 
Tamper”. Bit 0 of register #36 remains set until cleared by TNS. The “Bad 
Password Counter” is cleared if no incorrect password has been received by the 
transponder within the last 15 minutes. 

The UMT-C-KV reads a subset of 32 registers as selected by the utility company. 
All selected data are read at power-up and every five minutes thereafter if a valid 
RCE Time Synchronization command was received. See Time Synchronization on 
page 9.

Some features and capabilities of the transponder may not be supported, or may 

be only partially supported by some versions of master station software.

The UMT-C-KV provides remote access to the energy measurement registers of 
the kV2c meter. The UMT-C-KV retrieves appropriate values from the meter’s 
internal ANSI Standard tables. The UMT-C-KV retrieves data from only 
“programmed” kV2c registers. When requested, the UMT-C-KV can supply data 
from the latest read.