ANSI C12.19 is the American National Standard for Utility Industry End Device Data Tables

This standard defines a table structure for utility application data to be passed between an end device and a computer. The "end device" is typically an electricity meter, and the "computer" is typically a hand-held device carried by a meter reader, or a meter communication module which is part of an Automatic Meter Reading system. C12.19 does not define end device design criteria nor specify the language or protocol used to transport that data. There are however related ANSI standards which do specify the transportation of these tables. ANSI C12.18 describes the communication of C12.19 tables over an optical port. ANSI C12.21

ANSI C12.21

ANSI C12.21 is the American National Standard for Protocol Specification for Telephone Modem Communication....

 describes the communication of C12.19 tables over a modem. ANSI C12.22

ANSI C12.22

ANSI C12.22 is the American National Standard for Protocol Specification for Interfacing to Data Communication NetworksC12.22 describes a protocol for transporting ANSI C12.19 table data over networks, for the purpose of interoperability among communications modules and meters...

 describes the communication of C12.19 tables over a network.

The purpose of the tables is to define structures for transporting data to and from end devices. A related standard, IEC 61968

IEC 61968

IEC 61968 is a series of standards under development that will define standards for information exchanges between electrical distribution systems. These standards are being developed by Working Group 14 of Technical Committee 57 of the IEC...

defines a CIM information model for energy data.

History

The structures were originally known as the "Tucker Tables" (after Richard Tucker.) The tables were developed under the auspices of the American National Standards Institute, C12, SC17, WG2. The standard is sponsored by NEMA, and also published as MC1219 and IEEE P1377.

Popularity of the tables has grown over the years such that all electric meter vendors in North America now support and use the tables in their products.

The committee (working group 2) is currently chaired by Avygdor Moise and released a revision of the standard in 2008.