Description of The FLAG ProtocolFLAG (a subset of the international standard IEC1107) defines the lowest level interface to a piece of electronic equipment. It used asynchronous "RS-232", half-duplex, and the device nominates the baud rate. Many types of physical connection are possible. These include RS-232, and RS-434 signal levels, current loop, open collector. A modem-friendly version exists for PSTN, GSM, and proprietary packet data services (eg Vodaphone Data "Paknet"). A multi-drop addressing system is used allowing a number of FLAG devices to exist on one communications bus.
For a copy of the FLAG protocol for meter manufacturers, please email firstname.lastname@example.org
Diagram of FLAG Relationships
Description of FLAG Relationships