MS721 is a single chip transceiver developed for Meter-Bus standard (EN1434-3) applications.The MS721 interface circuit adjusts the different potentials between a slave system and the Meter- Bus master. The connection to the bus is polarity independent and supports full galvanic slave isolation with optocouplers.
The circuit is supplied by the master via the bus. Therefore, this circuit offers no additional load for the slave battery. A power-fail function is integrated. The receiver has dynamic level recognition, and the
transmitter has a programmable current sink. A 3.3-V voltage regulator, with power reserve for a delayed switch off at bus fault, is integrated.

It has following advantages:

1.Designed Specifically for Metering

2.Ultra-Low Power Consumption

3.Robust Bus Management Capabilities

4.Standardization and High Compatibility