Could someone explain attached m-bus bjt circuit in details? Is this a repeater of some sort?
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This is an RS232 to M-Bus Converter/Repeater. M-Bus format is used in Europe for automated meter reading. Basically it converts an RS232 signal into a 2-wire +-15v signal.
Here is a similar schematic with some additional explanation: https://code.google.com/p/iotsys/wiki/MBusConnector