Abstract:  Aiming at the centralized meter reading system based on intelligent low-power direct reading water meter, a discrete component M-BUS adapter based on STC12C1052 microcontroller is designed to com:plete the data sending and receiving of the intelligent meter connected to M-BUS and upload the data to themonitoring computer through the concentrator, so as to realize remote meter reading. This paper introducesthe working principle of the M-BUS and the adaptor, and expounds in detail the M-BUS signal transceivercircuit, over current and short circuit protection, fault detection and fault signal transmission, remote wakeup and its application in remote meter reading. As the discrete components design is not limited by intellectual property rights, the circuit designed greatly increased the use of M-BUS receiving circuit.

Key words: M-BUS instrument bus: protocol adapter, greenization