M-BUS

	Meter-BUS or short M-BUS which is designed mainly for remote reading of water meter, gas or electricity meters - not to be confused with Smart-BUS or short S-BUS is designed mainly for home automation

Physical layer

Master to slave: 36 Volt = 1 - 24 Volt = 0
Slave to Master: Draws < 1,5 mA = 1 - draws11-20 mA = 0
Baudrate: 300 - 9600
Cable: Two-wire standard telephone cable (JYStY N20.8 mm)
Max cable length: 350 Meter (Lower baud rates up to 1000 Meter - but restricted power not below 12 V max capacitance 180 nF)
Power: Up to 27 Watt through the cable = 0,75 A
Slaves: Up to 250 in a single segment
Repeater: Also called a master and typically is an M-BUS to RS232 converter attached to a host
Plug: No standard
M-BUS slave example: MIKROE-4137 M-BUS SLAVE CLICK
- Transceiver example: TI-TSS721A
M-BUS master example: MIKROE-3880 M-BUS MASTER CLICK
OMS-Group - Extension of M-BUS and wM-BUS