M-BUS
From Teknologisk videncenter
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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
See M-BUS physical layer]
Links
- https://m-bus.com/ (Good documentation)