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
- M-BUS master example: MIKROE-3880 M-BUS MASTER CLICK
- OMS-Group - Extension of M-BUS and wM-BUS
- Newhaven display 2x20
- Onboard display controller Sitronix ST7036i
- See M-BUS physical layer]
Links
- M-BUS Documentation (Loads PDF)
- m-bus Linux
- https://m-bus.com/ (Good documentation)
- libmbus is an open source library for the M-bus (Meter-Bus) protocol
- libmbus on github (Newest??)
- Kamstrup M-Bus mater Multiport 250D (PDF)
- Kamstrup MUTICAL 603 Heat Meter