Co je to MBUS

[Jindřich Franc]

PaPouch wrote:
> 
> M-BUS je prumyslova sbernice , max 100m, max 250 zarizeni. Prenos je dost
> podivny, jednim smerem se signal prenasi jako napeti a druhym smerem jako
> proud. je na to obvod od Texase - TSS721. M-BUS ma definovan i vlastni
> protokol.
> 
> Pokud ovsem nejde o Measurement Bus, to je logicky protokol na fyzicke
> vrstve RS485.
> 
> S pozdravem
> ing. Pavel Poucha
> 
> Navstivte prosim nase stranky: www.pap-el.cz
> 
> ----- P?vodn? zpr?va -----
> Od: <rkanovsky@csas.cz>
> Komu: Multiple recipients of list <hw-news@list.gin.cz>
> Odesl?no: 28. ledna 2000 8:34
> P?edm?t: Co je to MBUS
> 
> > Na internetu jsem hledal nejake informace o me male nokii 3210 a narazil
> > jsem na
> > pojem MBUS. Co to vlastne je a k cemu to slouzii ?. Byl tam popsan i
> nejaky
> > interface pro pripojeni k PC (MAX232, dva tranzistory, stabilizator
> napeti).
> >
> > Dik
> >
> > Roman K.
> >
> >

P?r informac? k M-BUSu

Prof.Dr.H.Ziegler:									Nov.1, 1996

30 reasons why to use an M-Bus interface

I)	Technical reasons

	1.)	Simple two wire bus interface for slave devices
	2.)	Integrated remote powering of all slave interfaces
	3.)	Optional integrated remote powering of slave devices (3.3V, 0.6mA each)
	4.)	Slave device powering optionally from bus, battery or external/mains
	5.)	Up to 250 slave devices per segment
	6.)	Interchangable polarity
	7.)	Arbitrary bus topologie (star, tree, net)
	8.)	Maximum segment size: 1000m (f?r <=9600 Baud)
	9.)	Maximum distance for 250 devices with standard telephone wiring: 350m 
	10.)	Maximum distance for 1 device: 10km
	11.)	Larger nets/systems possible via transparent repeaters
	12.)	Transmission baudrates: 300-38 400 Baud (includes mixed baudrate operation)
	13.)	Isolation by isolated construction or via optocouplers
	14.)	Optional reversible mains protection
	15.)	Short circuit proof
16.)	Bus will not block for arbitrary single defect in a slave interface or device
17.)	Single chip solution for slave interfacing available
	18.)	Automatic segment supervision and diagnosis
	19.)	Safe data transmission via current sink technique
	20.)	Can meet all EMC, ESD and EMI requirements
	21.)	Tap proof because of data transmission via current modulation

II)	Strategic reasons

	1.)	Very low incremental cost per slave (Components <2 euro)
	2.)	European standardisation (prEN1434, part 3)
	3.)	M-Bus-User-Group for coordination of application and development
	4.)	High acceptance (>700k p.a), especially in metering
	5.)	System components (level converter, repeater, software) available
	6.)	Increasing usage for sensors, actors, etc.
	7.)	Physical layer (interface) independent of software protocols used
	8.)	Any protocol with >=1 idle bit within 11 bits (e.g. stop bit of UART) usable
	9.)	Works well with established world wide standard FT1.2 of IEC870-5.


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Jind?ich Franc                    mailto:franc@elsaco.cz
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