Busser - Valle´s Bedste Hjemmeside.
Busser - Valle´s Bedste Hjemmeside.
Busser - Valle´s Bedste Hjemmeside.
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<strong>Busser</strong><br />
Double TwistedPair RS 485<br />
Here, Master does not have to have tri-state output, since Slave devices transmit over the<br />
second twistedpair, which is intended for sending data from Slave to Master.<br />
Sometimes you can see a RS 485 system in a point-to-point system. It is virtually identical<br />
to RS 422; the high impedance state of the RS 485 output driver is not used. The only<br />
difference in hardware of the RS 485 and RS 422 circuits is the ability to set the output to<br />
high impedance state.<br />
http://www.pccompci.com/The_RS-_485_Serial_Port.html<br />
Forskellige IC-er beregnet til forskellige bussystemer:<br />
Nogle eksempler på kredse, der kan kobles til en uC og kommunikere vha. forskellige bussystemer.<br />
I2C, I 2 C eller IIC, eller 2-wire-bus.<br />
Bussen I2C har flere navne. IIC står for “Inter IC Communications” eller Inter Integrated<br />
Controller. Kaldes også nogle steder for 2-wire bus.<br />
I2C bussen er skabt af Philips I 80érne. Dengang var standarden en max clockfrekvens på 100 KHz,<br />
men nu findes en hurtigere standard på 400 KHz.<br />
/: Valle Thorø<br />
Side 9 af 43
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