https://rs-485.com/index.php?action=history&feed=atom&title=Multidrop_bus 2026-05-04T16:24:08Z Revision history for this page on the wiki MediaWiki 1.42.3 https://rs-485.com/index.php?title=Multidrop_bus&diff=686&oldid=prev 2026-05-02T19:40:23Z

<p>Imported from Wikipedia (overwrite)</p> <p><b>New page</b></p><div>{{Short description|Type of computer bus}}<br /> A &#039;&#039;&#039;multidrop bus&#039;&#039;&#039; (&#039;&#039;&#039;MDB&#039;&#039;&#039;) is a [[computer bus]] able to connect three or more devices. A process of [[Arbiter_(electronics)|arbitration]] determines which device sends information at any point. The other devices listen for the data they are intended to receive.<br /> <br /> Multidrop buses have the advantage of simplicity and extensibility, but their differing electrical characteristics make them relatively unsuitable for high frequency or high bandwidth applications.<br /> <br /> ==In computing==<br /> Since 2000,{{citation-needed|date=October 2018}} multidrop standards such as [[Peripheral Component Interconnect|PCI]] and [[Parallel ATA]] are increasingly being replaced by [[Network topology#Point-to-point|point-to-point]] systems such as [[PCI Express]] and [[SATA]]. Modern [[SDRAM]] chips exemplify the problem of [[Signal reflection|electrical impedance discontinuity]].{{clarify|date=December 2013}} [[Fully Buffered DIMM]] is an alternative approach to connecting multiple [[DRAM]] modules to a memory controller.<br /> <br /> ==In automotive==<br /> One of the first widespread multidrop serial buses available is [[CAN bus]] designed by engineers at [[BOSCH]] starting in 1983, released in 1986. CANbus is widely considered to be replaced by [[Ethernet_over_twisted_pair#Single-pair|SPE]] in the near future.&lt;ref&gt;https://www.keysight.com/blogs/en/tech/2024/02/8/how-is-10base-t1s-different-from-can&lt;/ref&gt;<br /> <br /> Starting in 2019, the [[Institute_of_Electrical_and_Electronics_Engineers|IEEE]] defined multiple multidrop-bus ethernet standards, namely in 802.3cg and 802.3da, called 10BASE-T1S, and 10BASE-T1M respectively, the latter being an improvement in terms of noise resistance, power delivery and collision avoidance. <br /> Both 10BASE-T1S and 10BASE-T1M directly compete with [[CAN_bus#CAN_XL|Can XL]].<br /> <br /> ==For vending machines==<br /> ===MDB/ICP===<br /> {{main|Multi-Drop Bus / Internal Communication Protocol}}<br /> MDB/ICP (formerly known as MDB) is a multidrop bus computer networking protocol used within the vending machine industry, currently published by the American [[National Automatic Merchandising Association]].<br /> <br /> ===ccTalk===<br /> {{main|ccTalk}}<br /> <br /> The ccTalk multidrop bus protocol uses an {{nowrap|8 bit}} [[Transistor–transistor logic|TTL-level]] [[Asynchronous serial communication|asynchronous serial protocol]]. It uses address randomization to allow multiple similar devices on the bus (after randomisation the devices can be distinguished by their serial number). ccTalk was developed by CoinControls, but is used by multiple vendors.<br /> <br /> ==See also==<br /> * [[Network topology#Bus|Bus network topology]]<br /> * [[RS-485|EIA-485]]<br /> * [[1-Wire]]<br /> * [[Open collector]]<br /> * [[I2C]]<br /> <br /> ==References==<br /> {{reflist}}<br /> <br /> ==External links==<br /> *[http://www.research.ibm.com/journal/rd/494/benner.html IBM Journal of Research and Development]<br /> <br /> {{Computer-bus}}<br /> <br /> {{DEFAULTSORT:Multidrop Bus}}<br /> [[Category:Computer buses]]</div>

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