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Master–slave (technology)
In engineering, master–slave is a relationship between two systems in which one controls the other. In some cases one master controls just one slave system, but in others there are multiple slave systems controlled by the same master. Sometimes the master is a different kind of system than the slave, but sometimes there are multiple similar systems and one of them is designated the master in order to centralize external (i.e. user) control of the collection.
Due to its connection to slavery, the terminology is a subject of controversy and has been replaced with alternative terms in some cases.
In photography, secondary, or slave, flash units are connected to a master unit to provide synchronized lighting.
Parallel audio duplication often entails multiple recording with linkdevices (i.e. for cassette tape or compact disc) linked together so that operating the controls of a master device triggers the same commands on slave devices.
Railway locomotives operating in the same train (for example, to pull a load too heavy for a single locomotive) may be configured for master–slave operation with all but one of the locomotives controlled from the first. See Multiple-unit train control.
In a hydraulic system, a master cylinder is a control device that converts force into hydraulic pressure that drives movement in a slave cylinder at the other end of the hydraulic line. A common application is a vehicle brake system.
A master clock provides time signals used to synchronize one or more slave clocks as part of a clock network; a slave clock receives and displays the time from a master; though it may be able to keep time itself if the master is not working.
Computer bus protocols often use a master-slave relationship. For instance, a USB host manages access to the USB bus shared by any number of USB devices. A serial peripheral interface (SPI) bus typically has a single master controlling multiple slaves. I2C and I3C may even have multiple masters on a bus. Modbus also uses a master device to initiate connection requests to slave devices.
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Master–slave (technology)
In engineering, master–slave is a relationship between two systems in which one controls the other. In some cases one master controls just one slave system, but in others there are multiple slave systems controlled by the same master. Sometimes the master is a different kind of system than the slave, but sometimes there are multiple similar systems and one of them is designated the master in order to centralize external (i.e. user) control of the collection.
Due to its connection to slavery, the terminology is a subject of controversy and has been replaced with alternative terms in some cases.
In photography, secondary, or slave, flash units are connected to a master unit to provide synchronized lighting.
Parallel audio duplication often entails multiple recording with linkdevices (i.e. for cassette tape or compact disc) linked together so that operating the controls of a master device triggers the same commands on slave devices.
Railway locomotives operating in the same train (for example, to pull a load too heavy for a single locomotive) may be configured for master–slave operation with all but one of the locomotives controlled from the first. See Multiple-unit train control.
In a hydraulic system, a master cylinder is a control device that converts force into hydraulic pressure that drives movement in a slave cylinder at the other end of the hydraulic line. A common application is a vehicle brake system.
A master clock provides time signals used to synchronize one or more slave clocks as part of a clock network; a slave clock receives and displays the time from a master; though it may be able to keep time itself if the master is not working.
Computer bus protocols often use a master-slave relationship. For instance, a USB host manages access to the USB bus shared by any number of USB devices. A serial peripheral interface (SPI) bus typically has a single master controlling multiple slaves. I2C and I3C may even have multiple masters on a bus. Modbus also uses a master device to initiate connection requests to slave devices.