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This article describes a loop configuration in which a master controller and a slave controller are interconnected through the master controller loop. The slave controller controls its own loop.
English (United States)
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Controller-To-Controller Loop Inter-connect
This article describes a loop configuration in which a master controller and a
slave controller are interconnected through the master controller loop. The slave
controller controls its own loop.
Master controller 10 includes a primary loop adapter 12 to which a plurality of
terminals 14A through 14E are connected through a closed loop. Most of the
terminals 14A through 14E may be data input/output devices, such as point of
sale terminals or printers. However, one or more of the terminals may be a slave
controller, of which 14B is one example. The slave controller 14B is connected
to the master controller loop through a secondary loop adapter 16 and to its own
loop through a primary loop adapter 18. The terminals 20A through 20E, like the
terminals 14A through 14E, may be data input/output devices or perhaps
controllers for a tertiary loop of terminal devices.
The master and slave controllers operate independently of each other with
each controller performing its designated functions and providing support for its
connected loop. From the master controller's point of view, the slave controller
appears like any other terminal in its loop. However, the two controllers provide
a communications facility between an application program in the master
controller and an application program in the slave controller, permitting the slave
controller to consolidate system data before transmitting it to the master