Since the cost effectiveness of placing an IOC near every point where an interface to the control system is required may be prohibitive, I/O subnets implemented via message passing network protocols are utilized. The Advanced Photon Source (APS) control system is based on a distributed topology of microprocessor-based Input/Output Controllers (IOCs). The BUG not only provides this through the wired ''twisted pair'' standard of BITBUS, but extends the ability to fiber optic communications for signal transfer over extreme distances and through electrically ''noisy'' environmentsĪn I/O subnet for the APS control system - The BITBUS Universal Gateway By using this method of signal transfer, along with the communication conversion ability of the BUG, one could accomplish such things as the ability to run IEEE-488 instruments over great distances, extend a multidrop links to RS232 instruments, and provide a convenient interface point for remote analog and binary 1/0 signals, all on one homogeneous network. BITBUS is a multidrop, multinode link with the ability to communicate over great distances.
Among them, IEEE-488, RS232, and raw analog and binary signal 1/0. Each BUG node, utilizing ''on board'' intelligence, has the ability to provide a communication link between BITBUS protocol and other computer-signal interfaces. The BITBUS Universal Gateway (BUG) provides a unique, cost effective solution to many different computer interface problems.
International Nuclear Information System (INIS)
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