Data Communications Pocket Book by Michael H. Tooley

By Michael H. Tooley

A guide on facts communications masking neighborhood quarter networks (LANs), Ethernet, the structure of I/O units, parallel and serial facts conversion, good judgment circuits, fibre optic know-how and extra. geared up for swift reference, it really is aimed toward readers from the delicate to the non-technical

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Interface clear. Asserted by the controller in order to initialise the system in a known state. Service request. This signal is asserted by a device wishing to gain the attention of the controller. Note that this line employs wire-OR'd logic. Attention. Asserted by the controller when placing a command on to the bus. When the line is asserted this indicates that the information placed by the controller on the data lines is to be interpreted as a command. When it is not asserted, information placed on the data lines by the 46 IEEE-488 bus signals system is invariably a microcomputer and, whilst some manufacturers provide dedicated microprocessor based IEEE-488 controllers, this function is often provided by means of a PC or PC-compatible microcomputer.

Not ready for data. This signal is asserted by a listener to indicate that it is not yet ready to accept data. Not data accepted. This signal is asserted by a listener whilst data is being accepted. When several devices are simultaneously listening, each device releases this line at its own rate (the slowest device will be the last to release the line). Interface clear. Asserted by the controller in order to initialise the system in a known state. Service request. This signal is asserted by a device wishing to gain the attention of the controller.

D) Controllers Controllers are used to supervise the flow of data on the bus and provide processing facilities. The controller within an IEEE-488 46 IEEE-488 bus signals system is invariably a microcomputer and, whilst some manufacturers provide dedicated microprocessor based IEEE-488 controllers, this function is often provided by means of a PC or PC-compatible microcomputer. IEEE-488 bus signals The IEEE-488 bus uses eight multi-purpose bi-directional parallel data lines. These are used to transfer data, addresses, commands, and status bytes.

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