| 摘要 |
A stepper motor controller, for use with a main computer having vector interrupt capability, includes main address and data terminals, interrupt terminals, a select/enable terminal and control terminals, and is used to control the operation of a stepper motor pursuant to instructions from the main computer. The main computer enables a selected controller to accept commands or data through a decoder coupled to the select terminal. The controllers provide accept and error interrupt signals to the main computer when it is ready to receive data and to notify the main computer when an error condition is found. The controller generates a controller identifier message at its data terminals substantially simultaneously with the production of the interrupt signals to identify which controller is generating the interrupt signal. This eliminates the need for the main computer to poll the controllers.
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