System for and method of interfacing expansion modules with...

Details System for and method of interfacing expansion modules with... System for and method of interfacing expansion modules with...

2005-01-04

2005-01-04

Thai, Xuan M. (Department: 2111)

Electrical computers and digital data processing systems: input/

Intrasystem connection

Bus expansion or extension

C710S305000, C714S048000

Reexamination Certificate

active

06839785

ABSTRACT:
A communication interface involves a processor that communicates to expansion modules in order to read and write discrete input/output, analog input/output, intelligent module control, and expansion module status. The expansion modules can be application specific integrated circuits (ASIC), each having a state machine architecture that responds appropriately to the input/output expansion bus signals. The ASIC can include error detection using the first byte of messages from the controller. Thus, the ASIC detects when an erroneous message from the controller has been communicated and transmits a message to expansion modules that their output states not be changed in response to the message from the controller.

REFERENCES:
patent: 5596716 (1997-01-01), Byers et al.
patent: 6049894 (2000-04-01), Gates
patent: 6122747 (2000-09-01), Krening et al.
patent: 6654909 (2003-11-01), Quach et al.
patent: 6697903 (2004-02-01), Massie et al.

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