Multiplex system tester

Abstract

An apparatus for testing a data multiplex transmission system by providing simulated source and sink of data for the multiplex transmission system that is compatible with the multiplex system and complies with the protocol of the Input/Output modules of the multiplex system. A programmable read only memory is programmable by means of toggle and thumbwheel switches to selectively and variably control the protocol, the length, the rate, the destination and the content of the data message. A status display is connected to the programmable read only memory to indicate the current point of progression of its programmable sequence. An error detector is connected to the programmable read only memory for determining whether the memory has stalled at a point of progression and an error display is also connected to the programmable read only memory to indicate and identify the error when this stall condition has occurred. A random access memory is included in the apparatus for storing the data received by it and a display is provided for displaying the contents of the random access memory.

Dependencies are inferred from the claim text.