I/O module for a serial multiplex data system with a programmable communication module selector

DETAILED DESCRIPTION It is therefore the principal object of the present invention to provide a data link module for use in a time division multiplexing control system which overcomes the various disadvantages of the known data link module.
This object is achieved in part by provision of a data link module with means for producing output control signals in response to input signals received on a data bus input terminal on a time division basis during an associated one of a plurality of time division multiplexing time slots, the improvement being an input signal conditioner with means for initiating generation of an intermediate data pulse in response to the signals at the data bus input terminal exceeding a pulse initiation threshold voltage, means for terminating generation of the intermediate data pulse in response to the signals at the data bus input decreasing beneath a pulse termination threshold voltage different from the pulse initiation threshold voltage, an intermediate pulse continuity checker for determining whether the intermediate data pulse is extant at each of a plurality of occurrences of the address time slot associated with the data link module and means responsive to the pulse continuity checker for producing a conditioned input signal only when it is determined that the intermediate data pulse is extant during each of said plurality of address time slots.
The object is also achieved by providing a data link module powered by a DC supply voltage with means for producing an output control signal in response to data received on a data bus on a time division multiplexing basis for use in a time division multiplexing control system having a master clock for producing a master clock signal, the improvement being a power on reset delay having means for detecting the application of DC supply voltage to the data link module and means for inhibiting the control signal producing means from changing the output control signal in response to data prior to the continuous application of the DC supply voltage for a preselected time period