This is accomplished by using RC5, Pin 24, as a transmit enable line connected to U7’s driver enable (DE) input.
When the C/MRI application software, resident in the PC, requests that a given SMINI node send the railroad data to be received as inputs on its 3 input ports, the U1 gathers the data, converts it to serial format, then activates U7’s DE enable line, which then seizes the serial bus for sending the input data to the PC.
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