Electronics for operating turnouts and signals
IO module
This is the IO module, it is an 8 output expander combined with an 8 input multiplexor.
On the left is the original version which can be followed by another output expander, but no more inputs.
On the right is the "b" version which rearranges the terminals to reduce the number of insulated wires needed to
build the unit and adds "sense in" to allow the unit to be followed by more input expanders as well as output expanders.
Current firmware supports up to 24 inputs.
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