We are trying to use an incremental encoder with the 9411 board. The difference between the inputs A and Ā never goes negative. So, for example, the difference will vary between 3 and 18V. This is also true of B and Ḃ. The specification of the 6411 board suggests that to detect a negative going pulse, the difference has to go negative. Is this correct ? if it is, can anyone suggest a way to read this encoder, or failing that, any product that would convert the signals to something more easy to read?
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