Quote:
Originally Posted by arber333
Paul i am working on encoder mount now and will mount it the same way as resolver is mounted. Now since i have open collector A, B, Z signals i will have to pull them up to 5V with resistors. Can you suggest R value? I see you use 1K resistors to protect micro pins. Do i use 1K also, or could i use 4.7K. Or should i rather use 470R to make ports react faster? Or would you recommend changing input resistors from 1K to 470R?
RLS has 20mA draw limit for their encoder chip.
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4K7 is fine, in my opinion. The encoder does not need to react fast - it needs to react consistently. If the signal rises high enough to qualify as ON and falls low enough to qualify as OFF that's all that's required. It can look like a sine wave or a triangle even. But channel A needs to rises before channel B one direction, and channel B rises before channel A the other direction. My cables were made of unshielded category 5 solid-core 22 AWG wire, they were unshielded, I used a voltage divider on the signals since it was fed with 24V and the micro wanted a 5V signal, and there were contacts held together with duct tape. It worked fine for testing ... I would do it a bit better than that for the permanent install ... The scope showed is was very noisy, but it worked.