Re: initialization
Posted: Fri Nov 03, 2017 6:23 am
I have decided to cause a delay in the powering of the circuits that are connected to my BOB which is totally unisolated but will be feeding the c83 board which has optoisolators and buffers in it. The C83 will also have its UC100 side power delayed as well. The BOB I have, as I mentioned previously, is basically a straight through connector DB25 to DB25 with some filtering and some pull-up resistors for the inputs as well as a 5VDC connection. I will parallel this 5 volts to the 5 volts on the C83 BOB side. I will provide a separate 5 volts to the BOBs UC100 side. Both of these supplies will be delayed by some length of time in order for the UC100 to connect and initialize with the PC. I think that happens when the PC is powered up and before log on. If so then I will only need to sense the USB power and delay a second or two before enabling the other two 5VDC sources. I can toy around with the delay to see what works. This configuration should eliminate any potential ground loops as well as preventing the circuitry from back powering the UC100.
We get spoiled when for the most part we plug something in and it works and works. This problem reminded me of how much I just expect things to function as I expect them too and how quick I was to jump on the MC being the problem when it really appears to be a timing of the power sources coming online.
I really appreciate all the suggestions and insights each of you provided to help resolve this problem.
We get spoiled when for the most part we plug something in and it works and works. This problem reminded me of how much I just expect things to function as I expect them too and how quick I was to jump on the MC being the problem when it really appears to be a timing of the power sources coming online.
I really appreciate all the suggestions and insights each of you provided to help resolve this problem.