Re: initialization
Posted: Wed Nov 01, 2017 10:57 am
Silor,
Now I see your problem. When one of the pins on UC100 gets power from the DB25 connector, it gives some power to the controller chip in UC100. Not enough to work, but enough to malfunction. When the USB is gets connected the UC100 will not start normally, as it is in an unknown state. (Once I had the same problem.) So UC100 have to get power from the USB first and only after this can any high input get to its inputs. Always connect USB first and only after this power up the other side.
Now I see your problem. When one of the pins on UC100 gets power from the DB25 connector, it gives some power to the controller chip in UC100. Not enough to work, but enough to malfunction. When the USB is gets connected the UC100 will not start normally, as it is in an unknown state. (Once I had the same problem.) So UC100 have to get power from the USB first and only after this can any high input get to its inputs. Always connect USB first and only after this power up the other side.