Quote:
Originally Posted by Tom Line
Conceptually, if you take a digital multimeter and check between the ground pins and discover no resistance, then they are shorted together on the PCB the same way the Driver Station is. However, each individual pin is limited to a certain current, and will fail if subjected to too much.
This is a question that should be asked on the formal Q&A.
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I was having problems with my DSC yesterday as I was connecting the ground (-) of Digital Inputs 3 and 4 together and routing the signal pins of these two inputs to limit switches as the DSC has internal 10K pull ups (to clarify, my configuration is 2 limit switches with a common ground taken from Dig in 3 & 4).
For some strange reason when the limit switch connected to Digital input 4 line was closed, my signal (RSL) light went off and the robot was disabled.
I disconnected both limit switches and with an ohmeter checked to make sure that I was not shorting the (+) pin and all check out fine for both switches...
I plugged the limit switch that was originally connected to Dig Input 4 into other Digital lines with the same results and then disonnected Dig Input 3 and it not longer exhibited this problem.
I plugged Dig Input 3 back in and the problem re-appeared so I swapped Dig Inputs 3 & 4 and the problem went away but I am not sure if my limit switches are working yet and need to play with the software a bit yet to find out...
Very peculiar and this puzzles me... I wonder if there is anthing else that I should check?