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Mothinator · 03-19-2009, 11:52 PM

Hi Everyone,

I tried reseating the connections and still didn't work. I have the whole thing on a solderless breadboard and I want to get it to work there before I solder it up.

So a novice question: On the diagram for the ISO interface there appear to be two grounds. One from pin 1 and the other from pin 2 on the DB9.

It shows them as not being connected to one another. Is this correct? It seems to me that they should be connected because I don't see how the MC33290 could transmit to the arduino without it knowing the arduino ground level.

Thanks for your help!

03-19-2009, 11:52 PM	#334 (permalink)
Mothinator EcoModding Lurker Join Date: Mar 2009 Location: California Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts	Two Grounds? Hi Everyone, I tried reseating the connections and still didn't work. I have the whole thing on a solderless breadboard and I want to get it to work there before I solder it up. So a novice question: On the diagram for the ISO interface there appear to be two grounds. One from pin 1 and the other from pin 2 on the DB9. It shows them as not being connected to one another. Is this correct? It seems to me that they should be connected because I don't see how the MC33290 could transmit to the arduino without it knowing the arduino ground level. Thanks for your help!