Brx serial out problem

[Evilbeard]

I think what he's asking is the ground point on the BRX tied to the earth ground (like the power input terminal), or are they separate points?

I think the key point is that the logic grounds (which the RS232 is usually referenced) at both ends need to be the same potential. With BRX, I'm pretty sure there is not a separate logic and earth ground, so those are the same. Since the device he is talking to is DC, the 0VDC of that end is likely floating with respect to earth. The answer may be as simple as tying the 0VDC at that end to the same ground that BRX is tied to.

Disclaimer: While I have an electrical engineering degree, in my nearly 30 year career I have never worked as an electrical engineer. And while I write software/firmware/gate array/logic for automation, I have never built an actual machine. Feel free ignore what I've said as the ravings of a lunatic.

No, that makes sense, but if the logic ground and the earth ground are the same point internally in the BRX, it could determine how it's grounded. I'd just go ahead and run wires to the GND terminals on the 232 to make sure they are the same.

[Garyhlucas]

BobO,
Funny how that works. I don’t have a degree and all I’ve done for 30 years is build automation machines!