[GreenKeys] black box loop - 232 interface question

[gil smith]

Those boxes are only designed for low-voltage loops (up to about 30V 
IIRC)-- don't hook one to a 28 and high-volt loop supply.

I think they also had an option for an internal supply, but it was 
something like 18V at 20-mA -- fine for a 33, but maybe not what you need.

gil


At 05:26 PM 6/12/2008, you wrote:
>Did anyone come up with a schematic for those boxes that were on ebay?
>
>
>
>I got a couple of the boxes and they look good just need to figure out the
>details so I can connect it up to my model 28.
>
>
>
>Thanks,  Stan AK0B
>
>
>
>
>
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