Hardware design questions

[jpk__]

Originally Posted by nic123

Yes Jason, the PRO does have proper biasing. The DMX USB Pro has bias + source termination, the RDM USB Pro has none as it would over bias the line if it did.
Good to see you posting under your true name/company affiliation

Nicolas Moreau
www.enttec.com

Hi Nicolas,
I took another look at the DMX USB Pro I have here and don't see anything like the source termination specified in [2.5 Command port reference circuit]. Maybe I'm missing something obvious here which you could enlighten me about.

If the Enttec RDM USB Pro has no termination then how does it comply when used as a command port? Or is this device purely an RDM sniffer only?

Fixed my signature btw.