Re: Shielded Cable
Thankyou for the response. I need to follow this through the proper
channels internally to see whether it should be pursued.
The world of standards is an interesting one and, as I'm sure you
appreciate, it is how these standards are interpreted and promoted by
consulting engineers that ultimately effects the success or failure
of a standards adoption.
The case in point is typical. Consulting engineers in my region
are 'adding' references to the ANSI/TIA-EIA 862 standard to their
documents; down to the level of using structured cabling between
field level devices. The problem I face is trying to explain why we
cannot run BACnet MS/TP over unshielded cable. If I state that the
BACnet MS/TP standard does not support it, the short answer I get is
that they will exclude BACnet suppliers from the tender process and
limit it to LON based products (as FT-10 Lon can run over Cat5e)
Technically I am not in the field of evaluating or even understanding
all of the electrical phenomenon surrounding shielding etc, so trying
to present a case for it to be dropped from the BACnet standard for
MS/TP is probably beyond my ability.
Perhaps I need to look at the problem another way, and try to educate
the consultant as to the benefits of shielding.