Ken - TRS is just another connector at the end... much like coaxial cable can terminate in an RCA, an F-connector or a BNC, balanced audio can end in an XLR or a TRS.
Anyone that has to go XLR to TRS, this is the Rane Corporations' standard:
XLR (OUT)
1 - no connection
2 - RED conductor to TIP
3 - BLACK conductor to RING
Drain wire of course attaches to SLEEVE of TRS
and going the other way all connections are the same except drain wire goes to PIN 1 of XLR and SLEEVE has no connection (ie: Rane says to "drain" to receiving electronics)
Bren R.
