Jeffrey,
I have one of these but have not used it for a while. The two connections on my release are short (black) and long (chrome). If you press the release without connection to the camera, you will notice that the long (chrome) pin extends first, then the short (black) pin extends. I believe the first to extend should be connected to the camera body (long/chrome), this will flip the mirror, the other (short/black) connects to the lens to fire the shutter.
As a side issue. I find that sometimes when unscrewing the connector from the lens, the sleeve that extends out when connecting the release, does not return. I have had to pull (Push?) the connector whilst unscrewing it for correct removal. I don't know if this is a common problem?
Sorry for the long post, I hope its clear?
Barry