Owner`s manual

page 10
CARD EDGE CONNECTOR CONTACT ASSIGNMENTS
1. Chassis Ground
2. Output +
3. NC
4. Output -
5. Audio Ground
6. NC
7. Ring of the 1/4" TRS connector labeled "OMNIPORT" on Radial Workhorse or "OPT IN" on Purple Sweet Ten Rack
8. Input -
9. Tip of the 1/4" TRS connector labeled "OMNIPORT" on Radial Workhorse or "OPT IN" on Purple Sweet Ten Rack
10. Input +
11. Radial Workhorse BUSS FEED
12. +16VDC IN
13. Power Ground
14. -16VDC IN
15. NC