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We changed the non-modular mix racks to put the dip switches inside the Port B slot, on the right. This was because the iDR-16 PSU board mounts vertically behind the Main Board, blocking any access to rear-facing dip switches. There may have been a changeover period where a rear panel with the black plug was used together with a newer Main Board, which had the revised dip switch location.

If you look inside your Port B slot, you should see a set of 4 dip switches on the right hand side. These function in the same way as before.

Hope this helps.

– Jeff, A&H