So I have a midi floorboard that can handle two way communication using a 7-pin cable, but the Kemper does not support this. Also, while you could normally power the floorboard using phantom power, this is also not supported by the Kemper.
Needless to say, this made setup and tear down time incredibly tedious, with a lot of cables running all over the place.
I did a little searching on ebay and came across this interesting doohickey.
[Blocked Image: http://i1363.photobucket.com/albums/r704/jimmyrage/Midi%20Connector_zpssnkzzuno.jpg]
It has two 5 pin midi female jacks for in and out on one end and one seven pin female jack on the other. It also has a small DC power jack to connect a power supply to.
Tried it out with the Kemper and it works like a charm, not I only need one cable running from my rack to my floorboard for both power as well as two-way communication. The power supply is hooked up within the rack, so I don't need to worry about connecting and disconnecting anything, just hook up the 7 pin cable to the floorboard and I am good to go.
While this product was specifically designed for the Gordius Little Giant series of foot controllers, I don't see why it wouldn't work for something like a Liquid Foot or RJM Mastermind that can also do two-way communication and use phantom power.
ebay seller is midikabel and they are quite friendly and the product works. Very happy with this solution. Even Xavier from Uno4Kemper/Gordius told me that he would look to them in future for customised midi cables.