did a quick search on Yahoo for (“Breakout Box” AND SMDR) and found the following links. I believe the second one actually has a place to order a breakout box. But they have some tech info and the RS232 interface info..
http://www.wti.com/tech/p3pbifac.htm
http://www.sandman.com/rs232.html
Not sure if this will help but if you Yahoo or Google for Breakout Boxes, you will find a ton of info.