What cable do I need to connect my Radleys Carousel Stirring Hotplate to a Data Hub and AVA? Your hotplate needs to have an RS232 port (interface) – so it must be the Carousel Connect model. There are different types of RS232 cables. It is vital you use the right one for your specific device. For the Radleys Carousel Connect Stirring Hotplate, the correct RS232 cable is: RR91237: Carousel Connect RS232 Interface Cable – 9 Pin to 9 Pin N.B. This is a different RS232 cable to the now discontinued Carousel Advanced model. The Carousel Advanced RS232 cable is still available as a spare part. RR91234: Carousel Advanced RS232 Interface Cable – 15 Pin to 9 Pin