What cable do I need to connect my Heidolph overhead stirrer to a Data Hub and software system? Your overhead stirrer motor needs to have an RS232 port (interface). You will need an RS232 cable to connect it to an RS232 port on the Data Hub. There are different types of RS232 cables. It is vital you use the right one for your specific device. For Heidolph RZR stirrers with RS232 interface, the correct RS232 cable is: 14-007-045-17: Interface Cable RS232 For older Heidolph Hei-TORQUE Ultimate (Hei-TORQUE Precision) stirrers with RS232 interface, the correct RS232 cable is: 14-007-040-66: Interface Cable RS232 (3m) For current Heidolph Hei-TORQUE Ultimate (Hei-TORQUE Precision) stirrers, the correct RS232 cable is: 14-007-040-72: RS232 Interface Cable – 9pin to 9pin