Yes, you can find interface sheets for most common devices on the website at the "service" tab of this website. If your device is not present you can ask us to support you. In most cases we can quickly provide you with a solution.
The HR option is the well known Polar* heart rate receiver. The receiver is integrated in the software of the controller. The test subject has to wear the heart rate belt around the chest. The receiver is placed in front of the test subject (or integrated in the controller in case of a Corival) and the HR data will be displayed on the controller of the ergometer