First, the brake documentation had to be procured and spotted - a Magtrol HD 510 - 8NA. The brake provides a TTL output for speed detection and measuring bridge outputs for torque detection. A small half-bridge circuit with active freewheel provides the braking energy. Likewise, the excitation current is measured and monitored. The brake requires various voltages such as +/- 24V, +/- 12V and 5V. Among other things, these are provided by a buck converter TPS5410 and DC / DC power supplies IA24xx. Things such as reverse polarity protection of the patch cord or a fuse link can also be taken into account, as well as I2C port expansion and level conversion for connecting a RepRap 2004 display.