PI (Physik Instrumente) LP has added four open- and closed-loop models in benchtop and OEM module versions to its E-616 multichannel controller line for piezo-based steering and stabilization mirror platforms. The closed-loop units have two servo controllers, sensor circuit channels and three integrated amplifiers that provide up to 10 W of peak power. The 25-pin sub-D piezo and sensor connector is on the front, with offset trim pots and LEDs for power and overflow. A 32-pin rear connector enables commanding and reading of the sensor and amplifier monitor outputs. Internal coordinate transformation simplifies control of parallel kinematics designs.