The HMT25 multi-turn absolute encoder from BEI has an electronic reset capability. According to the company’s press release, the electronic reset can use system software for initialization. Sending a timed pulse through the reset pin, the encoder value gets set to 0 through a non-volatile internal memory. This encoder uses a geared multi-turn code wheel system rather than a battery dependant electronic turns counter, so its physical position is more precisely determined even in power down positions.