Hi everyone,
I’m currently evaluating the use of an ODrive S1 together with an M8325S motor for an existing motion system, and I have some questions regarding multi-turn absolute encoder support.
My setup uses a gearmotor driving a chain transmission with multiple sprockets. On the axis of one of these sprockets, I currently use an AS38-H39E-S13S multi-turn absolute encoder. This encoder uses an energy-harvesting mechanism, so it preserves the multi-turn position count even when external power is removed.
My idea is to use the integrated ODrive S1 encoder for motor commutation and the AS38-H39E-S13S as the load encoder.
From the documentation, I couldn’t find direct support for this particular encoder with SSI interface. Does anyone know if this type of encoder can work with the ODrive S1 as a load encoder, even if not officially supported?
There is also a BiSS-C version of the same encoder, which I could consider if BiSS-C support is better or already available.
The multi-turn functionality is essential for my application, since the system must retain absolute position information across power cycles.
Thanks!
Ooh, a Wiegand effect encoder, cool!
We don’t have support for this encoder verbatim at the moment. The Pro can support BiSS-C/SSI/RS485, the S1 can only support RS485. That being said, BiSS-C should be possible on the S1 with some external transceiver circuitry, but I haven’t tested this myself directly (happy to make some recommendations if you want to try!).
We already have multiturn encoder support over BiSS-C – that + Pro would likely be the quickest way to go. But just checking the datasheet, the RS485 protocol seems sane – if you’d need to get this working with an S1 without any external circuitry, I’d be happy to send over a test build of firmware with support for that encoder.
Thanks for the reply!
The RS485 version does not seem to be available anywhere, so that option is probably off the table for me. I’d also prefer to use a more off-the-shelf solution, so the Pro + BiSS-C approach you suggested sounds like the most practical path forward.
At the moment, though, the ODrive Pro appears to be sold out in the European shop, so I’ll probably have to wait a bit before I can test this setup.
I’ll reach out again once I get my hands on the hardware. Thanks again for the help.
Pro should be back in stock in 1-2 weeks! Alternatively you can order from the US shop.