Answer and Explanation:
I transitioned from semiconductors to software product management many years ago. It is much easier today as many hardware manufacturers are adopting many of the concepts and methodologies now mainstream within software development - namely, Agile and Lean. Where ever possible, ensure that you're adopting as many of these practices in your current industry as possible. Not only will this be better for your current product (IMHO), but it will enable you to build new muscles and demonstrate expertise in transferrable skills.
If you are early in your career, then the route Allan Hui promotes is a valid one. However, I would argue that we're living in an age of more doing than learning. Good product managers are extremely hard to find. If you're smart, a quick learner, and if you can demonstrate the core abilities to an experienced team that can appreciate your background, you can make the move relatively quickly.
A key book to read: Inspired, by Marty Cagan. This book is built upon the foundation of software product management.