rockdude wrote:
Thanks, I called SRM and the person didn't sound confident in his answer but said it would not work with an ANT+ only head unit because it would not work with their older ANT+ only SRM head units.
Like you, some months ago I had a conversation with a SRM guy, but he was a competent one at the headquarter in Germany, knowing all technical internals, and I could talk to him in German.
I wanted a track PM. He explained to me that SRM has turned to the ANT+ Power Only protocol (the ANT+ protocol every bike computer and every powermeter with the ANT+ logo on it should understand) with the PM9. SRM kipped their Crank Torque Frequency (CTF) protocol with the PM9. I than ordered an “old” PM7 for a good price, because I very much prefer the Crank Torque Frequency protocol.
The SRM head units up to the PC7 understood only the SRM CTF protocol. The PC8 since about 2016 knows every ANT+ power, speed and heart rate protocol.