I just bought VS pump the Intelliflo 2 vst, to match up in my system. Everything I read says it can talk to Solartouch with communications cable (included with pump). Seems not quite true, my Solartouch is only 10 months old, but apparently the 2VST is running different software than the Intelliflo series of pumps, and as such requires a software/firmware upgrade.
Evidently v2.2 fixes the issues, and my controller is only v2. Took several hours and several calls to Pentair support by installer to confirm issue.
High 5 to Pentair for owning up to the issue, and promising to send out a tech in the next day or two to 'flash' my solartouch controller.
Will update with final results.