[CA11] Can't setup ITC-5 from i70s.

[Nokay]

I installed a Seatalk NG back-bone and new i70s instruments on my boat as shown in the attached diagram. Things talk to each other as expected. I also added an AIS 700.

My problem:

I can't seem to setup the ITC-5. All transducers (Speed, Depth, Wind) are grayed out.

The sensors all seem to work reliably on the i70s. I get speed, depth and wind. The depth sensor also reports sea temperature.

I just can't get into advanced settings for the ITC-5.

In a different thread I saw a mention that I need to select the source for Speed on the i70s. This selection process seems flaky. Sometimes I get the response "Source Selection not Possible" and sometimes I get the single option to select "[Auto]".

Any idea what might be going on?