Lain402 J’utilise ces 2 hub sur mes 2 ASIAIR sans problème
I too also use that first hub that you showed. Branded differently (different logo), but quite obvious that it came from the same original manufacturer.
There are a couple of things to look for in powered hubs for the ASIAIR.
Most importantly, make sure that the hub does not backpower. This particular hub satisfies the criteria. As a hub for a Mac, this criteria is not important.
Next, look for one (like the one you showed) that has a 12V power input. Again, this hub satisfy that. Some hubs take 5 or 9V, or 19V (for Power Delivery), which is a pain, unless you have AC power at the telescope, or use a buck converter
Not only that, some hubs use the 5.5mm/2.5mm connector (for better current capacity), but this one uses the 5.5mm/2.1mm that astronomy hobbyists use. So, quite convenient, albeit, for safety, you need to be careful not to exceed the maximum total current that a 2.1mm connector can carry.
Next, find a hub that has ample current available to supply USB bus powered ports. The one above is capable of self powering USB devices up to 2.4A each (as long as the total usage does not exceed what the 12V supply can supply).
I have another 7 port hub that has one 2A capable USB port (they call it a charging port), but six ports that are only capable of 0.5A each, and that is not useful (especially the better 2A port goes through 2 levels of USB -- read on below).
The next one is often neglected, but important when you have lots of hubs -- in my case, I have one in my waterproof equipment box, where the ASIAIR is enclosed in 24/7, one on my dual saddle plate, one on my OTA's dovetail (so I can disconnect the OTA with just one USB cable and one power cable).
So here is the rub -- USB specs allows up to 128 devices, but more importantly only 7 levels or tiers (the addressing scheme runs out of bits at that point).
The Rasberry Pi 4 itself is tier one, and its USB hub has one extra tier (I haven't investigated to see if the third generation ASIAIR has even one extra tier -- it uses the Raspberry Pi CMM with ZWO's own I/O board that includes USB).
So, to use ASIAIR, you are eating up two of the seven tiers.
Now, onto 7 port hubs. You may wonder why the magic number seven! That is because these hubs are built with hub silicon chips that has one input USB port and 4 output USB ports :-).
From the USB input, the 4 port hub chip distributes to 3 USB ports with one USB level/tier. The remaining output from the chip then feeds a second 4-port chip. So, 3+4 = 7, the magic number.
However, that means that three of the port eats up one level while the other four eats up 2 levels of USB tier!
I don't have the data on hand for this particular hub (it is inside my equiment box, and I am too lazy to go outdoors to check what I have written on it), but if memory serves, the sequence is something like 1, 1, 2, 2, 2, 2, 1, or something weird like that. You can easily check the levels of your 7 port hubs by conectiing it to a desktop computer (USB Tree in macOS System Report, for example) to see how many levels for each port.
If you ever use the hub in an ASI camera, that is another hub.
And when you connect to a mount that has a USB hub, it can have at least one level too. I.e., if you have a couple of hubs, and try to connect a mount to the camera's USB hub, you may run out of levels!
Anyhow, if you suddenly find that ASIAIR does not see some device (especially a mount, that has one or more USB hubs), start checking if you have sufficient lebels. I actually ran into this one day when I temporarily added an extra hub to tap off a USB signal, and my EFW disappeared :-) :-). I was actually at the time testing the temperature mesurement of a 5V model of the EAF.
Anyway, if you take care of each of these items I listed above, there is no problem with using a powered hub with any Raspberry Pi, including the ASIAIR.
I suspect that the 4 port powered hub that you showed uses up just one level for all of its output. Unfortunately, Amazon USA does not carry that model, otherwise I would be interested since it gives 4 ports eating up just one USB level. EDIT: NewEgg carries it, but has no power supply specs. At $7, I will chance it :-) EDIT-2: looks like it has a 24W input power adapter, so I think I will pass, since it means that each port could be limited to 6 watts, or 5V at 1.2A.
For what its worth, not only do I use a 7 port hub that is shown in your first picture (the one with individual switches) with an ASIAIR, I am using the same design 16-port hub on my Mac Studio. Brand sold at Amazon USA is "ACASIS," by the way.
Chen