You can connect it and the AMS will use the same 6pin just like what comes off of your HUB or Buffer on the X1.
So you are saying I can use the buffer from a X1 which has a 6 pin input and a 4 pin output?
No the H2D has the buffers built-in to the printer directly. I’m saying your AMS is currently using the 6pin bus cable that connects from the buffer/hub on the X1 to the AMS; which the buffer/hub then connects to the printer via the 4pin cable.
The AMS, AMS HT, and AMS 2 Pro will all work directly on the H2D via their 6pin bus cables in series; without anything else other than external power for the AMS HT and for the AMS 2 Pro the external power is optional with the limitation that you can only use the drying function on one at a time with bus power.
Your current X1 is like this:
X1 Printer → 4Pin bus cable → Hub/Buffer → 6pin bus cable → AMS → 6pin bus cable → 2nd AMS → 6pin bus cable → 3rd AMS → 6pin bus cable → 4th AMS
Connecting it to the H2D will be like this:
H2D → 6pin bus cable → AMS → 6pin bus cable → 2nd AMS → 6pin bus cable → 3rd AMS → 6pin bus cable → 4th AMS → 6pin bus cable → AMS HT → 6pin bus cable → 2nd AMS HT → 6pin bus cable → 3rd AMS HT → 6pin bus cable → 4th AMS HT → 6pin bus cable → 5th AMS HT… etc up to 4 AMS/AMS 2 Pro + 8 AMS HT.
In your specific circumstance it seems you have the H2D with 1x AMS and 1x AMS 2 Pro. So you’d connect them like this
Connect from the H2D 6pin bus connection with a 6pin bus cable → connect the 6pin bus cable to one of the 6pin bus connections on the AMS 2 Pro → connect a 2nd 6pin bus cable to the 2nd 6pin bus connection on the AMS 2 Pro → connect the 2nd 6pin bus cable to the 6pin connection on your AMS.
All you’re saying is right but I’m afraid it will confuse # airsyspro
I have the same set-up, 1 H2D, 1 AMS2 PRO, 1 regular AMS.
AMS2 PRO is connected to the H2D via a 6-pin cable, The regular AMS is connected to the AMS2 Pro via a 6-pin cable, that’s it.
6-pin cable sold with AMS2 Pro or AMS are the same, just the length is different so you can play with those 2 cables as required depending on where you place each AMS. I put the AMS PRO on top of H2D so I used the shorter AMS cable to connect them and used the longer AMS2 Pro cable to connect the original AMS (placed on the side) of the printer to the AMS 2 PRO.
I don’t even use the optional power adapter. I can dry the filaments in AMS2 PRO while printing using the original AMS, no issue.
Crystal clear 
xxxxxxxxxxxxx
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Hi,
You listed that in great detail.
Could you do that again for the filament path (including adapters, etc.)?
I think the information on how to connect multiple AMS/AMS 2/AMS HT to the H2D or X1/P1 is very confusing.
A graphic overview of all connection scenarios (electrical and filament path) would be a real help.
Greetings
Robert
…at the same time… You can connect them but only one at a time can dry.
Sorry, I’m not making 144+ pictures 
good luck
Watch this clip:
The whole video is very informative so I recommend you watch the whole thing too.
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