The Yaesu FT 891 Transceiver has the capability to connect to a computer and operate data modes. Yaesu sells a cable but it does not come set up for plug and play operation. For what it is, the cable also seems expensive.
The connector on the cable is the same type as the PS2 style keyboard or mouse. After a quick search on amazon, I found several cables. I ordered a 6 foot male to male so the cut off end could be kept as a spare. If you order a non Yaesu cable make sure all pins are connected in the cable.
For this project, I decided to install audio isolation transformers. These are 1:1 audio transformers and isolate the radio from the computer. These are relatively cheap and can be acquired from amazon or an electronics website.
Links
Yaesu FT-891 Review
Getting Started With WSJT-X and the Yaesu FT-891 Transceiver
Connecting TRX-Manager to the Yaesu FT-891
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KM4NMP 
Do you plug in your USB cable for CAT control and break isolation that way ?
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Yes, I use USB CAT control. I have not had any issues and assume the manufacture has some isolation designed in.
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Hi I have a Ft 891 and want to use a Signalink
With my raspberry pi with Wsjt-x (ft 8) will
It work?
ERNIE
KC2BD
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I have not tried using the Signalink with the FT-891. One of the reasons I choose the FT-891 is the ability to connect without extra equipment. I connect my Pi directly to the radio with a set of isolation transformers in between the radio and the Pi.
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I am buying an 891 this afternoon from a friend, and want to do phone, CW, and FT8
Do you know of a good interface that is available?
Also, I need a mic, as this radio does not have one with it.
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I was able to build all the interfaces needed using parts from Amazon. I was given an interface bought from eBay, it worked but failed within 6 months.
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