Connecting RS485 enabled device to RS422 enabled device.

My church recently purchased a Hsility PTZ controller and a PTZ camera.
My problem is that the PTZ camera is connected via USB and doesn't have an IP address.
I was told by the camera seller through Amazon that the the problem would be solved by connecting them via RS485.
The controller does not have a RS485 port, but does have a RS422 receptacle.
What would I have to buy in order to connect these two pieces of equipment?
The RS-485 and RS-422 standards are electrically similar, and it may even be possible to directly connect the RS-422 and RS-485 devices together for communications (otherwise you could use a RS-485 to RS-422 converter; here is one example . However, this is only one small part of the problem. There must also be a digital communications protocol that runs on top of the RS-485/422 connection that both devices support.

As an analogy, think of RS-485 and RS-422 as telephones, one a land line and another a cell phone. Both allow two people to talk to each other, and each of them could even be using a different type of telephone. The protocol in this analogy is the language that each person speaks. If both people speak English, then they can successfully have a conversation. However, if one person speaks only English and the other speaks only French, they will not be able to communicate with one another.

Therefore, you first need to find out what communication protocol(s), if any, are supported by both the controller and the camera.
There is eternal confusion on the part of some suppliers with regard to RS-422 and RS-485. Some assume that anything with 2 wires is RS-485 and with 4 wires RS-422. This is plain wrong. So I'd advise to connect it, just see if it works.