Bob is right about the older software that you may or may not be running in your 1198 unit.
You will actually need two cables to connect them to each other. One will be the AS-EC-QDE adapter cable to go from the 859 unit to one of the AS-EC-XXE Ethernet Connection cables. The “XX” in the last cable name should get replaced by the cable length as they come in 2, 10, 15, 20 and 30-foot lengths (Ex: a 15 foot cable would be an AS-EC-15E).