You will need is an AS-EC-XXE cable in the appropriate length (the “XX” gets replaced with the cable length in the part name: AS-EC-2E is a 2-foot cable, AS-EC-15E is a 25-foot cable).
You will need to check the software versions on both units too as some software versions will not communicate. If both are the same than no problems but if they are different there could be a problem and you will have to upgrade at least one of them to get them to communicate.