We're out and the manufacturer (Smarthome) has now declared this controller as "Discontinued." It has had a long and useful life span of 6 years - - - RIP. You might want to consider the newer PowerLinc Modem 2413U. It is USB based and can handle BOTH X10 and INSTEON protocols and, of course, is supported by Indigo
The PowerLinc Controller interface connects directly into one of your Mac’s USB ports (preferably one on the Mac itself). It then plugs into the nearest standard AC outlet – not into a power strip or UPS, please. There is even a pass through outlet on the front of the PowerLinc Controller so you won’t lose that wall outlet you just used. You’re now ready to communicate with all your X-10 devices (Lamplincs, SwitchLincs, ApplicanceLincs, etc.) that are plugged into your house wiring. Now just launch Indigo, the premier home automation software for the Mac. It will find the PowerLinc Controller and you are ready to define devices and issue commands and utilize the full functionality of Indigo including loading of commands into the PowerLinc Controller itself if you choose to shut down Indigo or even your computer itself.
The slower Serial Port is no longer even available on newer Macs so USB is definitely the way to go. The PowerLinc Controller transfers data at higher speeds and only occupies one of several USB ports you may have on your Mac, allowing you to easily add other USB devices.
The PowerLinc Controller has 32KB of on-board memory that won't be erased if the power fails. An on-board clock keeps accurate time with integrated 10-year battery back-up. The PowerLinc Controller when coupled with the Indigo home automation software allows you to upload a large subset of Indigo timer and event commands to the memory of the PowerLinc Controller thus giving you the option of turning off your computer and letting the PowerLinc Controller do what its namesake says: "Control."
As an added service from MacHomeStore.com, we “pre-test” each and every PowerLinc Controller before we ship it out the door to you. We do this under Indigo installed on our Macs here. We do this because we recognize that this device is the crucial link between your home automation software (probably Indigo) and all those neat X-10 devices you have installed. Just a little added assurance because we want satisfaction from you, not frustration.
Compare the Controllers . . .
Here's a comparison matrix that shows the relationships/functionality that Indigo has with the various powerline interface controllers:
Indigo/Interface Feature Comparison Matrix