Extend the power and scope of your home control system using the most reliable, economic and easy to install dedicated transmission line available! This 8-port expansion hub uses the RS-485 protocol, which is not only more powerful than the RS-232 protocol, but is also easier and more affordable to install. Because RS-485 signals travel farther along the line, you can run dedicated cable without having to purchase expensive repeaters, couplers, amplifiers. You'll also save big bucks by reducing the amount of wiring used, since devices connected to the RS-485 line can be daisy chained, instead of home run. The hub is designed to be wired between any RS-232/485 or PC-compatible home control system (like the Stargate, TimeCommander Plus, etc.) and the peripheral devices it controls (i.e. LCD keypads, thermostats, display panels, etc.). And because the hub has its own dedicated 12V power supply, it can easily transmit signals and power to the peripheral devices. For example, if your home control system supplies 100 milliamps, and you want to run three 50-milliamp devices, you'll have to augment your system with additional amplifiers and/or repeaters. With the RS-485 Expansion Hub, you can power up to 8 peripherals directly, without additional equipment! Each channel has a separate RS-485 driver, which can transmit signals along 4,000 ft. of cable on each channel. Other features include 2-wire half-duplex operation, 4-wire screw terminal strips (2 power, 2 data) and 16-device configuration. Select either an RS-485 (#3004 manufacturer part#001-00624 8AH485 ) or RS-232 (#3004232 manufacturer part#001-00634 8AH232 ) connected version. Dimensions are 6" x 4" x 1.5". A 12V, 1000ma power supply is included.