The supplied six-foot, 9 pin serial cable connects the unit to a serial port on your computer. If your computer does not have a 9 pin serial port, a USB to 9 pin serial adapter cable will be required. These USB to serial adapters cables are available at any computer or Radio Shack store. Additional Caller ID interface units are connected to one another using the supplied 9 pin cable Please refer to page 3 for more information on connecting multiple units.

Phone lines are connected to the back of the unit using modular jacks. Input and output ports are provided for wiring systems using 2 wire RJ11 connections. If the wiring coming into your building does not terminate in modular jacks, contact your telephone vendor to add these modular connections.