36Step 1. Open the KPC-3 Plus caseStep 2. Confirm that a battery connector (pig tail, snap connector) has been installedor install one, as described above, if needed. If there is a protective clip overthe battery connector, remove itStep 3. Attach a 9-V batteryStep 4. Close the caseStep 5. Press the power switch on the front panel of the KPC-3 Plus to turn yourKPC-3 Plus ON, confirm that the power indicator next to the power switchgoes on, and then press the power switch again to turn the power OFFIf the power indicator (LED) does not go on as expected, the unit may be defective, soyou should check with your dealer.This concludes the installation of power to your KPC-3 Plus. The next topic isconnecting your KPC-3 Plus to your computer.Connect your KPC-3 Plus to Your ComputerYour KPC-3 Plus and your computer communicate with each other via a serialcommunication cable connecting the KPC-3 Plus‘ ―Computer‖ port and a serial (COM)port on your computer. This connection is shown in the diagram on page 33.Your Serial Communication CableThe serial cable needed to connect your KPC-3 Plus to your computer (a standard off-the-shelf, RS232 modem cable) is not supplied with the KPC-3 Plus. You will need topurchase one, or construct one.Note: You may construct your own cable, using wiring instructions given below.The two options, purchasing your cable or making it, are covered next.Purchase Your Serial CableTo purchase your cable (from your local amateur radio dealer or computer dealer):specify that you need a standard serial modem cable (RS232), with high qualityshielding (see Note 2 in the Radio Frequency Interference Statement section),less than 3-m in length, and at least 9 wires connected,specify that one connector be a male DSUB-25 connector (to connect to yourKPC-3 Plus‘ female ―Computer‖ port) and the other connector be a femaleDSUB-9 or DSUB-25 connector (depending upon whether your computer‘s serial(COM) port has a male DSUB-9 or DSUB-25 connector)