How to Connect Caterpillar ET Software to the ECM? -Open Caterpillar ET Software, it will automatically connect to ECM, Click “Stop Connect”. -Click on Menu: “Utilities – Preferences”. -If using Caterpillar Comm Adapter 3, and Mark on “Enable Dual Data Link Service”. -If using Heavy Duty Scanner Caterpillar Comm Adapter II, and setting “Ports” (example: COM4) as your COM port at Device Manager. -If using NEXIQ USB-Link, Choose “RP1210 Compliant Device”, also Click Advanced button to select a specific RP1210. #Driver Download: -NEXIQ USB-Link -Caterpillar Comm Adapter 3 – V2.0 -Caterpillar Comm Adapter 3 – V4.4 -Once connected to the ECM, will displays “ECM Summary” as below;