In order for Caterpillar Electronic Technician to work with the Communication Adapter II, the settings must be changed to select the Communication Adapter II as the Communication Interface Device:
Steps: Step 1 Start Cat Electronic Technician. Step 2 Click the Stop Connect button when it appears. Step 3 Select the Utilities menu. Step 4 Choose Preferences > Modify.... Step 5 Click the Communications tab. Step 6 Change the Communication Interface Device to Caterpillar Comm Adapter II (Dual Data Link/Serial IP) and click OK. Step 7 Select the appropriate COM port (for example, COM1, COM2, etc). This application firmware only supports serial communications.