Com.err. Acc. — Communication error with accessory card

What does Com.err. Acc. 173- 179* mean?

This indicates a communication fault with the accessory card. It resets automatically when communication is resumed. The accessory may be blocked.

• Defective communication cables
• Accessory activated but not connected
• Incorrectly connected communication cable
• Incorrectly set dipswitch
• No electrical supply to the accessory card

Click steps to track your progress.

1. 1

   Check all communication cables and connections to the accessory card.

2. 2

   Verify the accessory is correctly connected and powered.

3. 3

   Ensure dipswitches are set correctly.

4. 4

   If the problem persists, contact a service technician.