There is a fault in the communications cable, the serial interface in the uninterruptible power supply 2145 UPS-1U, or 2145.
Check that the communications cable is correctly plugged into the 2145 and the 2145 UPS-1U. If the cable is plugged in correctly, replace the FRUs in the order shown.
Possible Cause-FRUs or other:
2145-CF8, or 2145-CG8