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Smart UPS Modular Ultra shows RS232 Communication Entry

Issue:

The UPS shows RS232 comm alarm detected 140B-0000 entry every few seconds on the display and power event log.

Example of the event log:

10/01/2024 13:34:26 Device RS232 comm alarm cleared [140A-00A0]. 0x02B8
10/01/2024 13:34:25 Device RS232 comm alarm detected [140B-00A0]. 0x02B9
10/01/2024 13:31:25 Device RS232 comm alarm cleared [140A-00A0]. 0x02B8
10/01/2024 13:31:25 Device RS232 comm alarm detected [140B-00A0]. 0x02B9
10/01/2024 13:28:25 Device RS232 comm alarm cleared [140A-00A0]. 0x02B8
10/01/2024 13:28:25 Device RS232 comm alarm detected [140B-00A0]. 0x02B9
10/01/2024 13:25:25 Device RS232 comm alarm cleared [140A-00A0]. 0x02B8
10/01/2024 13:25:24 Device RS232 comm alarm detected [140B-00A0]. 0x02B9
10/01/2024 13:22:24 Device RS232 comm alarm cleared [140A-00A0]. 0x02B8
10/01/2024 13:22:24 Device RS232 comm alarm detected [140B-00A0]. 0x02B9

Product Line:

Smart UPS Modular Ultra

Environment:

All models, all serial numbers

Resolution:

The firmware has been improved to correctly handle the situation that causes the entry to appear repeatedly in the log.

Please upgrade the UPS to at least firmware 17.0, then clear all alarms if needed.

In order to upgrade the UPS properly, please use the following FAQ - https://www.apc.com/us/en/faqs/FAQ000261838/

If the alarm returns after upgrading the firmware, please contact support.