AVer SA series - Manual (Page 83)

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6. Select the brand, model and com port of UPS unit. And then, click Finish.
i To check the com port number, go to DVR application → Setup → System → POS Advance
→ Add → Port Setting → Local COM
7. Click Apply to check if the UPS setting is correct.
8. And then, click OK to complete the UPS setting.
9. User also need to enable UPS and set the capacity percentage level for shutdown in the DVR
application(see also (11) UPS (Uninterruptible Power Supply in System Setup).