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Can I install multiple APC SmartSlotAccessory Cards in one UPS?

Issue
Can I install multiple APC SmartSlotAccessory Cards in one UPS?

Product Line

APC Branded UPS models with the following model prefixes or names (that contain a DB-9 style serial port)
- SURT
- SURTA
- Symmetra Power Array
- Symmetra RM
- Symmetra LX
- Symmetra PX (excluding PX 250/500)
- SU
- SUA
- SUM

Environment

All serial numbers
All firmware versions

Cause
Depending on the UPS type, it may only offer one SmartSlot. If a user requires multiple SmartSlot cards to be installed, this article describes what is available to accomplish that and any associated requirements.

Resolution
APC does manufacture a SmartSlot Expansion Chassis for multiple APC SlotSlot Accessory cards, though this chassis is considered a legacy product. The part number for the Expansion Chassis is AP9600. The AP9600 can be used with any aforementioned UPS containing an existing SmartSlot.

The AP9600 attaches to the DB-9 serial port on your UPS system. You can daisy-chain multiple Expansion Chassis units off of one UPS. However, with two or more Expansion Chassis, you will need a 24VDC power adapter for each additional Expansion Chassis. APC does offer a 24VDC power adapter. The part number is AP9505.

APC also offers the Triple Chassis, part number AP9604BLK. The AP9604BLK contains three additional SmartSlots and is also considered a legacy product. When using all three slots or daisy-chaining the Triple Chassis, the 24VDC power adapter will be needed.

Please see the following link for installing multiple SmartSlot accessories in a supported UPS system:

https://www.apc.com/us/en/download/document/SPD_ASTE-6Z5QFC_EN/

Note, How do I properly install/uninstall my SmartSlot accessory card into my UPS? may also be helpful with the installation of SmartSlot accessories in general.