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The Smart-UPS is a series of enterprise-level uninterruptible power supplies (UPS) made by American Power Conversion (APC).[1] Most of the units have a SmartSlot (with the exception of SC and SMC series) which accepts an optional interface card providing features ranging from network connectivity to temperature and humidity monitoring.[2] With the exception of RT and SRT series, Smart-UPS units are line-interactive UPS systems, only running their inverters when the grid power is unavailable.


Internals of a rack-mountable Smart-UPS 2200XL.
An oscillogram showing a true sine-wave inverter output of a Smart-UPS SMT1500I.

There are a few different variations in the Smart-UPS lineup.

Model Characteristics
Smart-UPS The standard model, with true sine-wave inverter output. Later known as the Smart-UPS SMT.
Smart-UPS SC A simplified version of the Smart-UPS, based on Back-UPS architecture with no SmartSlot expansion and with modified sine wave output. It is incompatible with many active PFC PC power supplies.[3]
Smart-UPS SMC An economy version of the Smart-UPS SMT, with no SmartSlot expansion and with a simplified LCD display. It outputs a pure sinewave.
Smart-UPS XL An "extended run" series, with an Anderson Powerpole DC connector allowing up to 10 external battery packs to be daisy-chained to the main unit.
Smart-UPS RT, Smart-UPS SRT An online/double-conversion variant providing no switchover delay during a power loss.
Smart-UPS VT Uses three-phase power, for larger installations.

Management software[edit]

  • All Smart-UPS units work with APC's proprietary PowerChute software which is available for a variety of operating systems.
  • A free alternative to PowerChute is the Free software project APC UPS Daemon (Apcupsd), which supports Linux, Mac OS X, UNIX and Microsoft Windows operating systems and can run in stand alone or client-server modes.
  • Legacy Smart-UPS (Not SMX, SMT, or SURTD series [4]) can also work with Network UPS Tools (NUT), a third party application, under Linux.[5] The software is designed to safely and automatically shut down any connected computers before the batteries are depleted.

Data interfaces[edit]

AP9606, an early SmartSlot Web/SNMP Management Card

As a way to provide UPS management, monitoring and automatic shutdown of attached equipment, all Smart-UPS models include at least one serial data interface (RS-232 or USB), while most models also have at least one SmartSlot expansion port, with the larger (and in many cases older) Smart-UPS models supporting two SmartSlots. Availability of more SmartSlots in a single Smart-UPS unit can be achieved via expansion modules such as the AP9600 and AP9604 models.[6][7] Installing an add-on card into a SmartSlot will provide the UPS with additional features, capable beyond the default serial data interface.

Early SmartSlot cards, such as the AP9605, provide SNMP functionality and Telnet access.[8] The AP9606 and later cards add a web interface that can be used to configure and administer the UPS, as well as email-based alerting. The AP9617 and newer cards add 10/100 Ethernet connectivity, Secure HTTP, Secure Shell (SSH), RADIUS, SNMP Version 3, PCNS and syslog functionalities.[9] The AP9612, AP9618, AP9619 and AP9631 models provide environmental monitoring when used together with APC temperature/humidity probes.[10][11][12] The AP9618 model also provides out-of-band management via a modem connection in case the 10/100 Ethernet connection is down.

SmartSlot cards remain powered by the battery even when the UPS is switched off, allowing the UPS to be remotely cold-started even in a power loss situation (presuming the network infrastructure is still powered up and functioning). The cards will also continue to work for a short while after the UPS has been switched off either manually or due to a low battery condition.[citation needed]

Beginning with the 2009 release of the SMT models (and later SMX and SURTD models), the old RS-232 data interface (a serial port with DB-9 connector) has been replaced with a 10-pin RJ50 socket and an RJ50-to-DB-9 cable connecting to the protected computer's serial port (together with a standard USB interface[13]). Also, SmartSlot interface has been electrically modified in a backward-incompatible way and appropriately keyed mechanically. As stated by APC, "the new connection arrangement denotes the new signalling systems."[citation needed] These new serial and SmartSlot interfaces use the new Microlink signalling protocol which, unlike the previous APC protocol UPSLINK, as of April 2015 has not been publicly documented. However, using the new AP9620 interface card, users are able to add support for the previous signalling protocol to the newer SMT and SMX models. Addition of this card makes the current models backwards compatible with older software built for the older Smart-UPS series.

As of August 2013, an additional option has been made available in form of new firmware for certain SMT and SURTD models, adding publicly documented Modbus signalling capability to the proprietary Microlink protocol, allowing third-party developers to support UPS signalling and control on the newer Smart-UPS series.[14][15]

SmartSlot card models[edit]

An AP9617 SmartSlot Network Management Card sitting on top of a Smart-UPS SMT1500I, showing the differences in slot keying

In late 2009, with the release of the SMT and SMX product lines, SmartSlot was migrated to a new communications platform utilizing the APC Microlink protocol. Both electrical and mechanical (slot keying) properties of the new SmartSlot make older SmartSlot cards incompatible with current Smart-UPS models.[16] For example, current (as of April 2015) Smart-UPS model SMT1500 is compatible only with AP9613, AP9620, AP9630 and AP9631 SmartSlot cards.[17]

This new card/slot design is referred-to as "Network Management Card 2" or NMC2. However, most NMC2 cards (including AP9613, AP9630 and AP9631) are backward compatible with older Smart-UPS models.[18]

In 2019, APC released Network Management Card 3 or NMC3 (AP9640/AP9641), superseding NMC2 cards. NMC 3 offers enhanced security (Security chip onboard), faster communication (1000BASE/T) and increased space for data and event logs.[19]

AP9630 SmartSlot Network Management Card 2 (NMC2): top side of the PCB, bottom side of the PCB, and card's front panel that contains Ethernet and serial console ports (from top to bottom)
Model Characteristics[18]
AP9603 Token Ring SNMP Management Card
AP9605 10BASE-T SNMP Management Card
AP9606 10BASE-T Web/SNMP Management Card
AP9607 Two-port Serial Interface Expander Card
AP9608 Out-of-band Management Card (Call-UPS II)
AP9610 Dry Contact Relay I/O Card
AP9612TH Environmental Monitoring Card
AP9613 Dry Contact Relay I/O Card (AP9335T, AP9335TH and AP9810 available as accessories)
AP9615 Five-port 10BASE-T Hub Card
AP9617 10/100BASE-T Network Management Card
AP9618 Same as AP9617 plus Environmental Monitoring, Out-of-band Management and I/O Contacts/Relay Controls
AP9619 Same as AP9617 plus Environmental Monitoring and IO Contacts/Relay Controls
AP9620 Legacy Communications Card - Adds Serial & USB Connectivity
AP9622 Modbus Interface Card
AP9623 Smart Signalling Serial Interface Expander Card
AP9624 UPS Interface Expander 2 Card
AP9630 10/100BASE-T Network Management Card 2 (NMC2)
AP9631 Same as AP9630 with Environmental Monitoring
AP9635 Same as AP9630 with Environmental Monitoring, Out-of-band Management and Modbus
AP9640 10/100/1000BASE-T Network Management Card 3 (NMC3)
AP9641 Same as AP9640 with Environmental Monitoring
AP9644 NMC4 Card (preinstalled in Galaxy VS range only)
AP9649 Cloud Connection Card

See also[edit]


  1. ^ "Country Selection Page".
  2. ^ "Country Selection Page".
  3. ^ "Country Selection Page".
  4. ^ "Apcupsd a daemon for controlling APC UPSes".
  5. ^ "Network UPS Tools - Hardware compatibility list".
  7. ^ "APC SmartSlot Triple Chassis Black".
  8. ^ "AP9605 Network Management Card".
  9. ^ "UPS Network Management Card". Archived from the original on January 18, 2014.{{cite web}}: CS1 maint: unfit URL (link)
  10. ^ "AP9618 Network Management Card".
  11. ^ "AP9619 Network Management Card". Archived from the original on October 29, 2013.{{cite web}}: CS1 maint: unfit URL (link)
  12. ^ "AP9631 Network Management Card".
  13. ^ "APC USB cable scheme".
  14. ^ "Modbus Implementation in APC Smart-UPS" (PDF). apcmedia.com. 2014-09-19. Retrieved 2015-04-26.
  15. ^ Hegde, Subrahmanya (2019-06-25). "Frequently Asked Questions for the new SMX and SMT series of Smart-UPS products" (PDF). APCestorewale. Subrahmanya Hegde by APCestorewale. Retrieved 2015-05-07.
  16. ^ "APC Smart-UPS 1500VA LCD 120V". APC. Retrieved 2016-04-17.
  17. ^ a b "Additional Management Cards and Options: Quick Reference Sheet" (PDF). apcmedia.com. 2016-03-07. Archived from the original (PDF) on 2016-04-26. Retrieved 2016-04-17.
  18. ^ "Network Management Card 3 Introduction & Frequently Asked Questions" (PDF). APC. Retrieved 2020-04-29.

External links[edit]