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Network UPS Tools

Opti-UPS smart protocol

This is a partial decoding of the protocol used in the Opti-UPS PowerES models. There are a bunch of things missing, and the UPS itself is very difficult to probe due to an annoying 20 second pause every time a command is sent.

Command Apparent meaning Typical value
AG UPS Status This field is in hex, but it's bitmapped.

  • bit 3: 1 = overload
  • bit 4: 1 = replace battery
  • bit 5: 1 = on battery, 0 = on line
  • bit 6: 1 = low battery
Test group
TR Test results
  • 00 = Unknown
  • 01 = Passed
  • 02 = Warning
  • 03 = Error
  • 04 = Aborted
  • 05 = In Progress
  • 06 = No test init
Battery group
BT Battery temperature (deg C) 0033
BV Battery voltage (.1 volts) 0140
Configuration group
FA Output VA 0280
FF Input frequency (.1 Hz units) 600
FH High transfer point 144
FL Low transfer point 093
FO Output volts 120
FP Output power 0280
FR Output frequency (.1 Hz units) 600
FT Transfer point? 121
FV Input voltage 120
Input group
IM Manufacturer OPTI-UPS
IO Model 280es
IS Firmware version V1.5B2 (change this and their software stops working)
IZ Serial number 801292607978
Input group
NF Input frequency (.1 Hz) 605
NV Input voltage 114
Output group
OF Output frequency (.1 Hz) 605
OL Output load 75
OV Output volts 120

Cable information

According to contributor Stephen S., the stock PnP cable that is provided with the unit does not work properly with Linux. Cables using this pinout should perform better.
  • UPS 6 - PC 3
  • UPS 9 - PC 2
  • UPS 4 - PC 5

UPS end = male, PC end = female.

No more updates

I no longer have access to this hardware, so this page will probably remain frozen in this state forever. The 20 second delay was unbelievably annoying, so this turn of events is not entirely bad. If you can circumvent this problem and want to continue the page, then contact me.
Last updated: 30 October 2003 / rkroll Valid HTML 4.01!