Chapter 2 Network Connection Specifications 2-9
ON: Indicates contacts are closed
OFF: Indicates contacts are open
Note1: Use a UPS capable of normal battery power supply operation for at least 10 to 60 seconds after this signal is turned on.
Note2: Use a UPS capable of normal battery power supply output without turning on the *ACOFF in an instantaneous commercial AC
power failure lasting two seconds or less.
Note3: Do not connect to ER signal pin.
TABLE 2-1 UPS Interface Signals
Signal name Definitions Pin number Remarks
*BPS/*UALM Signal indicates faulty UPS conditions 6
*BTL Signal provides a warning of a low battery
level and a pending UPS failure.
7Enabled with ON
(Note1)
*ACOFF Signal indicates power failure at the
commercial AC supply connector to the UPS
9Power failure: ON
Normal: OFF
(Note2)
SG Signal ground 5
ER Signal indicates the main unit is running
(Equipment Ready)
1(Note3)