Liebert GXTTM - Manual (Page 23)

21
COMMUNICATIONS INTERFACE PORT
The UPStation GXT UPS contains a standard DB-9 socket located on the rear of
the UPS unit. Several signals are provided on this port and are assigned as
follows:
PIN ASSIGNMENT DESCRIPTION
1 Low Battery (open collector)
2 UPS TxD (typical RS-232 levels)
3 UPS RxD (typical RS-232 levels)
4 Remote Shutdown (5-12V); battery operation
5 Common
6 Remote Shutdown (short to pin 5) UPS mode (all modes) of operation
7 Low Battery (open emitter)
8 Mains Fail (open emitter)
9 Mains Fail (open collector)
PIN ASSIGNMENT COLLECTOR TO EMITTER*
*Maximum voltage and current on pins 1,7,8,9 is 80V DC; 10.0 mA.
CAUTION: TO MAINTAIN SAFETY (SELV) BARRIERS AND FOR
ELECTROMAGNETIC COMPATABILITY, SIGNAL CABLES SHOULD BE
SEGREGATED AND RUN SEPARATE FROM ALL OTHER POWER CABLES,
BY 25mm WHERE APPLICABLE.
UPS Remote shutdown option.
Shorting pins 5 and 6 on the DB9 connector will shutdown the UPS output in any
mode of operation. Removing the short circuit, the UPS will automatically auto-
restart.
Where there is a requirement for a remote shutdown of the UPS to meet fire or
other local safety codes, it is necessary to interrupt, at the same time with the
same pushbutton, all mains input supplies to the UPS. The pushbutton that
provides the UPS remote shutdown must be of the stay-down type ( Latching) to
keep a short circuit on pins 5 and 6 until mechanically unlatched by hand.
Note ; The wiring for remote stop contacts pins 5 and 6 of the DB9 connector are
defined as SELV . When connecting to a stop button interfacing with other mains
emergency stop circuits, keep wiring segregated from other power wiring.