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MONITORING & COMMUNICATIONS
The UPStation® GX UPS is capable of communicating with a stand-alone computer
system, LAN server, UNIX host, or terminal via an EIA standard DB-25 female connector
located on the rear of the unit.
The UPS typically uses this capability to provide status and power monitoring information to
the computer system. For instance, during a power outage, the operating system uses
UPS information to automatically save information in buffers, close files, and shutdown
operations in an orderly fashion prior to exhausting the UPS battery.
Depending on your system configuration, the operating system may monitor power via the
UPS and control UPS operations using a variety of interface hardware. The UPS
communication interface port provides the signals and control pins required by monitoring
and control applications.
Connect the UPS and your computer system with the appropriate cable and SiteNet®1
shutdown software (sold separately). Consult your local Liebert representative to
determine the correct software kit for your application.
Intelligent Communications
Serial Communications Port - Connection not to exceed NEC Class 2 limits. The DB-25
port provides several signals listed below by pin number:
PIN FUNCTION PIN FUNCTION
1 Reserved 14 On Inverter (active low)
2 RxD 15 On UPS (active closed)
3 TxD 16 On battery (active closed)
4 Not Used 17 Common (for pins 15,16,18,24)
5 Not Used 18 On battery (active open)
6 Not Used 19 UPS shutdown (active high)
7 Signal ground 20 Not Used
8 Not Used 21 Low battery (active low)
9 Low battery relay contact (common) 22 Not Used
10 Low battery relay contact (active opened) 23 Not Used
11 Low battery relay contact (active closed) 24 On Bypass (active closed)
12 Shutdown (active low) 25 Altos specification tri-
voltage signal
13 Power failure (active high)
In addition to power monitoring information signals, the UPS communicates intelligently
with LAN servers, UNIX hosts, or other connected computer systems. Optional SiteNet® 2
software allows these additional capabilities:
Quantitative monitoring of utility and UPS power
Quantitative monitoring of internal UPS parameters
Periodic tests of battery quality and replacement notification
Timed and delayed shutdown of the UPS
Logging of power disturbances and anomalies
Consult your Liebert sales agent for more information about SiteNet® 2 software.
SNMP Communications
An optional internal SNMP card (and SiteNet’ SNMP software) allows communication
through several network management systems. Call your Liebert supplier.