Liebert UPStation GX ,

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.