Monitoring & communications – Liebert UPStation GX User Manual
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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.