Xtreme Power Conversion Corporation
G90 User’s Manual
Page 11
Uninterruptible Power Supply
RS232 Communications
The RS-232 interface uses a 9-pin female D-sub connector. Information provided includes data about utility, load
and the UPS. The interface port pins and their functions are identified in the following table:
PIN #
FUNCTIONS
1,4,6,7,8,9
Reserved
2
UPS transmit
3
UPS receive
5
Ground
SNMP Communications Option
The UPS provides an intelligent slot for internal or external network card. This special intelligent network card can
be compatible with popular software and hardware found on the web and in operating systems. It can support op-
erating systems such as HP Open View, IBM Netview, SUN Netmanager, etc. This enables the UPS to provide instant
UPS and power information over the network. Please contact your reseller for additional details.
Emergency Power Off (EPO) Port
A customer supplied switch located remotely can be used to close the EPO connection and allows the UPS output
receptacles to be switched off. Since the EPO shuts down the equipment immediately, orderly shutdown proce-
dures are not followed by any power management software. The UPS will have to be manually restarted in order
to regain power to the outlets on the UPS.
Keep Pin 1 and Pin 2 closed for UPS normal operation. To activate EPO function, cut the wire between Pin 1 and
Pin 2.
Warning:
The EPO circuit is an IEC 60950 safety extra low voltage (SELV) circuit. This circuit must be
separated from any hazardous voltage circuits by reinforced insulation.
Caution:
The EPO must not be connected to any utility connected circuits. Reinforced insulation to the
utility is required. The EPO switch must have a minimum rating of 24VDC and 20mA, and be a dedicated latching-
type switch, not tied to another circuit. The EPO signal must remain active for at least 250ms for proper operation.
To ensure the UPS stops supplying power to the load during any mode of operation, the input power must be
disconnected from the UPS when the emergency power off function is activated.
Note:
For Europe, the emergency switch requirements are detailed in Harmonized document HD-384-48 S1, “Elec-
trical Installation of the Buildings, Part 4: Protection for Safety Chapter 46: Isolation and Switching”.