6.3 RS-232 Interface Port (Standard)
The RS-232 interface uses a 9-pin female D-sub connector. This information consists of data
regarding utility (AC) power, the load and the UPS. The interface port pins and their functions are
identified in the following table:
Pin#
Signal
Direction (UPS)
Functions
2
TxD
Output
TxD Output
3
RxD
Input
RxD / Inverter Off Input
5
Common
Common
6
CTS
Output
AC Failure Output
8
DCD
Output
Low Battery Output
9
RI
Output
+8 to +24 VDC Power
NOTE:
Maximum rating is 24 VDC / 50mA
6.4 USB Port
Connecting the UPS to the computer is accomplished using a free USB port on the computer. A
USB compliant operating system is necessary as well as hardware and the installation of a UPS
driver. The serial port cannot be used when using the USB port. The required USB cable comes
with the UPS when this option is specified. Connection is shown in Fig. 2.
6.5 EPO Port (Emergency Power Off)
The EPO port allows an immediate emergency shutdown to be activated remotely by disconnecting
and removing power from the UPS output. Any manual or automatic shutdown procedures
including those directed by power management software, are overridden. To activate, make sure
the UPS and loads are first turned off. Remove the jumper from the EPO connector, and
connect an insulated dry contact (NC, 60VDC, 30VAC, 20mA) using #17 AWG/1mm
dia.
wire to the EPO port. Power up the UPS and loads and test the EPO function.
6.6 Network Transient Protector (Optional)
The network transient protector, located on the rear panel, consists of both IN and OUT jacks
housed on a separate RJ-45 (10BaseT) network card. If used, make sure that the input and the
output are connected to the appropriate jack.
6.7 Load Segments (Where applicable)
The power management software controls individual sets of output receptacles on the UPS called
"load segments" which provide controlled and sequential startup and shutdown of loads. Less
critical equipment can be turned off during power outages saving battery power for more critical
loads. Load segment status can be viewed from the LCD display on the UPS and can be changed
if necessary. Load segments are usually controlled by the UPS management software.
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