User`s guide

–62–
Product Information
Specifications
continued
Advanced port
interface
The Advanced port of MasterSwitch plus has the same limitations and
capabilities as the Basic ports (see “Basic port interface” on page 61),
with the following additional limitations and capabilities:
• Applying a momentary (approximately 1 second) high
RS-232
level to Pin
7
turns the
UPS
and its loads on. A momentary low
RS-
232
level turns the
UPS
and loads off. Pin
7
should be normally
unconnected. This signal is passed through the MasterSwitch
plus.
•
DC
operating voltage is available on Pin
8
of the Advanced port.
This may be the
UPS
battery voltage or the voltage from an
external adapter, whichever is greater.
Advanced
port pin
assignments
Continued on next page