C400R User Manual
Page 4
COMMUNICATION PORTS
RS232/USB
The RS232 and USB communication ports cannot be used
simultaneously.
•
Connect the communication cable to the serial or USB port on
the computer.
•
Connect the other end of the communication cable to the
RS232 or USB communication port on the UPS.
Both RS232 and USB connections allow for 2 way communication between the device connected and the UPS. This
can be used for both issuing configuration commands, communicating with the UPS and issuing shutdown commands.
When connected via USB to a PC the UPS will present itself as a HID compliant ACPI device allowing for zero
configuration shutdown initiated by the UPS in the event of a power failure.
EPO CONNECTION
The EPO (Emergency Power Off) connection allows the UPS to be powered off by changing the state of either a
normally open or normally closed circuit. The default state of the connection can be configured via the LCD display
settings.
•
Normally open - Normally the EPO circuit is open on the rear
panel. Once the connector is closed with a wire, the UPS will
stop output until EPO status is reset.
•
Normally closed - Normally EPO connector is closed with a
wire on the rear panel. Once the connector is open, the UPS
will stop output until the EPO status is disabled.
DRY IN/DRY OUT CONTACTS
Dry in allows maintenance bypass to be remotely switched on and off. When the contact changes the maintenance
bypass is switched on or off depending on its current state.
Dry out could indicate the status of UPS.
The Dry out port is normally closed, if the Dry out port is open it indicates an event has occurred such as:
Output overload
On battery mode
Battery low
Battery disconnected
Bypass enabled
