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4 CCM840/1640 Installer/User Guide
Port history
Each CCM port has a buffer that holds the most recent 64K bytes of online and
offline serial data. A separate history command mode lets you navigate within
a port’s current history file and conduct tailored searches.
Safety Precautions
To avoid potential device problems, if the building has 3-phase AC power, ensure
that a computer and its monitor (if used) are on the same phase. For best results,
they should be on the same circuit.
To avoid potentially fatal shock hazard and possible damage to equipment,
please observe the following precautions:
• Do not use a 2-wire extension cord in any product confi guration.
• Test AC outlets at the computer and monitor (if used) for proper polarity
and grounding.
• Use only with grounded outlets at both the computer and monitor. When
using a backup Uninterruptible Power Supply (UPS), power the computer,
the monitor and the CCM unit off the supply.
NOTE: The AC inlet is the main disconnect.
Rack mount safety considerations
• Elevated Ambient Temperature: If installed in a closed rack assembly, the
operation temperature of the rack environment may be greater than room
ambient. Use care not to exceed the rated maximum ambient temperature
of the unit.
• Reduced Airfl ow: Installation of the equipment in a rack should be such
that the amount of airfl ow required for safe operation of the equipment is
not compromised.
• Mechanical Loading: Mounting of the equipment in the rack should be
such that a hazardous condition is not achieved due to uneven
mechanical loading.
• Circuit Overloading: Consideration should be given to the connection
of the equipment to the supply circuit and the effect that overloading of
circuits might have on overcurrent protection and supply wiring. Consider
equipment nameplate ratings for maximum current.
• Reliable Earthing: Reliable earthing of rack mounted equipment should
be maintained. Pay particular attention to supply connections other than
direct connections to the branch circuit (for example, use of power strips).