OM-550
u
3
u
2.1.1 ACTIVITY LED & HORN
The Activity LED and internal horn provide a quick indication of the unit's status. For
example a short, periodic
beep
and
flash
indicates that the OM-550 is “ON” but not
being programmed.
The horn produces two different sounds, a
beep
and
blat
. Valid key closures produce
the
beep
sound and invalid keys produce the
blat
. For example, the
OK
key is only
used in programming. Pressing the
OK
key when not programming will produce a
blat
sound.
Figure 2-3
•
A periodic
beep-beep
and
flash-flash
indicates that the OM-550 is being
programmed.
•
Key closures override this regular activity with a steady
beep
(or
blat
) whenever
a key is pressed.
•
If no activity is evident (
beeps
and
flashes
, or printing), the unit is “OFF”.
Menus are printed when a choice is available. Then, when the operator presses a
key the resulting Selection is printed to confirm the action. In most cases, the
user need not wait for a menu to print before making a selection. Experienced
operators can operate the unit very swiftly, with little printing. If the unit
blats
,
just wait for the menu to print, then continue by pressing the correct key(s).
ACTIVITY LED
