Specifications

Section 3 OPERATION
3-1. INTRODUCTION. - This section describes operation of the front panel controls. There
are three operator switches, the LCD display and an alarm indicator. All functions for both A and
B channels are controlled by these components. The functions are:
1. Turn either channel "on" or "off".
2. Set frequency of either channel.
3. Activate or deactivate the compressor/expander.
Alarm indications appear on the LCD display but are not controlled by the operator.
Both hardware and software have been designed to make reprogramming as "tamper proof" as
possible. The Program/Execute switch is recessed so it will not inadvertently be operated. All
program changes must start with the operation of the Program/Execute switch and must end with
the operation of the Program/Execute switch. If this sequence is not followed, none of the changes
will take effect. If programming is initiated and no operator action takes place for approximately
12 seconds (before the final press of the Program/Execute switch) the display will revert to its
previous status and you will need to start over.
3-2. APPLYING POWER.
NOTE: The last status of a unit is retained even when power is removed. The next time power is
applied, the unit will return to it's previous settings.
When power is first applied, the LCD display goes through four steps.
1. The LCD goes black to show all segments are functioning.
2. The display will show the unit model number.
__________________ __________________
_450 Transmitter _ or _450 Receiver _
__________________ __________________
3. The software version will be displayed.
__________________
_Software Rev #.#_
__________________
4. The present status of both channels is shown.
Note: Information for the "A" channel is given in the left-hand half of the display
window, and for the "B" channel in the right-hand half.
The unit is now operational and ready for any changes the operator may desire.
450 Operation Manual Rev A Page 16 8/26/99