User guide

5-2 DL3800 DS1 Inverse Multiplexer User Guide—February 1999
5
BUTTON OVERVIEW
The DL3800 has four front panel buttons. The unit generally responds to a
button when it is pressed. Pressing and holding a button results in a
repeating action after one-half second.
The front panel buttons are also used for Alarm Cutout. When an alarm
condition occurs, the External Alarm Output contacts close. This typically
actuates external alarm indicators such as bells or alarm lights. Pressing
any of the four front panel buttons clears the condition, and turns off the
external bell or light.
Exit Button
The EXIT button is used to cancel operations or exit to a higher level menu
loop from a sub-menu loop. This button doubles as a left arrow button in a
few situations.
Up Arrow and Down Arrow Buttons
The up arrow button is used to move to the previous menu item or
conÞguration option.
The down arrow button is used to move to the next menu item or
conÞguration option.
Pressing both the up arrow and the down arrow buttons simultaneously
(the End Test combination), terminates all active tests on the local unit and
brings the front panel menu to the Test Menu showing the test that has just
been terminated. If no tests are active, pressing the End Test combination
has no effect.
Enter Button
The ENTER button is used to select a sub-menu loop or conÞguration
option. This button doubles as the right arrow button in a few situations.
END TEST
EXIT ENTER