Detcon 840-RD - Manual (Page 13)

6 . 0
System Configuration
6.1 Password Protection
Password protection is accomplished via a switch selection on the backside of the Controller PCB. (Figure
7 SW1.) With SW1 position 4 in the ON position, the Controller will be in Password Protected mode. In
this mode there is no access to the Menus. The only functionality provided for is the Main Display and the
use of the Reset and Acknowledge functions. With SW1–4 in the OFF position, Password Protection is
turned off and there is complete access to the Menus.
RS-485 Input for
Gas Sensor Switch 1 pos 4 Password
Protect Switch
1 2 3 4
ON
OFF
part of Control Board
Figure 7 Password Protect SW1
6.2 Navigating the Menus
The user-interface for configuring gas channels and alarms is very simple to use. The menu text is
displayed on the backlit LCD and is interfaced via the four function keys located below it. These keys are
labeled from left to right: PROG, UP, DOWN, ENTER. The ENTER key is a multiple-use key that also
controls the Reset and Acknowledge relay functions. With reference to the Menu Flow Chart (See Figure
9) and the correct function key sequencing, one can easily learn how to navigate the menus, make changes,
and access the logged data.
PROG Key:
From the Main Display, the PROG key enters into the Main Menu. Once inside the Main Menu, the
PROG key acts as an “Escape” key that moves backwards in the Menu flow chart.
“Up Arrow” Key:
This key moves the user up the Main Menu flow chart. It is also used to change highlighted entries
within menu selections in the upward direction.
“Down Arrow” Key:
This key moves the user down the Main Menu flow chart. It is also used to change highlighted entries
within menu selections in the downward direction.
ENTER and Reset/Ack Key:
This key has a multiple-use purpose. The ENTER function is used to accept selections within all Menu
screens.
Model 840-RD Operator Manual Rev. 0 Page 9 of 14