ADT Security Services 400 User Manual

Unimode 400 Operations PN 50709:A  10/20/97

5

The system operates in Normal mode when no alarms or troubles exist.  In Normal 
mode, the control panel displays a system message as follows:

In Normal mode, the control panel does the following functions at regular intervals:

•

Polls all Signaling Line Circuit (SLC) devices and the four NACs to check for valid 
replies, alarms, troubles, circuit integrity, and so on.

•

Checks power supply troubles and batteries every 10 seconds.

•

Sends a supervisory query on the ADT-LCD-80 and verifies proper response.

•

Refreshes the LCD and the optional ADT-LCD-80 display and updates time.

•

Scans the keypad for a System Reset or an Enter key press.

•

Performs a detector automatic test operation.

•

Tests system memory.

The system goes into Trouble mode when the control panel detects an electrical or 
mechanical fault.  With no alarms, a control panel in Trouble mode does the following:

•

Produces a pulsed audible tone;

•

The System Trouble LED flashes; 

•

The trouble relay activates (MPS-400, TB5); and 

•

Sends a message to the LCD display, an optional ADT-LCD-80, an optional 
printer, and the history file.   

Figure 4 shows a typical Trouble message:

Note:  M500CH modules report 

both open and short circuit 
messages.

1.

Press <Acknowledge/Step> to silence the panel sounder and switch the System 
Trouble LED from flashing to steady—regardless of the number of troubles, 
alarms, and supervisory signals.

2.

Pressing <Acknowledge/Step> while at least one new alarm or trouble exists, 
causes the control panel to send an Acknowledge message to the history file and an 
optional printer.

 YOUR CUSTOM FORTY CHARACTER MESSAGE HERE
ALL SYSTEMS NORMAL 11:30A TUE 02/11/97

 TROUBL PULL STATION     I.C.U. WEST WING
Z1 INVALID REPLY     11:45PM TUE 02/11/97

Custom descriptor for this 

device location

Type of device 

Software zone 
assigned (Zone 1)

Time and date

Type of event (trouble)

Type of trouble