Digital Monitoring Products Inc PC0128 User Manual

The Overcurrent LED (OVC) lights Red when the devices

connected to the Keypad Bus draw more current than the

auxiliary output rating. The OVC LED is located above

terminals 9 and 10 as shown in Figure 4. When the OVC LED

lights Red, the Keypad bus/auxiliary power (terminal 7) and

the Programming header (J8) shut down.

Nominal 12 VDC at 100mA maximum (shared by terminal 25)

is supplied at terminal 11 to power 4-wire smoke detectors or

other auxiliary powered devices. This output can be turned 

off by the user for 5 seconds using the Sensor Reset option 

in the User Menu. Terminal 10 is the ground reference for

terminal 11.

On XT30/XT50 panels, terminals 12 to 24 are the nine burglary zones. For programming purposes, the zone

numbers are 1 to 9. The zone configurations on terminals 12 to 24 are described below.
 Terminal  Function 

12

Zone 1 voltage sensing

19

Ground for zones 5 & 6

13

Ground for zones 1 & 2

20

Zone 6 voltage sensing

14

Zone 2 voltage sensing

21

Zone 7 voltage sensing

15

Zone 3 voltage sensing

22

Ground for zones 7, 8, & 9

16

Ground for zones 3 & 4

23

Zone 8 voltage sensing

17

Zone 4 voltage sensing

24

Zone 9 voltage sensing

 

18 

Zone 5 voltage sensing

The voltage sensing terminal measures the voltage across the 1k Ohm End-of-Line resistor and the zone’s

ground terminal. Dry contact sensing devices can be used in series (normally-closed) or in parallel (normally-

open) with any of the burglary protection zones.

Each burglary protection zone detects three conditions: open, normal, and short.
The parameters for each are listed below:

   Open

over 1300 ohms

over 2.0 VDC

  Normal

600 to 1300 ohms

1.2 to 2.0 VDC

   Short

under 600 ohms

under 1.2 VDC

J3

Phone Line

J7 RJ 

Supervision

OVC LED

Power 

LED

1K Ohm

Normally

Closed

1K Ohm

Normally Open

1K Ohm

Combination Normally Open

and Normally Closed