Installation
LT-0180 (4/94)
881 Expansion Interface Card
For Use with DMP 1912XR Command Processor Panels
Description
The 881 Expansion Interface Card allows you to connect additional 714 and 715 Loop Expander Modules to
the 1912XR Command Processor panel. Loop expanders connect in parallel to a 4-wire bus consisting of two
data wires, auxiliary power, and a panel common wire. See Figure 1.
Installing the 881 module
The 881 card plugs onto the J9 connector of the 1912XR panel and uses an adhesive backed plastic standoff
mounted in the center to hold securely in place.
1912XR Panel
J9 Expansion Connector
Adhesive backed standoff
attaches to microprocessor.
J3 Loop Expansion Connector
LPX
Red
Black
Red - To terminal 7
Black - To terminal 10
Loop Expander Harness
{
Bk - Aux. Common
Gr - Serial Data Out
Yl - Serial Data In
Rd - Aux. Positive
Figure 1: Installing the 881 on the 1912XR panel
Follow the instructions below when installing the 881 card:
1. Remove AC and battery power from the 1912XR panel before installing the 881.
2. Remove the paper strip from the base of the plastic standoff.
3. Hold the 881 card on the upper left and right corners using the thumb and index finger of each hand and
carefully align the 40 pin connector of the 881 with the J9 connector on the 1912XR panel.
4. Gently press the 881 into the J9 connector while applying even pressure on both sides.
5. Connect the loop expander bus to the J3 Loop Expansion Connector.
6. Connect the Black wire from the 881 card to terminal 10 on the 1912XR panel.
7. Connect the Red wire from the 881 card to terminal 7 on the 1912XR panel.
8. Power for devices connected to the 881 card is provided by the panel's auxiliary power terminals 7 and
10. You can also add a regulated auxiliary power supply. When using a separate power supply, connect
a wire from the negative terminal of the power supply to terminal 10 of the 1912XR panel.
9. Restore AC and battery power to the 1912XR.
881 Installation
2500 N. Partnership Boulevard Springfield, MO 65803
www.dmpnet.com
Digital Monitoring Products
Installing Multiple Expansion Devices
1912XR Command Processor
881
Expansion
Interface
DMP 714 and 715 Loop Expanders
can be used together on the same
1 2
3 4
5
6
7
AC AC B + B - BELLGND
8 YEL9 GRN
14 L115GND
19 L4
10
BLK1SMK
12 L5+
13 L516L2 17L3 18GND
expansion wiring.
Red
Yellow
Terminal 7
Auxiliary Power
Green
Black
Terminal 10
Panel Common.
Terminal 1 1
Switched
MODEL 715
LOOP
EXP ANDER
MODEL 714
LOOP
EXP ANDER
Aux. Power
MODEL 715
LOOP
EXP ANDER
Always connect a wire from the
negative of the power supply to
An auxiliary UL
listed power
supply can be used to extend
terminal 10 of the 1912XR
Command Processor panel.
device mounting distances.
MODEL 714
LOOP
EXP ANDER
12 VDC
Auxiliary
Power Supply
AC
T o AC transformer
Do NOT use the 1912XR
AC transformer
Figure 2: Device and power supply connection to the 881 card.
Wiring Distances for Multiple Expansion Devices
# of expansion
devices on 881
Distance when powered
from panel
Distance when powered from
auxiliary power supply *
22 AWG
18 AWG
22 AWG
18 AWG
1
3940'
9875'
7500'
9375'
2
2735'
6855'
7500'
9375'
3
1925'
4830'
7500'
9375'
4
1420'
3565'
7500'
9375'
5
1140'
2855'
7500'
9375'
6
900'
2250'
7500'
9375'
8
700'
1755'
7500'
9375'
10
550'
1370'
7500'
9375'
15
370'
930'
7500'
9375'
20
265'
660'
7500'
9375'
25
200'
495'
7500'
9375'
Figure 3: Expansion device wiring distances.
* Locate auxiliary power supplies at the far end of the wire run.
Digital Monitoring Products
2500 N. Partnership Boulevard Springfield, MO 65803 800-641-4282
MODEL 714
LOOP
EXP ANDER