Installation Guide

D9412GV4/D7412GV4/D7212GV4 | Installation and Operation Guide | 9.0 Off-Board Points
Bosch Security Systems, Inc. | 3/12 | F01U266054-01 53
Figure 19: Wiring Multiple D8128Ds Using Interconnect Wiring
COM IN OUT+12V
P1
P2
COM IN OUT+12V
P1
P2
28
27
26
25
24
23
COM IN OUT+12V
P1
P2
1
2
3
4
5
6
7
8
9
1 - D9412GV4 Control Panel
2 - Yellow
3 - Green
4 - Black
5- Red
6 - First D8128D
7 - Second D8128D
8 - Third 8128D
9- Up to 15 per Zonex Bus
A maximum of four D8128Ds can be installed on the D7212GV4.
9.4.7 OctoPOPIT Sensor Loops
Only the resistance on the loop limits the number
of normally-open or normally-closed detection
devices each sensor loop can supervise.
Resistance on each sensor loop must be less than
100  with the detection devices connected.
Certain UL and NFPA applications can limit the
number of detection devices. Consult the
appropriate UL or NFPA standards.
The OctoPOPIT detects open, short, closed,
normal, and grounded circuit conditions on its
sensor loops and sends the conditions to the
control panel. Each sensor loop has an assigned
point number and sends signals to the control
panel separately.
Use twisted-pair wire for the OctoPOPIT sensor
loops to avoid EMI problems. Run wires away
from the premises telephone and AC wiring. If
you suspect a noisy environment, use shielded
cable.
The OctoPOPIT has two rows of terminal
numbers. In the row nearest to the terminal
blocks, the positive outputs for the sensor loops
are labeled P1 to P8. Sensor loop outputs P1 and
P2, P3 and P4, P5 and P6, and P7 and P8 share
common terminals. The common terminals for
each pair are labeled COM.
Terminate each OctoPOPIT sensor loop with a 1
k
Ω
EOL resistor. Attach a resistor even if you do not
enable the loop. The OctoPOPIT includes a
D105BL resistor for each sensor loop. Refer to
Figure 20 on page 54.
Do not duplicate point assignments. Points do
not function properly if assigned to an
OctoPOPIT sensor loop and a POPIT, to two
OctoPOPIT sensor loops, or to two POPITs.