D9112 Operation & Installation Manual
Page 39
© 1993 Radionics
74-06144-000-C 2/96
Wiring Data Expansion Loops to POPEX Modules
There are two positive (+) and two negative (-) data expansion loop terminals on each
POPEX module. Follow the procedure below to connect the data expansion loops to the
D8125 POPEX Module. See Figure 13. Remember, you can only connect a maximum of
63 POPITs to one D8125.
1. Connect the positive (+) Data terminal from the first POPIT on the data expansion
loop to one of the D8125 module’s positive (+) terminals.
2. Connect the negative (-) Data terminal from the first POPIT on the data expansion
loop to one of the D8125 module’s negative (-) terminals.
POPIT Sensor Loops
The number of normally-open and/or normally-closed detection devices each sensor loop
can supervise is limited only by the resistance on the loop. Resistance on each sensor
loop must be less than 100 ý with the detection devices connected.
Certain UL and NFPA applications may limit the number of detection devices. Consult the
appropriate UL or NFPA standards.
POPITs detect open, shorted, normal, and grounded circuit conditions on their sensor
loops. They transmit the condition of their loops to the D9112. A ground on the sensor
loop reports as a open condition. Each POPIT is programmed and transmits to the D9112
separately.
Terminate each POPIT sensor loop with the 33k ý end-of-line resistor (Radionics
D106F) included with each POPIT.
Radionics recommends you use twisted-pair wire in all POPEX/POPIT installations for
both the data expansion loop wiring and the POPIT sensor loops. Run wires away from
AC sources to prevent AC induction. If you suspect a noisy environment, use shielded
cable. See

Premises Wiring

in the

Installation

section.
DATA
(-)(+) LOOP
DATA
(-)(+) LOOP
DATA
(-)(+) LOOP
DATA
(-)(+) LOOP
DATA
(-)(+) LOOP
DATA
(-)(+) LOOP
DATA
(-)(+) LOOP
DATA
(-)(+) LOOP
D8125
POPEX
MODULE POINTS 9 - 71
NEGATIVE (-)
POSITIVE (+)
UP TO 63 POPITS
(-)
(-)
(+)
(+)
GND
OUT
IN
AUX
D8127
POPIT
DATA EXPANSION LOOP
D8125
POPEX
MODULE POINTS 73 - 135
NEGATIVE (-)
POSITIVE (+)
UP TO 63 POPITS
(-)
(-)
(+)
(+)
GND
OUT
IN
AUX
DATA EXPANSION LOOP
SWITCHES 1 TO 6
33K Ω E.O.L.
RESISITOR
SWITCHES 1 TO 6
33K Ω E.O.L.
RESISITOR
Figure 13: Typical Expansion Loop/POPIT Configuration