1997 Radionics All rights reserved
The Radionics logo is a registered trademark of Radionics,
1800 Abbott Street, Salinas, CA 93901, USA
74-07649-000-B 01/97
D9024/D10024 Installation
Page 5 of 17
B. Circuit Connections
The D9024 and D10024 Fire Alarm Control Panels (FACP) are analog systems. They exchange data
and may provide power to devices over two-wire circuits. Radionics recommends shielded single pair
twisted cable wiring with a drain wire such as Atlas #218 or West Penn Wire/CDT #D293.
West Penn Wire/CDT #D293 has a nominal capacitance of 28 pf/ft between conductors.
Data Circuit Length
is the distance over the circuit wire from the connection at the Control Module to
the most distant device and back to the Control Module. Data Circuit Length must include the distance
to any device connected to the circuit in a “T” tap.
B.1. Polling Circuit (D9067)
Detection devices in the analog system receive power and communicate with the control panel over
a two-wire circuit. The Digital Communications Protocol (DCP) resists interference from most types
of EMI and RF generated noise, and there are no special wiring requirements other than attention to
the wire gauge. Under extremely noisy conditions, twisted pair wire is recommended to reduce
interference. If EMI is a problem, use shielded cable, being careful to ground the drain wire to the
“E” terminal on the D10024M board. See
Figure 2
.
Polling Circuit Length
Wire Gauge
Up to 4,000 ft.
18
4,000 - 7000 ft.
16
Table 1: Polling Circuit Length/wire Gauge
Note: The screw terminals will accept 14 AWG, but this will reduce the allowable length of the
circuit.
Any devices in the system that are not analog and are connected to the Digital Communications
Protocol (DCP) bus must be powered from a separate pair of conductors.
Each analog device is assigned a specific address by setting dip switches on that device. Each
D9067 polling circuit can support up to 126 addresses. It is not necessary to wire devices in any
particular order in a circuit.
The systems are expanded by adding D9067 Polling Circuit Modules to the Control Module. The
D10024 has five expansion slots for polling circuits. The D9024 has three.
+
CIRCUIT
POLLING
MODULE
Shield Cable Drain
Earth Ground for
MODULE
Data/power Common Out
Data/power Positive Out
Data/power Common Return
Data/power Positive Return
-
D9067
CIRCUIT
POLLING
D9067
LOOP
+
-
E
-
2
+
-
E +
LOOP
1
Figure 2: Ground Location on Control Module
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