Addressable Interface Wiring
International Gas Detectors
SCREEN
SCREEN
UP
DOWN
PC
P Y W
DISPLAY
SCREEN
+24V
+24V
B
NC
B
V+
V+
A
COMM
A
4-20mA
4-20mA
0V
NO
0V
1 2 3 4 5
SCREEN
+24V
B
A
0V
ZERO
F
AUL
T
CAL
360
CHASS
24V DC
B
A
GND
mA
P
Y
W
mA+
360
CONC
0V
mA-
Control Panel
4 Core Screened Cable
Typically FP200, SY or
CY Sytle Cables.
Refer to IGD Cable Sizing
Guide For Further
Information
ZERO
F
AUL
T
CAL
360
CHASS
24V DC
B
A
GND
mA
P
Y
W
mA+
360
CONC
0V
mA-
Example - Flammable Gas Detector
Example - Flammable Gas Detector
Note: It does not matter which connector is used
as either the cable in or cable out connection
Devices can be in any order on an addressable highway but it
is advisable to install in address sequence as thi swill aid
future servicing
NOTE: WHEN SETTING ADDRESSES YOU CANNOT HAVE TWO DEVICE ADDRESSES SET
THE SAME ON THE SAME ADDRESSABLE HIGHWAY.
IGD addressable systems use a 4 core cable or highway to connect all system devices. Typically an
addressable highway will support up to 32 devices as any mix of gas detectors, addressable relays,
addressable inputs. You must not have duplicate device addresses on the same highway cable. Some
Controllers support more than one highway, in this case it is allowed to have the same addresses on
different highway cables on the same controller. An addressable highway can run for up to 1000M but it
must be ensured that the cable size is large enough to keep the supply voltage over 17V DC. Use the
IGD cable sizing guide to check required cable sizes.
120
W
At the last device on the
highway it is advisable if
the cable run is over
250M to fit a 120
W
resistor across the A-B
terminals. This will reduce
‘noise’ on the highway
and aid reliability. Under
250M of Cable This is Not
Required.
