EAGLEHAWK NX CONTROLLER – INSTALLATION & COMMISSIONING INSTRUCTIONS
41
EN1Z-1039GE51 R1218
Example 2: Multiple EAGLEHAWK NX Controllers and Connected BACnet Modules
1
1
1
1
2
2
2
2
24
V~
24
V~
24
V~
24
V~
24
~
0
24
~
0
24
~
0
24
~
0
24
24
25
25
26
26
BACnet
Module #2
RS
48
5
+
RS
48
5
-
GN
D
BACnet
Module #4
RS
48
5
+
RS
48
5
-
GN
D
F1
F1
F1
F1
230 V
230 V
230 V
230 V
24 V
24 V
24 V
24 V
L
GND-1
GND-1
+5V
ISO
+5V
ISO
RS485-1 (+)
RS485-1 (+)
RS485-1 (-)
RS485-1 (-)
47 kOHM
47 kOHM
END
EN
D
BI
AS
MID
END
EN
D
BI
AS
MID
EN
D
BI
AS
MI
D
MID
EN
D
BI
AS
MI
D
MID
24
24
25
25
26
26
GND-1
GND-1
GND-1
GND-1
+5V
ISO
+5V
ISO
RS485-1 (+)
RS485-1 (+)
RS485-1 (-)
RS485-1 (-)
550 OHM
550 OHM
150 OHM
150 OHM
550 OHM
550 OHM
BACnet
Module #1
BACnet
Module #3
BACnet
Module #N-1
BACnet
Module #N
GND-1
47 kOHM
GND-1
47 kOHM
*CONNECT GND, IF AVAILABLE.
EAGLE-
HAWK NX
EAGLE-
HAWK NX
EAGLE-
HAWK NX
EAGLE-
HAWK NX
Fig. 45. Connection of multiple EAGLEHAWK NX controllers via their RS485-1 interfaces to a BACnet MS/TP Bus
Example 3: Multiple EAGLEHAWK NX Controllers and Connected BACnet Modules (with inserted termination
resistor)
1
1
1
1
2
2
2
2
24
V~
24
V~
24
V~
24
V~
24
~0
24
~0
24
~0
24
~0
24
24
25
25
26
26
RS
48
5 +
RS
485 -
GND
BACnet
Module
RS
48
5 +
RS
485 -
GND
F1
F1
F1
F1
230 V
230 V
230 V
230 V
24 V
24 V
24 V
24 V
L
GND-1
GND-1
+5V
ISO
+5V
ISO
RS485-1 (+)
RS485-1 (+)
RS485-1 (-)
RS485-1 (-)
47 kOHM
47 kOHM
END
EN
D
BI
A
S
MID
EN
D
BI
A
S
MI
D
MID
EN
D
BI
A
S
MI
D
MID
24
24
25
25
26
26
GND-1
GND-1
GND-1
+5V
ISO
+5V
ISO
RS485-1 (+)
RS485-1 (+)
RS485-1 (-)
RS485-1 (-)
550 OHM
550 OHM
150 OHM
550 OHM
GND-1
550 OHM
GND-1
47 kOHM
GND-1
47 kOHM
BACnet
Module #1
BACnet
Module #N
EN
D
BI
A
S
MI
D
BIAS
R
T
BACnet
Module #2
BACnet
Module #3
BACnet
Module #N-1
*CONNECT GND, IF AVAILABLE.
120 OHM
EAGLE-
HAWK NX
EAGLE-
HAWK NX
EAGLE-
HAWK NX
EAGLE-
HAWK NX
Fig. 46. Connection of multiple EAGLEHAWK NX controllers via their RS485-1 interfaces to a BACnet MS/TP Bus
The termination resistor must be inserted directly into the terminals of the last BACnet MS/TP module (in this example, that is
the rightmost EAGLEHAWK NX, the 3-position slide switch of which has been set to "BIAS.")