Honeywell CENTRA LINE EAGLEHAWK NX - Page 41

EAGLEHAWK NX CONTROLLER – INSTALLATION & COMMISSIONING INSTRUCTIONS
41 EN1Z-1039GE51 R1218
Example 2: Multiple EAGLEHAWK NX Controllers and Connected BACnet Modules
1 11 12 22 2
24V~ 24V~ 24V~ 24V~ 24~0 24~0 24~0 24~0
24 2425 2526 26
BACnet
Module #2
RS485 +
RS485 -
GND
BACnet
Module #4
RS485 +
RS485 -
GND
F1 F1F1 F1
230 V 230 V230 V 230 V
24 V 24 V24 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
END BIAS MID
END
END BIAS MID
END BIAS MID
MID
END BIAS MID
MID
24 2425 2526 26
GND-1 GND-1
GND-1 GND-1
+5V ISO +5V ISO
RS485-1 (+) RS485-1 (+)RS485-1 (-) RS485-1 (-)
550 OHM 550 OHM150 OHM 150 OHM550 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 11 12 22 2
24V~ 24V~ 24V~ 24V~ 24~0 24~0 24~0 24~0
24 2425 2526 26
RS485 +
RS485 -
GND
BACnet
Module
RS485 +
RS485 -
GND
F1 F1F1 F1
230 V 230 V230 V 230 V
24 V 24 V24 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
END BI
A
S
MID
END BI
A
S
MID
MID
END BI
A
S
MID
MID
24 2425 2526 26
GND-1
GND-1 GND-1
+5V ISO +5V ISO
RS485-1 (+) RS485-1 (+)RS485-1 (-) RS485-1 (-)
550 OHM 550 OHM150 OHM 550 OHM
GND-1
550 OHM
GND-1
47 kOHM
GND-1
47 kOHM
BACnet
Module #1
BACnet
Module #N
END BI
A
S
MID
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.")