Honeywell CENTRA LINE EAGLEHAWK Installation & Commissioning Instructions page 21

Example 2: Multiple EAGLEHAWK Controllers and Connected BACnet Modules
EAGLEHAWK
24 25 26
GND-1
+5V GND-1
ISO
Module #2
550 OHM 150 OHM 550 OHM
RS485-1 (+) RS485-1 (-)
END
1 2
BACnet
Module #1
F1
24 V
230 V
Fig. 33. Connection of multiple EAGLEHAWK controllers via their RS485-1 interfaces to a BACnet MS/TP Bus
Example 3: Multiple EAGLEHAWK Controllers and Connected BACnet Modules (with inserted termination
resistor)
EAGLEHAWK
24 25 26
GND-1
+5V GND-1
ISO
Module #2
550 OHM 150 OHM 550 OHM
RS485-1 (+) RS485-1 (-)
END
1 2
BACnet
Module #1
F1
24 V
230 V
Fig. 34. Connection of multiple EAGLEHAWK 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, the 3-position slide switch of which has been set to "BIAS.")
EAGLEHAWK CONTROLLER – INSTALLATION & COMMISSIONING INSTRUCTIONS
EAGLEHAWK
24 25 26
GND-1
BACnet
+5V
ISO
47 kOHM 47 kOHM
RS485-1 (+) RS485-1 (-)
MID
1 2
BACnet
Module #3
F1
24 V *CONNECT GND, IF AVAILABLE.
230 V
EAGLEHAWK
24 25 26
GND-1
BACnet
+5V
ISO
47 kOHM 47 kOHM
RS485-1 (+) RS485-1 (-)
MID
1 2
BACnet
Module #3
F1
24 V *CONNECT GND, IF AVAILABLE.
230 V
L
EAGLEHAWK
GND-1
BACnet
GND-1 +5V
ISO
Module #4
47 kOHM
RS485-1 (+)
1 2
24 V
230 V
L
EAGLEHAWK
GND-1
BACnet
GND-1 +5V
ISO
Module
47 kOHM
RS485-1 (+)
1 2
24 V
230 V
21
EAGLEHAWK
24 25 26 24 25
GND-1
GND-1 +5V
ISO
47 kOHM 550 OHM 150 OHM
RS485-1 (-) RS485-1 (+) RS485-1 (-)
MID
1 2
BACnet BACnet
Module #N-1 Module #N
F1 F1
24 V
230 V
EAGLEHAWK
24 25 26 24 25
GND-1
GND-1 +5V
ISO
47 kOHM 550 OHM
RS485-1 (-) RS485-1 (+) RS485-1 (-)
MID
1 2
BACnet BACnet
Module #N-1 Module #N
F1 F1
24 V
230 V
EN1Z-1005GE51 R0216
26
GND-1
550 OHM
END
R
T
120 OHM
26
GND-1
550 OHM
BIAS