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Connecting Eaglehawk Via Its Rs485-2 Interface To A Bacnet Ms/Tp Bus - Honeywell CENTRA LINE EAGLEHAWK Installation & Commissioning Instructions

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EAGLEHAWK CONTROLLER – INSTALLATION & COMMISSIONING INSTRUCTIONS

Connecting EAGLEHAWK via its RS485-2 Interface to a BACnet MS/TP Bus

With regards to Fig. 35 and Fig. 36, please note the following:
NOTE:
Always power each EAGLEHAWK controller and the connected BACnet MS/TP modules via separate transformers.
NOTE:
For "L," see section "RS485 Standard" on pg. 8.
NOTE:
If any devices are not electrically isolated, signal ground connection is recommended. See section "RS485 Standard"
on pg. 8).
NOTE:
Between devices equipped with non-isolated RS485 bus interfaces, potential differences of max. ±7 V are allowed.
Further, this bus should not extend beyond a single building.
Example 1: Single EAGLEHAWK Controller and Connected BACnet Modules (with inserted termination
resistor)
EAGLEHAWK
2930 31
GND-2
+5V
GND-2
Module #2
550 OHM
130 OHM
550 OHM
RS485-2 (+) RS485-2 (-)
NO EFFECT ON RS485-2
1 2
BACnet
Module #1
F1
24 V
230 V
Fig. 35. Connection of a single EAGLEHAWK controller via its RS485-2 interface to a BACnet MS/TP Bus
The termination resistor must be inserted directly into the terminals of the last BACnet MS/TP module.
Example 2: Multiple EAGLEHAWK Controllers and Connected BACnet Modules
EAGLEHAWK
29
30
31
GND-2
+5V
GND-2
Module #2
550 OHM
130 OHM
550 OHM
RS485-2 (+)
RS485-2 (-)
NO EFFECT ON RS485-2
1
2
BACnet
Module #1
F1
24 V
230 V
Fig. 36. Connection of multiple EAGLEHAWK controllers via their RS485-2 interfaces to a BACnet MS/TP Bus
EN1Z-1005GE51 R0216
BACnet
BACnet
Module #3
*CONNECT GND, IF AVAILABLE.
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
BACnet
Module #4
L
EAGLEHAWK
GND-1
BACnet
GND-1
+5V
ISO
Module
47 kOHM
1
24 V
230 V
22
BACnet
BACnet
Module #N-1
Module #N
EAGLEHAWK
24
25
26
29
GND-1
+5V
47 kOHM
550 OHM
130 OHM
RS485-1 (+)
RS485-1 (-)
RS485-2 (+)
MID
2
1
2
BACnet
BACnet
Module #N-1
Module #N
F1
F1
24 V
230 V
R
T
120 OHM
30
31
GND-2
GND-2
550 OHM
RS485-2 (-)
NO EFFECT ON RS485-2

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