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Bacnet Ms/Tp Bus Connection; Bacnet Ms/Tp Bus Considerations; Connecting Eaglehawk Via Its Rs485-1 Interface To A Bacnet Ms/Tp Bus - Honeywell CENTRA LINE EAGLEHAWK Installation & Commissioning Instructions

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EAGLEHAWK CONTROLLER – INSTALLATION & COMMISSIONING INSTRUCTIONS

BACNET MS/TP BUS CONNECTION

The EAGLEHAWK controller features two RS485 interfaces to which BACnet MS/TP devices can be connected: RS485-1
(consisting of push-in terminals 24 [GND-1], 25, and 26) and/or RS485-2 (consisting of push-in terminals 29, 30, and 31 [GND-
2]).
NOTE:
GND-2 is internally connected with 24V-0 (terminal 1)

BACnet MS/TP Bus Considerations

RS485-1 (isolated)
Max. BACnet MS/TP bus length: 800-1200 meters, depending on baud rate (see section "RS485 Standard" on pg. 8).
˗
˗
Use only shielded, twisted-pair cable and daisy-chain topology.
˗
Must conform to EIA-RS485 cabling guidelines (see section "EIA 485 Cable Specifications" on pg. 18).
RS485-2 (non-isolated)
Max. BACnet MS/TP bus length: 800-1200 meters, depending on baud rate (see section "RS485 Standard" on pg. 8).
˗
˗
Use only shielded, twisted-pair cable and daisy-chain topology.
˗
Ground noise should not exceed the EIA-485 common mode voltage limit.
˗
Must conform to EIA-RS485 cabling guidelines.
˗
Should not extend beyond a single building.

Connecting EAGLEHAWK via its RS485-1 Interface to a BACnet MS/TP Bus

With regards to Fig. 32 through Fig. 34, 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).
Example 1: Single EAGLEHAWK Controller and Connected BACnet Modules (with inserted termination
resistor)
EAGLEHAWK
242526
GND-1
+5V
GND-1
ISO
Module #2
550 kOHM
150 kOHM
550 kOHM
RS485-1 (+) RS485-1 (-)
END
1 2
BACnet
Module #1
F1
24 V
230 V
Fig. 32. Connection of a single EAGLEHAWK controller via its RS485-1 interface to a BACnet MS/TP Bus
The termination resistor must be inserted directly into the terminals of the last BACnet MS/TP module.
EN1Z-1005GE51 R0216
BACnet
BACnet
Module #3
*CONNECT GND, IF AVAILABLE.
L
BACnet
Module #4
20
BACnet
BACnet
Module #N-1
Module #N
R
T
120 OHM

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