Connecting Rs485-2 To Bacnet Ms/Tp Buses - Honeywell Centra Line EAGLE Installation & Commissioning Instructions

EAGLE CONTROLLER – INSTALLATION & COMMISSIONING INSTRUCTIONS

Connecting RS485-2 to BACnet MS/TP Buses

2930 31
+5V
ISO
550 OHM 130 OHM
RS485-2 (+) RS485-2 (-)
1 2
F1
24 V
230 V
NOTE: Always power the EAGLE and connected BACnet MS/TP modules with separate transformers.
NOTE: N = max. 30 modules.
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.
Termination resistors must be inserted directly into the terminals of the individual BACnet MS/TP modules.
EN1Z-0970GE51 R1112
EAGLE
GND-2
GND-2
550 OHM
Fig. 34. Connection of RS485-2 to a BACnet MS/TP Bus
L
*
BACnet
Module #1
*Connect, if available.
24
120 Ohm
*
BACnet
Module #N
R
T