EAGLE CONTROLLER – INSTALLATION & COMMISSIONING INSTRUCTIONS
EN1Z-0970GE51 R1112 24
Connecting RS485-2 to BACnet MS/TP Buses
1 2
24V~
24~0
EAGLE
2930 31
R
T
120 Ohm
GND-2
GND-2
+5V
ISO
RS485-2 (+) RS485-2 (-)
550 OHM 550 OHM130 OHM
BACnet
Module #1
RS485 +
RS485 -
GND
BACnet
Module #N
**
*Connect, if available.
RS485 +
RS485 -
GND
F1
230 V
24 V
L
Fig. 34. Connection of RS485-2 to a BACnet MS/TP Bus
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.
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