Connecting Eaglehawk Nx Via Its Rs485-1 Interface To A Modbus - Honeywell CENTRA LINE EAGLEHAWK NX Installation & Commissioning Instructions

EAGLEHAWK NX CONTROLLER – INSTALLATION & COMMISSIONING INSTRUCTIONS

Connecting EAGLEHAWK NX via its RS485-1 Interface to a Modbus

With regards to Fig. 49, please note the following:
NOTE: Always power each EAGLEHAWK NX controller and the connected Modbus slaves via separate transformers.
NOTE: For "L," see section "RS485 Standard" on pg. 10.
NOTE: If any of the devices are electrically isolated, it is recommended that those devices be connected to signal ground. See
section "RS485 Standard" on pg. 10.
Example: EAGLEHAWK NX Modbus Master Controller and Connected Modbus Slaves (with inserted
termination resistor)
EAGLE-
HAWK NX
242526
GND-1
+5V GND-1
ISO
Module #2
550 OHM 150 OHM 550 OHM
RS485-1 (+) RS485-1 (-)
END
1 2
Modbus
Module #1
F1
24 V
230 V
Fig. 49. Connection of an EAGLEHAWK NX Modbus master controller via its RS485-1 interface to a Modbus with slaves
The termination resistor must be inserted directly into the terminals of the last Modbus slave.
NOTE: In this example, any or all of the Modbus RTU slaves depicted here can be EAGLEHAWK NX Modbus RTU slaves. In
such cases, an EAGLEHAWK NX Modbus RTU slave positioned at the end of the Modbus (as "Modbus Module #N")
must have its 3-position slide switches set to "End" (see Fig. 16) (the insertion of the aforementioned termination
resistor is then unnecessary) and any EAGLEHAWK NX Modbus RTU slaves positioned elsewhere on the Modbus
must have their 3-position slide switch set to "Mid" (see Fig. 14).
EN1Z-1039GE51 R1218
Modbus Modbus
Module #3
*CONNECT GND, IF AVAILABLE.
L
Modbus
Module #4
44
Modbus Modbus
Module #N-1 Module #N
R
T
120 OHM