Honeywell Centra Line HAWK 8000 Installation & Commissioning Instructions page 7

WARNING
Risk of electric shock or equipment damage!
Do not touch any live parts in the cabinet!
►
Disconnect the power supply before inserting or removing
►
the microSD flash memory card, making connections to
or removing connections from terminals of the HAWK
8000 Controller, Expansion Modules, or Panel Bus
I/O modules.
Do not reconnect the power supply until you have
►
completed installation.
It is prohibited to power the HAWK 8000 Controller with
►
the same transformer used to power other controllers or
devices (e.g., the PW M-Bus Adapter).
Observe the rules regarding electrostatic discharge.
►
Removal of the controller's cover is not required. No
►
configurable or user-serviceable items (e.g., jumpers or
battery) require cover removal.
To reduce the risk of fire or electrical shock, install the
►
device in a controlled environment relatively free of
contaminants.
To comply with FCC and Industry Canada RF exposure
►
limits for general population / uncontrolled exposure, the
antenna(s) used for this transmitter must be installed to
provide a separation distance of at least 20 cm from all
persons and must not be co-located or operating in
conjunction with any other antenna or transmitter.
RS485 Wiring
The HAWK 8000 is equipped with two RS485 ports operating
as COM1 and COM2. Each port is capable of up to 115,200
baud, and uses a 3-position, screw terminal connector.
DEVICE #N DEVICE #2 DEVICE #1 RS485 A
HAWK 8000
Fig. 10. RS485 wiring example
NOTE: RS485 devices on the same network should use the
same communication protocol and the same baud
rate. Up to 32 or more devices may be supported,
depending upon device specifications.
Use shielded, twisted-pair, 18-22 AWG cabling to wire in a
continuous daisy-chain fashion to the RS485 ports of other
devices: "minus to minus," "plus to plus," and "shield to
shield."
Connect the shield wire to earth ground at one end, only. Fig.
10 shows example wiring.
HAWK 8000 CONTROLLER – INSTALLATION & COMMISSIONING INSTRUCTIONS
RS485 B DEVICE #1 DEVICE #2 DEVICE #N
RS485 Ports and Bias / Termination Switches
Each of the two RS485 ports of the HAWK 8000 (see Fig. 8)
has an adjacent 3-position biasing switch, with the following
settings:
BIA (Default, middle position) RS485 biasing; 2.7 kΩ bias
resistors with no termination resistor.
END (Left position) RS485 biasing and termination; 562 Ω
bias resistors and 150 Ω termination resistor.
MID (Right position) no RS485 biasing; 47.5 kΩ bias
resistors with no termination resistor.
Adding RS485 biasing can often improve communications by
eliminating indeterminate idle states.
Each RS485 port has two LEDs. See also Fig. 14 on pg. 9.
In Fig. 11, Fig. 12, and Fig. 13, the internal wiring for RS485-
A is presented as an example. The RS485-B port has the
same internal wiring.
GND-A
2.7 kOHM
Fig. 11. RS485-A 3-position bias switch set to BIAS
GND-A
562 OHM 150 OHM
Fig. 12. RS485-A 3-position bias switch set to END
7
+5V
2.7 kOHM
(default)
+5V
562 OHM
EN1Z-1016GE51 R0218
ISO
ISO