Honeywell RAEGuard Lite Quick Start Manual page 13

point (it can be at one end of the controller or detector, but not at the same time). By default,
a resistance of 270 ohm (RL) is connected between the detector terminals. Before
connecting with the controller, remove the resistor.
If the RAEGuard Lite transmitter you purchase supports the HART function, connect it to the
HART terminal by referring to the following figure:
Terminals
5.2)
Note: When wiring, open the top cover of the detector in advance and pull out the circuit
modules such as the display and the mainboard.
Cable connection
5.3)
Note: All cables or connections on the transmitter must be sealed with certified plugs or
glands!
Industrial grade armored cables are recommended for RAEGuard Lite connection cables.
RAEGuard Lite gas detector needs the power supply between 16VDC and 32VDC provided
by the controller or upper system. For the cable connection distance, please read the "User's
+24VDC
4-20mA
GND
Terminal
+24V
4-20mA
GND
A
RS485A/+
RS485B/-
LOW ALARM-NO
LOW ALARM-COM
LOW ALARM-NC
HIGH ALARM-NO
HIGH ALARM-COM
B
HIGH ALARM-NC
FAULT ALARM-NO
FAULT ALARM-COM
FAULT ALARM-NC
ALARM
C
SENSOR
D
Copyright © 2022 Honeywell International Inc. All rights reserved.
250Ω Host
computer or
controller
HART
Terminal
Identification
+VE Supply (16-32VDC)
4-20mA current&HART output
-VE Supply
MODBUS A(+)
MODBUS B(-)
Low alarm - Normally Open
Low alarm - Common
Low alarm - Normally Closed
High alarm - Normally Open
High alarm – Common
High alarm - Normally Closed
Fault - Normally Open
Fault – Common
Fault - Normally Closed
External SP-07PLUS
Connect with sensor
Definition Remarks
Controller
MODBUS
RTU
Note: If the
function
is not
purchased
at the time
of ordering,
there is no
terminal.
Optional
5