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Honeywell Midas User Manual

Honeywell Midas
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Midas
®
Gas Detector
10-10
10.2.3 Other Characteristics
WINK Command
The LonWorks
®
“wink” command causes the service
LED to energize for approximately six seconds.
LED Interpretation
All LED operation is inhibited for 35 seconds after
power-up. This is because the neuron is held in reset
until the internal ARM-7 microprocessor boots. If
the neuron is “unconfigured”, after 35 seconds the
yellow service LED will flash slowly. If the neuron is
“configured” the service LED will be dark.
The interface contains a second LED which can be
useful for debugging. This is red in color and only
visible when the lid is removed from the interface.
It is labeled D15 and is located immediately below
the black FT-X1 transformer on the PCB. D15 will
blink every second when the neuron is executing
code correctly. This will be “on” most of the time if
communication to the Midas
®
is successful. It will
be “off” most of the time if communications to the
Midas
®
is unsuccessful. Communications is certain
to be unsuccessful for 190 seconds after power-up
due to the Midas
®
boot time.
Caution
After commissioning, Echelon’s LonMaker
tool will put this device into the “oine”
state. In this mode, the Midas
®
interface
will not transmit over LonWorks
®
. To
correct this, it is necessary to click-right,
on the device, select “Manage” and click on
“Online”
Compatibility with old LonMaker
This device is observed to work incorrectly with
Echelon LonMaker for Windows version 3.00.66.
This is because it was created with NodeBuilder
version 3.1 and contains an XIF file in format version
4. The problem is manifested as network variables
having the wrong direction – outputs appear as
inputs. The problem can be corrected by replacing
a file in the network management tool with a new
version. This file is “C:\LonWorks\bin\XIF32Bin.
exe”. Echelon has granted permission for this file to
be copied freely. A copy of this file can be obtained
from Honeywell Analytics on request.

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Honeywell Midas Specifications

General IconGeneral
Power Supply24 VDC
Detection TechnologyElectrochemical, Infrared
Sampling MethodDiffusion
DisplayLCD
CommunicationModbus RTU, 4-20mA
Operating Temperature-20°C to +50°C
Humidity Range0% to 95% RH (non-condensing)
Target GasMultiple gases
Response Time< 30 seconds
Operating Humidity0% to 95% RH (non-condensing)
Outputs4-20mA
Protection RatingIP66
CertificationsATEX, UL, CSA
Detection GasesOxygen (O2), Carbon Monoxide (CO), Hydrogen Sulfide (H2S), Methane (CH4), and others

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