Critical Environment Technologies CET-RDM User manual

Operation Manual
www.critical-environment.com
RDM Remote Display Module
Rev. B | 2021.12

2 © 2021 All rights reserved. Data subject to change without notice.
RDM - Operation Manual Rev. B | 2021.12
TABLE OF CONTENTS
1 POLICIES .......................................................................................................4
1.1 Important Note .................................................................................................4
1.2 Warranty Policy.................................................................................................5
1.3 Service Policy....................................................................................................5
1.4 Copyrights and Registered Trademarks......................................................6
1.5 Disclaimer..........................................................................................................6
1.6 Revisions............................................................................................................7
2 INTRODUCTION .............................................................................................8
2.1 General Description .........................................................................................8
2.2 Key Features .....................................................................................................8
3 INSTRUMENT SPECIFICATIONS....................................................................9
3.1 Technical Specications.................................................................................9
3.2 Enclosure Dimensions ................................................................................. 11
4 INSTRUMENT FEATURES ............................................................................12
4.1 Exterior Enclosure......................................................................................... 12
4.2 Interior System Layout................................................................................. 13
5 INSTALLATION ............................................................................................14
5.1 General Safety Warnings ............................................................................. 14
5.2 Protection Against Electrical Risks............................................................ 15
5.3 Protection Against Mechanical Risks ....................................................... 15
5.4 Enclosure Mounting Components............................................................. 15
5.4.1 Enclosure Interior Base.................................................................. 16
5.4.2 Enclosure Bottom ........................................................................... 17
5.5 Wiring Power Connections.......................................................................... 17
5.6 Wiring the RDM to the FCS.......................................................................... 18

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6 SYSTEM OPERATION & CONFIGURATION...................................................20
6.1 Navigating the Menu Structure .................................................................. 20
6.2 Accessing the Menu with Passcodes....................................................... 20
6.3 Power Up and Warm-up............................................................................... 21
6.4 Normal Display .............................................................................................. 21
6.5 Set LCD Display Contrast Level.................................................................. 23
6.6 Modbus® Settings........................................................................................ 24
6.6.1 Change Modbus® ID...................................................................... 24
6.6.2 Set Baud Rate .................................................................................. 25
6.7 Mask Lines ..................................................................................................... 26
6.8 Set Silence Duration ..................................................................................... 27
7 MAINTENANCE............................................................................................28
8 TROUBLE SHOOTING...................................................................................28

4 © 2021 All rights reserved. Data subject to change without notice.
RDM - Operation Manual Rev. B | 2021.12
1 POLICIES
1.1 Important Note
Read and understand this manual prior to using this instrument. Carefully read
the warranty policy, service policy, notices, disclaimers and revisions on the
following pages.
This product must be installed by a qualied electrician or factory trained
technician and according to instructions indicated in this manual.
This instrument has not been designed to be intrinsically safe. For your safety,
do not use it in classied hazardous areas (explosion-rated environments).
INSTRUMENT SERIAL NUMBER:
______________________________________________________
PURCHASE DATE:
______________________________________________________
PURCHASED FROM:
______________________________________________________

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1.2 Warranty Policy
Critical Environment Technologies Canada Inc. warrants the products we
manufacture (excluding sensors, battery packs, batteries, pumps, and lters)
to be free from defects in materials and workmanship for a period of two years
from the date of purchase from our facility. Sensors are consumable items and
once they leave our factory, we cannot reuse or resell them. As such, all sensor
sales are nal. Should the sensor itself be faulty, there is a one-year pro-rated
warranty that would apply from the date of purchase from our facility.
The warranty status may be affected if the instrument has not been used and
maintained as per the instructions in the manual or has been abused, damaged,
or modied in any way. The product is only to be used for the purposes stated
in the manual. Critical Environment Technologies is not liable for auxiliary
interfaced equipment or consequential damage.
Prior to shipping equipment to CETCI, contact our oce for an RMA #. All
returned goods, regardless of reason, must be accompanied with an RMA
number. Please read our Warranty and Returns Policy and follow our RMA
Instructions and Form.
Due to ongoing research, development, and product testing, the manufacturer
reserves the right to change specications without notice. The information
contained herein is based on data considered accurate. However, no warranty is
expressed or implied regarding the accuracy of this data.
1.3 Service Policy
CETCI maintains an instrument service facility at the factory. Some CETCI
distributors / agents may also have repair facilities; however, CETCI assumes
no liability for service performed by anyone other than CETCI personnel.
Repairs are warranted for 90 days after date of shipment (sensors have
individual warranties). Should your instrument require non-warranty repair, you

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RDM - Operation Manual Rev. B | 2021.12
may contact the distributor from whom it was purchased, or you may contact
CETCI directly.
Prior to shipping equipment to CETCI, contact our oce for an RMA #. All
returned goods, regardless of reason, must be accompanied with an RMA
number. Please read our Warranty and Returns Policy and follow our RMA
Instructions and Form.
If the product is deemed repairable, for liability reasons, CETCI will perform all
necessary repairs to restore the instrument to its full operating condition.
1.4 Copyrights
This manual is subject to copyright protection; all rights are reserved. Under
international and domestic copyright laws, this manual may not be copied or
translated, in whole or in part, in any manner or format, without the written
permission of CETCI.
Modbus® is a registered trademark of Gould Inc. Corporation.
BACnet® is a registered trademark of American Society of Heating,
Refrigeration and Air Conditioning (ASHRAE).
1.5 Disclaimer
Under no circumstances will CETCI be liable for any claims, losses or damages
resulting from or arising out of the repair or modication of this equipment
by a party other than CETCI service technicians, or by operation or use of the
equipment other than in accordance with the printed instructions contained
within this manual or if the equipment has been improperly maintained or
subjected to neglect or accident. Any of the forgoing will void the warranty.
Under most local electrical codes, low voltage wires cannot be run within the
same conduit as line voltage wires. It is CETCI policy that all wiring of our

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Rev. B | 2021.12 RDM - Operation Manual
products meet this requirement and all wiring be within properly grounded
(earth or safety) conduit.
1.6 Revisions
This manual was written and published by CETCI. The manufacturer makes
no warranty or representation, expressed or implied, including any warranty of
merchantability or tness for purpose, with respect to this manual.
All information contained in this manual is believed to be true and accurate at
the time of printing. However, as part of its continuing efforts to improve its
products and their documentation, the manufacturer reserves the right to make
changes at any time without notice. In addition, due to improvements made to
our products, there may be information in this manual that does not exist in the
version of the product the user has. Should you detect any error or omission
in this manual, or should you want to inquire regarding upgrading the device’s
rmware, please contact CETCI at the following address:
Critical Environment Technologies Canada Inc.
Unit 145, 7391 Vantage Way, Delta, BC, V4G 1M3, Canada
Toll Free: +1.877.940.8741
Telephone: [phone]
Email: [email protected]
Website: www.critical-environment.com
In no event will CETCI, its ocers or employees be liable for any direct, special,
incidental or consequential damages resulting from any defect in any manual,
even if advised of the possibility of such damages.

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RDM - Operation Manual Rev. B | 2021.12
2 INTRODUCTION
2.1 General Description
Thank you for purchasing our RDM Remote Display Module. The RDM Remote
Display is designed to connect to the FCS Flexible Control System to provide
convenient viewing of gas readings and system statuses in an alternate and
relevant location to the controller; such as a refrigeration application where
there are two different entrances to the chiller room.
The RDM will display much of the same information as the FCS, such
as gas level readings, channel status and faults.
2.2 Key Features
• 4-lines, 20 character LCD display and LED indicators for alarm STATUS 1,
2, 3 and Fault conditions
• Internal audible alarm
• Modbus®RS-485 RTU communication
• Output for remote strobe and/or horn connection
• Connection loss detection to ensure accurate information is displayed

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3 INSTRUMENT SPECIFICATIONS
3.1 Technical Specications
MECHANICAL
Enclosure
ABS / Polycarbonate, rated UL94-5VA, designed
to meet IP54 standards. Copper coated interior to
reduce RF interference.
Weight 272 g (9.6 oz)
Size 127 mm x 127 mm x 71 mm (5.0 in x 5.0 in x 2.8 in)
ELECTRICAL
Power Requirement 0.5 W of power using the 24 VDC supplied by the
controller
Current Draw 20.8 mA
Wiring 4-wire shielded network wiring between the controller
and RDM
Communication:
Modbus® RTU over
RS-485
Baud rate: 19,200 (default)
Modbus® ID: 230 (default)
Modbus® Broadcast ID: 253 (default)
Data bits: 8
Start bits: 1
Stop bits: 1
Parity: none
Fuses Automatic resetting thermal

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RDM - Operation Manual Rev. B | 2021.12
USER INTERFACE
Display
4-line, 20 character LCD display and LED indicators
for “STATUS 1, 2 and 3” , “FAULT”
Congurable contrast (default is 20)
Indicator Status LED indicators for low, mid, high and fault
alarms
Menu Accessed using up, down and enter push buttons
INPUT/OUTPUT
Communication Receives Modbus® commands from the FCS and
duplicates the much of the display information
Outputs One drive output for a 24V, max 500 mA remote
strobe/horn
Audible Alarm Internal buzzer
ENVIRONMENTAL
Operating
Temperature -20°C to 40°C (-4°F to 104°F)
Operating Humidity 15 - 90% RH non-condensing

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CERTIFICATION
Model: CET-RDM
S/N: RDM1603B00001
Rating: 24 VDC, 0.5W, Class 2
CERTIFIED FOR ELECTRIC SHOCK & ELECTRICAL FIRE HAZARD ONLY. LA
CERTIFICATION ACNOR COUVRE UNIQUEMENT LES RISQUES DE CHOC
ELECTRIQUE ET D’INCENDIE D’ORIGINE ELECTRIQUE.
Conforms to: CSA-C22.2 No. 205-12 & CSA-C22.2 No. 61010-1-12
Conforms to: UL508 (Edition 17):2007 & UL 61010-1 (Edition 3)
Conforms to: EMC Directive 2004/108/EC, EN 50270:2006, Type 1, EN61010
Conforms to: FCC. This device complies with part 15 of the FCC Rules,
Operation is subject to the following two conditions: (1) This device may not
cause harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
3.2 Enclosure Dimensions

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RDM - Operation Manual Rev. B | 2021.12
4 INSTRUMENT FEATURES
4.1 Exterior Enclosure
NUMBER FEATURE FUNCTION
Door Hinge Secures door.
Display 4 lines x 20 characters.
Status 1, 2, 3
LEDs Indicates channel alarm status.









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ARROW UP Press to scroll up through menu.
ENTER Press to select menu choice.
ARROW DOWN Press to scroll down through menu.
Fault LED Indicates unit fault condition.
Door Screw Secures the door of the enclosure.
4.2 Interior System Layout







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NUMBER FEATURE FUNCTION
Jumper Bank (J5)
Termination resistor. If this device is the
last one in the network chain, a termination
resistor should be connected by placing a
jumper in the EN position
Modbus®
Connector (TB2)
Terminal used to connect to the RDM to
the FCS
Modbus®
Connector (TB3)
Terminal used to connect other devices in
the Modbus®network
Remote Strobe
Terminal (TB1)
Connection for remote strobe or strobe/
horn
24V 500 mA max.
Test Points: TP1
& TP2 Used for measuring voltage output
Buzzer Internal audible alarm
5 INSTALLATION
5.1 General Safety Warnings
The RDM Remote Display is intended for indoor use, permanently mounted at
a height that is appropriate for viewing, outside an area that requires a visual
inspection of gas readings inside, prior to entry. The RDM should be protected
from extreme weather conditions.

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The RDM requires no assembly and virtually no maintenance. There are no
serviceable elements or replaceable components.
5.2 Protection Against Electrical Risks
The RDM Remote Display is designed to be powered by the FCS. Disconnect
all power to all network devices before servicing. There may be multiple
power sources. Power supply may have a building installed circuit breaker /
switch that is suitably located and easy to access when servicing is required.
Appropriate markings should be visible at the circuit breaker / switch that is
supplying power to controller.
This device may interfere with pacemakers. Modern pacemakers have built-in
features to protect them from most types of interference produced by other
electrical devices you might encounter in your daily routine. If you a have a
pacemaker, follow your healthcare provider’s instructions about being around
this type of equipment.
5.3 Protection Against Mechanical Risks
The door of the enclosure can be removed if absolutely necessary to facilitate
installation of the base but it is not recommended on this version. Extreme care
and caution must be exercised when removing the door to avoid damaging
the hinges. The door should only be removed when absolutely required. Any
damage occurring from door removal procedure will not be covered under
warranty.
Simply grasp the door with one hand, being careful not to make contact with
any of the internal components (circuit board), grasp the base with your other
hand. Tug on the base and pull straight apart. DO NOT TWIST. The section of
the hinges located on the base should “snap” apart from the part of the hinges
located on the door.

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RDM - Operation Manual Rev. B | 2021.12
After installation, simply locate the lid hinges over the installed base hinges and
pull toward you. The hinges should easily “snap” back into place.
The enclosure has one screw securing the door to the base for electrical safety
and provides an opening to allow the user to apply a padlock or tie wrap if they
desire the transmitter to be locked. Refer to Section 4.1 Exterior Enclosure.
Be aware that the hinged door that could potentially pinch ngers and the sharp
edges and/or jumper pins on the board could potentially prick or cut ngers if
not handled carefully.
5.4 Enclosure Mounting Components
5.4.1 Enclosure Interior Base







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NUMBER FEATURE
Door Hinge
Mounting Holes
5.4.2 Enclosure Bottom
NUMBER FEATURE
Door Hinge
1/2” Conduit Entry Knockout
5.5 Wiring Power Connections
The RDM Remote Display is a low voltage powered device. Any application
of operating voltages higher than indicated in the specication may result in
damage.
Double check wiring connections prior to powering the transmitter. Damage
from incorrect wiring connections or from too much voltage applied is not
covered under warranty.



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RDM - Operation Manual Rev. B | 2021.12
External power to the RDM must be supplied by a 24 VDC power supply or a
Class 2 (or better) transformer and connected to the Modbus® wiring terminal.
The wiring should be 4-conductor shielded 16 awg stranded within conduit in a
network wiring (daisy-chain) conguration.
Common wire colours for positive, negative and digital wires are:
• Red for positive
• Black for negative
• White for Data A
• Green for Data B
All wiring should be run within properly grounded (earth or safety) conduit.
Signal output and supply should be in shielded cable. The cable shield should
be connected to earth ground at the controller/power supply that is providing
power for the RDM.
NOTE: WARRANTY VOID IF SOLID-CORE WIRE IS USED AT THE WIRING
TERMINAL STRIP. When using solid core wiring for distribution (in the conduit),
use stranded wire pigtails 18 AWG within the enclosure to connect to the
circuit board. The rigidity of solid-core wire can pull a soldered terminal strip
completely off a circuit board and this will not be covered under
warranty.
5.6 Wiring the RDM to the FCS
The RDM can be connected to the FCS using the Modbus® LAN terminal
connection.
The read and write default RDM Modbus® ID is 230. The RDM will
automatically broadcast the display information to Modbus® ID 253. This is
the common Modbus® ID for all RDMs on the network and is used to listen for
broadcasts from the controller and receive screen updates from the controller.

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Once the RDM Remote Display is wired to the FCS, the controller needs to be
told that the RDM exists as a remote device. This is done at the controller. Refer
to the FCS Operation Manual for instructions.
Similarly, in order for the controller to communicate with the RDM, the two
devices must have the same baud rate. The factory default baud rate for all
CETCI Modbus® devices is 19,200. If you need to change the baud rate, refer to
Section 6.6 Modbus® Settings for instructions on how to set the Remote Baud
rate.
24VDC power is supplied to the RDM from the FCS. Four-conductor,
16-18 gauge wire / cable must be shielded when connecting the controller to
theRDM.
Wiring Connection for FCS and RDM

20 © 2021 All rights reserved. Data subject to change without notice.
RDM - Operation Manual Rev. B | 2021.12
6 SYSTEM OPERATION & CONFIGURATION
6.1 Navigating the Menu Structure
There are three push-button keys to the right of the display that are used to
navigate through the RDM Remote Display menu structure. To enter the menu,
press E.
After entering the menus, pressing the ARROW UP key will normally take you to
the Exit screen.
Most menus are circular and will bring you back to the Exit screen.
6.2 Accessing the Menu with Passcodes
The main menu structure is broken down by the passcode access entry. These
passcodes allow for direct access to the parts of the menu system of interest.
CODE NAME DESCRIPTION
1001 Basic
Set LCD Contrast
Set Modbus ID
Set Baud Rate
Mask Channels
Set Silence Duration
ARROW UP - used for going up through the menus or incrementing
values or selecting an alpha character
ENTER - used pirmarily as an enter key, either for getting to the next
screen or stepping through a numeric or alpha value
ARROW DOWN - used for scrolling down through the menus or
decrementing values or selecting an alpha character