Net Safety MAN-0069 User manual

4-20 mA FIRE HEAD
with
Analog/RS-485 Modbus (AD)
CONTROLLER
User Manual
Part Number: MAN-0069 Rev 2
May 2006

Net Safety Monitoring Inc
IMPORTANT INFORMATION
This manual is for informational purposes only. Although every effort has been
made to ensure the correctness of the information, technical inaccuracies may
occur and periodic changes may be made without notice. Net Safety Monitoring
Inc., assumes no responsibility for any errors contained within this manual.
If the products or procedures are used for purposes other than as described in the
manual, without receiving prior confirmation of validity or suitability, Net
Safety Monitoring Inc., does not guarantee the results and assumes no
obligation or liability.
No part of this manual may be copied, disseminated or distributed without the
express written consent of Net Safety Monitoring Inc.
Net Safety Monitoring Inc., products are carefully designed and manufactured from
high quality components and can be expected to provide many years of trouble free
service. Each product is thoroughly tested, inspected and calibrated prior to
shipment. Failures can occur which are beyond the control of the manufacturer.
Failures can be minimized by adhering to the operating and maintenance
instructions herein. Where the absolute greatest of reliability is required,
redundancy should be designed into the system.
Warranty
Net Safety Monitoring Inc., warrants its sensors against defective parts and
workmanship for a period of 24 months from date of purchase; other electronic
assemblies for 36 months from date of purchase.
No other warranties or liability, expressed or implied, will be honoured by Net
Safety Monitoring Inc.
Contact Net Safety Monitoring Inc., or an authorized representative for details.
We welcome your input at Net Safety Monitoring. If you have any comments
please contact us at the phone/address below or visit our web site and complete
our on-line customer survey: www.net-safety.com.
Contact Information
Net Safety Monitoring Inc.
2721 Hopewell Place NE
Calgary, AB
Canada
T1Y 7J7
Telephone: [phone] Fax: [phone]
www.net-safety.com
E-mail: [e-mail]
Copyright © 2004 Net Safety Monitoring Inc.
Printed in Canada

Net Safety Monitoring Inc
TABLE OF CONTENTS
Important Information
Warranty
Contact Information
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
The Product ...................................................................................................... 1
Fire Head ............................................................................................................... 1
The Controller ....................................................................................................... 1
The Manual ........................................................................................................... 1
Step 1 — Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Figure 1: Dimensional Drawings ............................................................................. 1
Step 2 — Install . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Unpack ............................................................................................................. 2
Figure 2: Components .............................................................................................. 2
Locate Controller/Fire Head ............................................................................ 2
Fire Head ............................................................................................................... 2
Controller .............................................................................................................. 2
Step 3 — Wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Field Installation .............................................................................................. 3
Seal ................................................................................................................... 3
Connecting Wires ................................................................................................. 3
Figure 3: Internal PCB Boards ................................................................................. 3
Wiring—Controller .......................................................................................... 4
RS-485 Communication ........................................................................................ 4
Figure 4: Wiring—Fire Head, Junction Box and Controller .................................... 4
Non-Isolated/Isolated Wiring .......................................................................... 5
Terminal Connection ............................................................................................. 5
Figure 5: Non-isolated Terminal Connection .......................................................... 5
Figure 6: Isolated Terminal Connection .................................................................. 5
Current Output ....................................................................................................... 5
Figure 7: Jumper Positions-Current Output ............................................................. 5
MODBUS Termination .................................................................................... 6
Figure 8: Modbus Termination Jumpers .................................................................. 6
Step 4 — Operate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 9: Controller Functionality ............................................................................7
The Main Menu ................................................................................................8
Accessing the Main Menu .....................................................................................8
Calibration Button ............................................................................................8
Magnetic Reed Switch .....................................................................................8
Main Menu Functionality ......................................................................................8
Power Up ...............................................................................................................8
Current Loop Measurement (Test Jacks) ...............................................................8
Status LED .............................................................................................................8
Select Display Language ..................................................................................9
Modbus Options ...............................................................................................9
Node Address ........................................................................................................9
Baud Rate ..............................................................................................................9
Reset .................................................................................................................9
Manual Reset .........................................................................................................9
Step 5 — Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 1: Current Output, LEDs and Display Messages .........................................10
RTU Registers ................................................................................................10
Table 2: RTU Output Register (400001) Read Only (binary) ................................10
Table 3: RTU Status Register (400002) Read Only (binary) ................................. 10
Step 6 — Maintain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
How to Return Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Face Rotation Option ......................................................................................12
Figure 10: Non-standard Orientation ......................................................................12
Rotate PCB Assembly .........................................................................................12
Figure 11: Rotate PCB Assembly ...........................................................................12
Appendix A: Electrostatic Sensitive Device (ESD) ........................13
Appendix B: Resistance Table (Ohms) ...........................................14
Appendix C: Specifications ..............................................................15

Net Safety Monitoring Inc
Modbus Controller & 4-20 Fire Head 1
INTRODUCTION
Net Safety's line of premium industrial controllers are a microcontroller based
system providing fast, accurate and continuous monitoring in extreme
environments.
THE PRODUCT
Fire Head
Net Safety’s 4-20 mA output UV/IRS, UVS, IRS, and Phoenix IR3S fire
detector heads can be used in conjunction with the Digital Controller.
The Controller
The Controller has an explosion-proof Housing, rated Class 1, Division 1,
Groups B, C, and D for hazardous applications. It was designed for either a
1-man, intrusive calibration or 2-man non-intrusive calibration.
The Manual
The manual has been designed to make installation of the product easy. To
ensure proper installation, follow the steps outlined in the following pages. If
you encounter problems during operation, consult the troubleshooting section or
contact your sales representative.
Step 1 — PLAN
Step 2 — INSTALL
Step 3 — WIRE
Step 4 — OPERATE
Step 5 — MONITOR
Step 6 — MAINTAIN
STEP 1 — PLAN
Figure 1: Dimensional Drawings
Note: Refer to the specific Fire Head manual for Fire Head dimensions.
5.5996”
2.6000”
6.84920”
4.00”
3/4” NPT 2.95”
5.00”
Junction Box
Controller
4.06”
5.28”

Net Safety Monitoring Inc.
Modbus Controller & 4-20 Fire Head 2
STEP 2 — INSTALL
UNPACK
Carefully remove all components from the packaging. Check components
against the enclosed packing list and inspect all components for obvious
damage such as broken or loose parts.
If you find any components missing or damaged, notify the representative or
Net Safety Monitoring immediately.
Figure 2: Components
Note: Refer to the specific Fire Head manual for components.
LOCATE CONTROLLER/FIRE HEAD
Fire Head
Locate Fire Heads as per the manual provided with the specific product.
Controller
The Controller should be mounted near eye-level and be easily accessible for
maintenance purposes.
Ensure all devices are securely mounted, taking into consideration all
requirements.
Controller Housing
Housing Cover
Faceplate
Use the Face Rotation Option to mount the Controller at a
different orientation (refer to "Face Rotation Option" on
page 12 for detailed instructions).

Net Safety Monitoring Inc
Modbus Controller & 4-20 Fire Head 3
STEP 3 — WIRE
FIELD INSTALLATION
WARNING:
Wiring codes and regulations may vary. Compliance with regulations is the
responsibility of the installer. Wiring must comply with applicable regulations
relating to the installation of electrical equipment in a hazardous area. If in
doubt, consult a qualified official before wiring the system.
• If the 4-20 mA output signal is not used, connect a jumper between the 4-20
terminal and the Common terminal.
• The use of shielded cable is highly recommended for signal, input, output and
power wires to protect against interference caused by extraneous electrical or
electromagnetic 'noise'.
• In applications where the wiring cable is installed in conduit, the conduit
must not be used for wiring to other electrical equipment.
• The maximum distance between the Sensor and Controller is limited by the
resistance of the connecting wiring, which is a function of the gauge of the
wire being used.
• When developing a RS-485 chain of devices, the last device in the chain
requires end of line termination.
• RS-485 connection 2-wire, multipoint serial line.
SEAL
• Water-proof and explosion-proof conduit seals are recommended to prevent
water accumulation within the enclosure.
• Seals should be located as close to the device as possible and not more than
18 inches (46 cm) away.
• Explosion-proof installations may require an additional seal where conduit
enters a non-hazardous area. Ensure conformity with local wiring codes.
• When pouring a seal, use a fibre dam to assure proper formation of the seal.
Seals should never be poured at temperatures below freezing.
• The jacket and shielding of the cable should be stripped back to permit the
seal to form around the individual wires. This will prevent air, gas and water
leakage through the inside of the shield and into the enclosure.
• It is recommended that explosion-proof drains and conduit breathers be used.
In some applications, alternate changes in temperature and barometric
pressure can cause 'breathing' which allows moist air to enter and circulate
inside the conduit. Joints in the conduit system are seldom tight enough to
prevent this 'breathing'.
Connecting Wires
1. Use a small screw driver to gently press down
and hold the spring connector open.
2. Insert appropriate wire into open connector
hole.
3. Release screw driver to secure wire.
Figure 3: Internal PCB Boards
Option Board/RS-485 Modbus RTU
Communication Board
(refer to Figure 4 for
details).
Sensor Board
(refer to Figure 4 for
details).
Terminal Board
(refer to Figure 4 for
details).

Net Safety Monitoring Inc
Modbus Controller & 4-20 Fire Head 4
WIRING—CONTROLLER
WARNING:
Power to the unit must be OFF before wiring.
1. Once the Controller’s Housing Cover is removed, connect the Fire Head to
the Junction Box, the Junction Box to the Controller and the Output
Terminals to the output signal wires.
2. Replace the Controller’s Housing Cover and turn Controller On.
3. Ensure display reads Start Delay, Status LED is Red Slow Flash and
current output displays 3.0 mA. This is the start-up delay sequence which
will last approximately 90 seconds.
Shielded copper instrument wire (minimum 18 AWG) should be used for
separations up to 500 feet. Shielded copper instrument wire (minimum
16 AWG) should be used for separations up to 2000 feet. Consult the factory if a
greater separation distance is required. Ensure the appropriate wire is used for
Class 1/Division 1 hazardous applications.
Note: If the 4-20 mA signal is not used, connect a jumper between the 4-20
terminal and the COM terminal on the Terminal Board.
RS-485 Communication
Connect devices in a chain via the Modbus terminals. The last device in the
chain requires end of line termination (refer to "MODBUS Termination" on
page 6).
Figure 4: Wiring—Fire Head, Junction Box and Controller
MVI
+24V
COM
4-20
Blu
W
Blk
Red
RST
+24V
COM
4-20
ISO
+24V
SIG
Com -
Shld
Fire Head
Input
to
Junction Box
Internal Ground
(Green Wire)
Cut Shield
Shield
Power
Terminals
Sensor
Terminals
+24V = +24V
Sig = 4-20
n/a
COM = COM
Shld
RST = Remote Reset
+24V = Power +
COM = Power -
4-20 = Current Output
ISO = +24V isolated 4-20 power
Terminals
Modbus RTU
to PLC
A
B
COM
-
Manual Vi Test Button

Net Safety Monitoring Inc
Modbus Controller & 4-20 Fire Head 5
NON-ISOLATED/ISOLATED WIRING
Terminal Connection
Figure 5: Non-isolated Terminal Connection
Figure 6: Isolated Terminal Connection
Current Output
To set an isolated current output, simply move the Jumper (shorting jack) to
either the isolated or non-isolated current position (refer to Figure 7).
Note: Unless otherwise specified, all models ship with non-Isolated current
output.
Figure 7: Jumper Positions-Current Output
RST
+24V
COM
4-20
ISO
Power
to Monitor
Supply
Terminal Board
Power Terminal Strip
RST
+24V
COM
4-20
ISO
Power
to Monitor
Supply
Terminal Board
Power Terminal Strip
Jumper—Position Jumper
(shorting jack) over pins to
set power source for current
output.
Position 3 & 2 =
Non-isolated (default)
Position 1 & 2 = Isolated
Termination Jumper—Is non-
functional in this
application. Keep in
position 3 & 2 or removed
entirely.
Terminal Board
Sensor Board

Net Safety Monitoring Inc.
Modbus Controller & 4-20 Fire Head 6
MODBUS TERMINATION
Devices are networked in a daisy chain. The device located at the end of the
chain requires end of line termination. Place both jumpers over the pins, as
shown in Figure 8, for end of line termination.
Figure 8: Modbus Termination Jumpers

Net Safety Monitoring Inc.
Modbus Controller & 4-20 Fire Head 7
STEP 4 — OPERATE
The Controller faceplate contains most functional elements of the user interface. Below is a description of that functionality.
Figure 9: Controller Functionality
* Fire Heads do not require calibration. The button is used for reset and setup.
Status
Red
Slow Flash:
Gas present
Flast flash :
Cal or Fault
Solid:
Overrange
Pull
Here
Green
Short Blips:
Normal
operation.
No gas
present
Cal/Reset
Magnet
OnSide
Off
Power
On
Pull
Here
Current O/P Check
Connect current probes
to meter jacks and
read mA output
Calibration/Setup
-Hold Cal/Reset or
magnet until countdown
is zero (~10 sec)
-Follow instruction on
display
Magnetic Reed Switch - provides non-intrusive access for
programming and resetting.
-Place magnet against Housing (where indicated) for less than one
second to initiate a basic system reset (clear a latched alarm) and
make selections.
-Place magnet against Housing (where
indicated) and hold to program and view
current settings.
Refer to "Magnetic Reed Switch" on page 8
for further information.
Scrolling 8-character display -
provides various status messages and
prompts. Refer to Table 4, "Current
Output, LEDs and Display
Messages", on page 10.
Pull Here knob - unscrew the two
screws and gently pull to remove
faceplate. Removal allows access
to the PCB boards. The faceplate
remains attached by the ribbon
cable.
Status Light (Red and Green) -
indicates status of unit. Refer to
Table 4, "Current Output, LEDs and
Display Messages", on page 10 for
detailed explanation of states/status.
Current Test Jacks - to take current loop measurements use the following procedure:
-Insert your current meter leads into the Test Jacks.
-Set external devices to bypass, if necessary, to avoid unwanted alarm response
-Review current loop measurements.
Refer to "Current Loop Measurement (Test Jacks)" on page 8 and Table 4, "Current Output, LEDs and
Display Messages", on page 10.
Calibration Button* - provides intrusive
access for programming and resetting.
-Push for less than one second to initiate a
basic system reset (clear a latched alarm)
and make selections.
-Push and hold to program and view
settings.
Refer to "Calibration Button" on page 8 for
further information.
ON/OFF Switch - used to turn Controller on and
off. Housing must be removed to access.
Pull Here knob - unscrew the two screws
and pull to remove faceplate. Removal
allows access to the PCB boards. The
faceplate remains attached by the ribbon
cable.

Net Safety Monitoring Inc
Modbus Controller & 4-20 Fire Head 8
THE MAIN MENU
The Main Menu allows for:
• Modbus Setup - Select Node Address and Baud Rate
• Select a display language - English, Spanish or French
Note: The current output will drop to 3.0 mA while in the Main Menu.
Accessing the Main Menu
There are two ways to activate the Main Menu:
• Calibration Button found on the faceplate (the Housing cover must be
removed to access)
• Magnetic Reed Switch (a magnet must be used to activate)
Calibration Button
The Calibration Button provides access to the Main Menu, which allows options
to be reviewed and set. Refer to Figure 9 for more information.
•Press and hold the Calibration Button to access Main Menu.
•Briefly press to make a selection (select YES?).
WARNING:
Opening the Controller’s Housing should be avoided when the presence of gas
is possible (when in a hazardous environment). Do not power up the system,
with the Housing removed, unless the area has been de-classified.
Magnetic Reed Switch
The Magnetic Reed Switch is provided to avoid opening the Housing in an
environment where gas may be present. The Magnetic Reed Switch functions in
the same manner as the Calibration Button but in a non-intrusive manner. Refer
to Figure 9 for more information.
Attached to the side of the Controller is a magnet:
•Place and hold the magnet to the Controller’s Housing (10 o’clock position)
to access Main Menu.
•Briefly place the magnet to the Controller’s Housing (10 o’clock position) to
make a selection (select YES?).
Main Menu Functionality
1. Ensure that the Controller has been turned on and no fault is present.
2. Hold the magnet against the Reed Switch or press and hold the Calibration
Button until the message Switch On displays and the countdown (10 to
0) finishes.
3. An option will scroll across the display followed by the prompt YES?.
4. To select an option, momentarily place the magnet to the Reed Switch or
press the Calibration Button at the YES? prompt.
5. If you do not wish to select that option wait until the next option appears
and then select YES?.
6. A selection is acknowledged with a flashing YES.
7. If no option is selected, the Controller returns to normal operation.
Power Up
Turn power switch On. A 90 second warm-up routine will begin. The display
shows Start Delay Millennium Net Safety, the Status LED is Red
Slow Flash and current output displays 3.0 mA.
When power is applied, the system is automatically tested to ensure proper
functionality.
After warm-up, the Controller will enter normal operation, the display reads
NORM, Status LED will Green Blip/blink and analog output will change to
4.0 mA.
Current Loop Measurement (Test Jacks)
Use a standard meter to measure current loop during various states. The
Controller’s Housing cover must be removed to access the Test Jacks.
Refer to Table 4, “Current Output, LEDs and Display Messages,” on page 10
for a detailed list and Figure 9 for more information.
Status LED
The Status LED will remain solid, flash, blip and/or blink, in either Red or
Green, to indicate various states. Refer to Table 4, “Current Output, LEDs and
Display Messages,” on page 10 for a detailed list.

Net Safety Monitoring Inc
Modbus Controller & 4-20 Fire Head 9
SELECT DISPLAY LANGUAGE
Step 1: Wait for Select Display Language YES? to display. Press
the Calibration Button or use the Reed Switch to select.
The flashing YES confirms the selection.
Step 2: When the required language displays (English, Espanol,
Francais) press the Calibration Button or use the Reed Switch to
select.
The flashing YES confirms the selection.
Note: Factory default is English.
MODBUS OPTIONS
The digital RS-485 Modbus RTU protocol is used. There are two Modbus
options: Node Address and Baud Rate.
Note: When a modbus option is changed, the message BUSY will display for a
few seconds while the unit is updated.
Node Address
Each device connected to the chain must be assigned a unique node address.
The last number of the address is selected first.
Step 1: When Modbus Setup? YES? displays press the Calibration
Button or use the Reed Switch to select.
The flashing YES confirms the selection.
Step 2: The current node address will display Node: 000.
Step 3: Wait for the prompt New Address? YES? and press the
Calibration Button or use the Reed Switch to select.
Step 4: Use the Calibration Button or Reed Switch to select each of three
numbers in the new address:
- select the last number in the address first: 0thru 9.
- select the next number in the address: 0thru 9.
- select the first number in the address last: 0 1 2.
Baud Rate
The transmission speed must be defined.
Step 1: When Modbus Setup? YES? displays press the Calibration
Button or use the Reed Switch to select.
The flashing YES confirms the selection.
Step 2: After setting the Node Address, the current Baud Rate will display
XX.X BPS.
Step 3: Wait for the prompt New Baud Rate? YES? and press the
Calibration Button or use the Reed Switch to select.
Step 4: The available baud rates will display: 2400s, 4800s, 9600s,
14.4s, 19.2s, 28.8s, 38.4s, 57.6s.
Step 5: Use the Calibration Button or use the Reed Switch to select baud
rate when it displays.
Step 6: The flashing YES confirms the selection.
RESET
Manual Reset
A Manual Reset may be required to clear a latched relay alarm. Simply place
and hold the magnet against the Reed Switch or press and hold the Calibration
Button for 3-5 seconds. The unit will return to normal operation.

Net Safety Monitoring Inc
Modbus Controller & 4-20 Fire Head 10
STEP 5 — MONITOR
There are a variety of ways to indicate the status of the connected detectors:
current output, LEDs and Display Messages.
Table 4: Current Output, LEDs and Display Messages
RTU REGISTERS
Register 40001 = RTU Output (read only)
Register 40002 = RTU Status (read only)
Register 40101 = Reset latched relays (write)
Note: Many registers are used by the controller. Please do not write outside
the three registers.
LED Status Current
O/P
Status LED
(red) (green) Display Messages
Internal Power Fault or
system power out of range 1.0 mA Fast Flash -
Sensor Fault
Automatic or manual VI
Test Failure 2.0 mA Fast Flash -
VI Fault
Start Delay (90 seconds) 3.0 mA Blip -
Start Delay
Millennium
Normal Operation 4.0 mA - Blip
NORM
Background radiation
source UV 6.0 mA Flash -
UV Present
Background radiation
source IR 8.0 mA Flash -
IR Present
Early Warning -
Intermittent radiation
detected
16.0 mA Flash -
Warning!!
Fire confirmed 20.0 mA Flash -
FIRE (flashes)
Writing to memory - - Solid
BUSY
Table 5: RTU Output Register (40001) Read Only (binary)
RTUfire_power_up 0x0001 power up delay
RTUfire_vi_fault 0x0002 failed self test
RTUfire_normal 0x0004 normal operation
RTUfire_fault 0x0008 fire head fault
RTUfire_ir_present 0x0010 background IR
RTUfire_uv_present 0x0020 background UV
RTUfire_warning 0x0040 Warning Fire
RTUfire_alarm 0x0080 Fire present
Table 6: RTU Status Register (40002) Read Only (binary)
RTUstat_fault 0x0001 fault (sensor...)
RTUstat_mem_error 0x4000 memory error

Net Safety Monitoring Inc
Modbus Controller & 4-20 Fire Head 11
STEP 6 — MAINTAIN
The Controller on its own requires no maintenance. Refer to the Maintenance
Section of the specific Fire Head manual for Fire Head maintenance and testing
procedures.
HOW TO RETURN EQUIPMENT
A Material Return Authorization number is required in order to return
equipment. Please contact Net Safety Monitoring at [phone] before
returning equipment or consult our Service Department to possibly avoid
returning equipment.
If you are required to return equipment, include the following information:
1. A Material Return Authorization number (provided over the phone to you
by Net Safety).
2. A detailed description of the problem. The more specific you are regarding
the problem, the quicker our Service department can determine and correct
the problem.
3. A company name, contact name and telephone number.
4. A Purchase Order, from your company, authorizing repairs or request for
quote.
5. Ship all equipment, prepaid to:
Net Safety Monitoring Inc
2721 Hopewell Place N. E.
Calgary, Alberta, Canada
T1Y 7J7
6. Mark all packages: RETURN for REPAIR
Waybills, for shipments from outside Canada, must state:
Equipment being returned for repair
All charges to be billed to the sender
Also, please ensure a duplicate copy of the packing slip is enclosed inside the
box indicating item 1-4 along with the courier and account number for returning
the goods.
All Equipment must be Shipped prepaid. Collect shipments will not be
accepted.
Pack items to protect them from damage and use anti-static bags or aluminum-
backed cardboard as protection from electrostatic discharge.

Net Safety Monitoring Inc
Modbus Controller & 4-20 Fire Head 12
FACE ROTATION OPTION
In some applications, it is necessary for the Controller to be mounted in a non-
standard orientation. To accommodate such installations and ensure that the
display will appear at the correct angle for viewing, the PCB Assembly can be
rotated inside the Controller.
Figure 10: Non-standard Orientation
Note: Ensure orientation allows for connections and excess wire within Controller
Housing.
WARNING: See Appendix D, "Electrostatic Sensitive Device (ESD)", on
page 13 for handling instructions of electronic components.
Rotate PCB Assembly
1. Remove the Controller’s Housing Cover.
2. Turn the power to the detector off.
3. Unscrew both the knobs marked "Pull Here".
4. Lift Controller faceplate from Housing and allow to hang from ribbon
cable.
5. Unscrew the two metal standoffs.
6. Carefully remove the PCB Assembly from the Housing.
7. The Rotator plate is secured to the bottom of the Housing and is accessible
after the PCB Assembly has been removed.
8. Rotate the PCB Assembly to desired position and line up the standoffs with
the mounting holes.
9. Insert standoffs in the appropriate horizontal or vertical mounting holes.
10. Tighten standoffs to secure PCB Assembly.
11. Replace faceplate and tighten "Pull Here" knobs.
12. Return power to detector and replace Housing Cover.
Figure 11: Rotate PCB Assembly
Standoffs
PCB Assembly Faceplate
Ribbon cable
Vertical Mounting Holes
(Insert Standoffs)
Horizontal Mounting
(Insert Standoffs)
Holes

Net Safety Monitoring Inc
Modbus Controller & 4-20 Fire Head 13
Appendix D: ELECTROSTATIC SENSITIVE DEVICE (ESD)
Electrostatic discharge (ESD) is the transfer, between bodies, of an electrostatic
charge caused by direct contact or induced by an electrostatic field.
The most common cause of ESD is physical contact. Touching an object can
cause a discharge of electrostatic energy—ESD! If the charge is sufficient and
occurs near electronic components, it can damage or destroy those components.
In some cases, damage is instantaneous and an immediate malfunction occurs.
However, symptoms are not always immediate—performance may be marginal
or seemingly normal for an indefinite period of time, followed by a sudden
failure.
To eliminate potential ESD damage, review the following guidelines:
• Handle boards by metal shields—taking care not to touch electronic
components
• Wear grounded wrist or foot straps, or ESD shoes or heel grounders to
dissipate unwanted static energy
• Prior to handling boards, dispel any charge in your body or equipment
• Ensure components are transported and stored in static safe packaging
• When returning boards, carefully package in the original carton and static
protective wrapping
• Ensure ALL personnel are educated and trained in ESD Control Procedures
In general, exercise accepted and proven precautions normally observed when
handling electrostatic sensitive devices.
A warning label is placed on the packaging, identifying product using
electrostatic sensitive semiconductor devices.

Net Safety Monitoring Inc
Modbus Controller & 4-20 Fire Head 14
Appendix E: RESISTANCE TABLE (OHMS)
Note: Resistance shown is one way. This figure should be doubled when determining closed loop resistance.
Distance (Feet) AWG #20 AWG #18 AWG #16 AWG #14 AWG #12 AWG #10 AWG #8
100 1.020.640.400.250.160.100.06
200 2.031.280.800.510.320.200.13
300 3.051.921.200.760.480.300.19
400 4.062.551.611.010.640.400.25
500 5.083.202.011.260.790.500.31
600 6.093.832.411.520.950.600.38
700 7.11 4.47 2.81 1.77 1.11 0.70 0.44
800 8.12 5.11 3.21 2.02 1.27 0.80 0.50
900 9.145.753.612.271.430.900.57
1000 10.20 6.39 4.02 2.53 1.59 1.09 0.63
1250 12.70 7.99 5.03 3.16 1.99 1.25 0.79
1500 15.20 9.58 6.02 3.79 2.38 1.50 0.94
1750 17.80 11.20 7.03 4.42 2.78 1.75 1.10
2000 20.30 12.80 8.03 5.05 3.18 2.00 1.26
2250 22.80 14.40 9.03 5.68 3.57 2.25 1.41
2500 25.40 16.00 10.00 6.31 3.97 2.50 1.57
3000 30.50 19.20 12.00 7.58 4.76 3.00 1.88
3500 35.50 22.40 14.10 8.84 5.56 3.50 2.21
4000 40.60 25.50 16.10 10.00 6.35 4.00 2.51
4500 45.70 28.70 18.10 11.40 7.15 4.50 2.82
5000 50.10 32.00 20.10 12.60 7.94 5.00 3.14
5500 55.80 35.10 22.10 13.91 8.73 5.50 3.46
6000 61.00 38.30 24.10 15.20 9.53 6.00 3.77
6500 66.00 41.50 26.10 16.40 10.30 6.50 4.08
7000 71.10 44.70 28.10 17.70 11.10 7.00 4.40
7500 76.10 47.90 30.10 19.00 12.00 7.49 4.71
8000 81.20 51.10 23.10 20.20 12.70 7.99 5.03
9000 91.40 57.50 36.10 22.70 14.30 8.99 5.65
10 000 102.00 63.90 40.20 25.30 15.90 9.99 6.28

Net Safety Monitoring Inc.
Modbus Controller & 4-20 Fire Head 15
Appendix F: SPECIFICATIONS
CONTROLLER SPECIFICATION
Note: Units are factory sealed.
Controller 4-20 mA ANALOG OUTPUT RS-485 MODBUS OUTPUT
Operating Temperature Range -40°C to +85°C (-40F to +185F)
Fire Head Power Consumption
@ 24 V dc
Nominal 170 mA / 4.08 W
Maximum 230 mA / 5.52 W
Humidity Range 0 to 100% relative humidity, non-condensing
Operating Voltage Range 10.5 to 32.0 V dc at units power terminals
Enclosure Material Powder coated Copper Free Cast Aluminum
Certifications
CSA and NRTL/C certified for hazardous locations. Class I, Division 1, Groups B, C and D.
Temperature T5.
IEC Rating Ex d IIB+H2 T5 (Class1, Zone 1, Group 11B+H2 T5). Maximum operating ambient of 85°C.
Enclosure Type 4X.
Note: Electronics only-CSA and NRTL/C certified for hazardous locations Class I, Division 2
Groups A, B, C and D.
Weight 3.2 Kg (7.0 lb)
Current Output
4 to 20 mA - Into a maximum loop impedance of 800
Ohms at 32 V dc or 150 Ohms at 10.5 V dc. Isolated
or non-isolated loop supply. --
Digital Output -- Digital RS-485 Modbus RTU Protocol

N
et Safety Monitoring Inc.,
2
721 Hopewell Place NE
C
algary, Alberta, Canada T1Y 7J7
T
elephone: [phone] Fax: [phone]
E
-mail: [e-mail]
w
ww.netsafety.com
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