Macurco DVP-120B User manual

Macurco DVP-120B
Detection and Ventilation Control Panel
User Instructions
IMPORTANT: Keep these User Instructions for reference.

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Table of Contents
1General Safety Information..........................................................................................................................................................4
1.1 List of warnings.....................................................................................................................................................................4
2Use Instructions and Limitations..................................................................................................................................................5
2.1 DVP-120B General Description............................................................................................................................................5
2.2 DVP-485B Modbus®Adapter................................................................................................................................................5
2.3 MRS-485 Modbus Adapter...................................................................................................................................................5
2.4Features...............................................................................................................................................................................6
2.5 Specifications........................................................................................................................................................................6
3Installation and Operating Instructions.........................................................................................................................................7
3.1 Mounting Holes.....................................................................................................................................................................7
3.2 General Wiring Information...................................................................................................................................................8
3.2.1 DVP-120.....................................................................................................................................................8
3.2.2 DVP-120B...................................................................................................................................................8
3.3 Main Power Connection........................................................................................................................................................9
3.4 Remote Sensor Connection..................................................................................................................................................9
3.4.1 DVP-120.....................................................................................................................................................9
3.4.2 DVP-120B.................................................................................................................................................11
3.5 Interfacing Macurco Sensors..............................................................................................................................................13
3.5.1 DVP-120...................................................................................................................................................13
3.5.2 DVP-120B.................................................................................................................................................13
4Operations.................................................................................................................................................................................18
4.1 Initial Operating Mode.........................................................................................................................................................18
4.1.1 Status Light Display..................................................................................................................................18
4.1.2 User Interface...........................................................................................................................................19
4.1.3 Cursor Keys..............................................................................................................................................19
4.1.4 MENU Key................................................................................................................................................19
4.1.5 HUSH Key.................................................................................................................................................19
4.1.6 Normal Status Display..............................................................................................................................20
4.1.7 ALARM Status Display..............................................................................................................................20
4.1.8 Warning Status Display.............................................................................................................................21
4.1.9 Trouble Status Display..............................................................................................................................21
4.2 Ventilation Control..............................................................................................................................................................22
4.2.1 Zone Signal Display..................................................................................................................................22
4.3Setting the System Configuration.......................................................................................................................................23
4.3.1 System Menu............................................................................................................................................23
4.3.2 Configure System Submenu.....................................................................................................................24
4.3.3 Configure Sensors Submenu....................................................................................................................29
4.3.4 Configure Relays, Horn & Strobe Submenu .............................................................................................31
4.3.5 Configure Horn Submenu.........................................................................................................................32
4.3.6 Configure Strobe Submenu.......................................................................................................................33
4.3.7 Configure Zones Submenu.......................................................................................................................33
4.3.8 Configure Signals Submenu.....................................................................................................................37
5BACnet ......................................................................................................................................................................................41
5.1 General Information............................................................................................................................................................41
5.1.1 Analog Input - Sensor ID...........................................................................................................................41
5.1.2 Analog Input - Gas Reading......................................................................................................................41
5.1.3 Binary Input - MRS Trouble.......................................................................................................................41
5.1.4 Binary Input - Over Range........................................................................................................................41
5.1.5 Binary Input – Trouble...............................................................................................................................41
5.1.6 Binary Input- DVP Com Error....................................................................................................................41
5.2 Macurco Network Parameter Utility (NPU).........................................................................................................................41
5.3 BACnet Connection............................................................................................................................................................43
5.3.1 Serial RS-485 to USB Wiring....................................................................................................................43
5.3.2 Serial RS-485 to Ethernet (TCP/IP)..........................................................................................................44

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5.4 BACnet software.................................................................................................................................................................44
6Troubleshooting.........................................................................................................................................................................45
6.1 System Status Light Flashing.............................................................................................................................................45
6.1.1 Input Channel Trouble..............................................................................................................................45
6.1.2 Internal Controller Board Trouble..............................................................................................................46
6.2 Timed ventilation problem...................................................................................................................................................46
6.3 No Power............................................................................................................................................................................46
6.4 LCD Display unreadable.....................................................................................................................................................46
6.5 The Keypad does not respond (LCDshows KEYS LOCKED)............................................................................................46
6.6 The Keypad does not respond after silencing an Alarm, Warning or Trouble.....................................................................47
6.7 After a power failure............................................................................................................................................................47
6.8MRS-485 Modbus Application............................................................................................................................................47
6.8.1 Normal Operation......................................................................................................................................47
6.8.2 Unknown Sensor Code.............................................................................................................................47
6.8.3 Error Codes...............................................................................................................................................47
6.8.4 Dip Switch Settings Codes........................................................................................................................47
7Testing and Maintenance...........................................................................................................................................................49
7.1 Testing................................................................................................................................................................................49
7.1.1 Keypad Test..............................................................................................................................................49
7.1.2 DVP Functionality Test.............................................................................................................................49
7.2 Maintenance.......................................................................................................................................................................49
8Appendix A – Quick Setup.........................................................................................................................................................50
8.1 Configure System Submenu...............................................................................................................................................52
8.2 Configure Sensors Submenu..............................................................................................................................................54
8.2.1 See section 4.1 Initial Operating Mode for more detail.............................................................................54
8.2.2 See section 4.1.2 User Interface for more detail.......................................................................................54
8.2.3 See section 4.3 Setting the System Configuration formore detail............................................................54
8.2.4 See section 4.3.3 Configure Sensors Submenu for more detail...............................................................54
8.3 Configure Relays, Horn & Strobe Submenu.......................................................................................................................55
8.3.1 See section 4.3.4 Configure Relays, Horn & Strobe Submenu for moredetail.........................................55
8.4 Configure Zones Submenu.................................................................................................................................................56
8.4.1 See section 4.3.7 Configure Zones Submenu for more detail...................................................................56
8.5 Configure Signals Submenu...............................................................................................................................................58
8.5.1 See section 4.3.8 Configure Signals Submenu for more detail.................................................................58
9Appendix B – DVP-120 Setup Record.......................................................................................................................................59
10 Appendix C – DVP-120B Setup Record ....................................................................................................................................60
11 Macurco Gas Detection products limited warranty.....................................................................................................................62
Technical Support Contact Information.............................................................................................................................................62
General Contact Information.............................................................................................................................................................62

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1 General Safety Information
1.1 List of warnings
WARNING
•Each person using this equipment must read and understand the information in these User Instructions before use. Use of this
equipment by untrained or unqualified personsor use that is not in accordance with theseUser Instructions, may adversely
affect product performance and result in serious injury or death.
•This equipment helps monitor for the presence and concentration level of certainspecified airbornegases. Misuse may
produce an inaccurate reading, which meansthat higher levels of the gas being monitoredmay be present and could result in
overexposure and result in serious injury or death. For proper use,see supervisor or User Instructions, orcall Macurco
Technical Service at 1-844-325-3050.
•DVP-120B may not functioneffectively below 32°F (0°C) orabove 104°F (40°C). Using the equipment outside of this
temperature range may adversely affectproduct performance and result in serious injury or death.
•High voltage terminals (120/240 VAC)are located within the DVP-120B, presenting a hazard to service technicians. Only
qualified technicians shouldopen the DVP-120B case and service the internal circuits. Ensure power is removed from the
DVP-120B prior to servicing the unit.
•Immediately exit any environment that causes an alarm condition on the sensor. Failure to do so may result in serious injury
or death.
•Each time theunit is turned on it performs a self-test, which activates the audibleand visual alarms. If theself-test fails, or all
the alarms do not activate, do not use. Failure to do somay adversely affect product performance and result in serious
injury or death.
•Do not cover or obstruct audible alarm opening or visual alarm LED. Doing so may adversely affect product performance and
result in serious injury or death.
•Do not disassemble unitor attempt to repair ormodify any component of this instrument.This instrumentcontains no user
serviceable parts, and substitution of components may adversely affectproduct performance and result in serious injury or
death.
•Use only for monitoring the gases which thesensors and equipment are designed to monitor. Failure to doso may resultin
exposures to gases not detectable and result in serious injury or death. For proper use, see supervisor or User Instructions,
or call Macurco Technical Support at 1-844-325-3050.

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2 Use Instructions and Limitations
2.1 DVP-120B General Description
The DVP-120B exhaust fan controller, use in conjunction with Macurco gas detector,controller, transducers, providesautomatic
controls to helpmaintain an acceptable environmentin parking garages or other facilities. The DVP-120B system is designed to meet
specifications for safety in enclosed parking garages, including the Uniform Building Code and OSHA 50ppm CO requirements. The
standard DVP-120B can control up to twelve analog gas sensors, as well as 87 digital addressable sensors, in any combination (i.e.
CO, NO2, EX, etc.). The DVP-120B is ready for operation after the wiring is complete and the user systemconfiguration is entered.
2.2 DVP-485B Modbus®Adapter
TheDVP-485BModbus adapterincreases thecapacityofthe DVP-120Bfrom 12detectorsto 99and providesaRS-485BACnetoutput.
The DVP-120B is the Modbus and BACnet enabled version of the DVP-120 with up to 87 Modbus addressable sensors on one channel,
plus the original 12 analog 4-20mA sensor channels. System wiring includes 4-20mA current loop and RS-485 serial detector interface
aswellasmain powerconnectionforthe DVP-120B,thefancontroland alarmconnectionsfromtheDVP-120Btothebuildingventilation
andautomationsystems.TheRS-485serialinterfaceisfromtheDVP-120Btotheremotedetectors.Powertothesedetectorsisprovided
by an external 24VDC low voltage power supply. See section 3.4 Remote Sensor Connection for more information regarding remote
power supplies.
2.3 MRS-485 Modbus Adapter
The Macurco MRS-485 adapter is an accessory used to convert the 4-20mA analog signal from Macurco 6-Series type detectors to a
digital signal for use with the DVP-120B and other multipoint addressablesystems. The Macurco MRS-485 simply plugs into the back of
the detector and a single screw fastens it in place. The MRS-485 accepts the 4-20mA output and is powered from the same connection
as the detector. The MRS-485 mounts to a Macurco 6-Series detector installed on a 4” x 4” electrical box electrical box supplied by the
contractor.
WARNING
EachpersonusingthisequipmentmustreadandunderstandtheinformationintheseUserInstructionsbeforeuse.Useofthisequipment
by untrained or unqualified persons or use that is not in accordance with these User Instructions, may adversely affect product
performance and result in serious injury or death.

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2.4 Features
•LCD display showing the status ofeach transducer andrelay
•External keypad for user selection ofthe transducer/alarm display andsetting the configuration (password
protected)
•Up to three ventilation control zones can bedefined
•Each zone can be controlled based ontransducer signals and/or time of day
•Each relay isconfigurable with adelay before activation and minimum ontime
•Fail-safe operation can beimplemented
•Lockable NEMA 1 type enclosure
•Modular input and output connectors
•One RS-485 digital input channels - 87 addressable sensors RS-485 digital output channel for BACnet
•Compatible with all Macurco 6-Series gas detectors and MRS-485 adapter
•Twelve analogs (current loop) input channels
•Three 10A, 240 VAC SPDT Dry Contact relays
•24VDC Powered Relays for external Horn and Strobe
•ETL Listed toUL508A, CAN/CSA-C22.2 No. 14-13
•BTL Listed
2.5 Specifications
•Size: 10.5” x 12.5” x2.” (267 mm x 318 mm x 51 mm)
•Weight: 6 ½ lb (2.9 kg)
•Enclosure: NEMA 1 Type
•Operating Temperature: 32° to 104°F (0° to 40°C)
•Operating Humidity: 0% to 95% RH non-condensing
•Power Input: 90 – 250 VAC, 1 Amp, 47 – 63 Hz, single phase
•Relay Rating (3): SPDT, 120/240 VAC, 10 A resistive
•LCD Display: 2 rows of 16 characters with backlight
•Status Indicators (LED): Power, ALARM/warning, Hush, Relay 1, Relay2 & Relay 3
•Audible indicator: Internal buzzer, 90 dBA at 1ft
•External Drivers (2): 24VDC, maximum 250 mA
•Carbon Monoxide (CO) Range: 0 – 200ppm
•Nitrogen Dioxide (NO2) Range: 0 – 20ppm
•Combustible (EX) Range: 0 – 50% LEL
•Ammonia (NH3) Range: 0 – 100ppm
•Hydrogen Sulfide (H2S) Range: 0 – 50ppm
•Refrigerant (REF) Range: 0 – 1,000ppm
•Oxygen (O2) Range: 0 – 25% v/v
•Carbon Dioxide (CO2) Range: 0 – 5,000ppm
•Wild Card (WC) Range: Variable
•Relay on Delay: 0 – 15 minutes in1 second increments
•Relay Minimum Run Time: 0 – 15 minutes in1 second increments

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3 Installation and Operating Instructions
Gas detection and exhaust fan control are provided by a Macurco DVP-120 system. System wiring includes the main power connection
for the DVP-120, 4-20mA current loop and 24VDC power connections between the remote sensors and the DVP-120, the fan control
connectionsand/oralarmconnectionsfromtheDVP-120tothebuildingventilationandautomationsystems.TheDVP-120Balsoincludes
the RS-485 serial interface from the DVP-120B to the MRS-485 and remote detectors. Power to the MRS-485 and detectors is provided
by isolated/remote low voltage power supply.
The system is configured bythe user through the LCD display and keypad. Thesystem display providesthe userwith the system status
and the status of each configured sensor. In addition, all control functions of the DVP-120 may be accessed through thesystem display
and keypad.
WARNING
This equipment helps monitor for the presence and concentration level of certain specified airborne gases. Misuse may produce an
inaccurate reading, which means that higher levels of the gas being monitored may be present and could result in overexposure and
result in serious injury or death. For proper use, see supervisor or User Instructions, or call Macurco Technical Service at 1-844-325-
3050.
This DVP-120 system shouldbe used with Macurco™transducers and each unit will measure the level of the target gas (i.e. CO, NO2,
EX, etc.) and provide this information to the DVP-120 over a 4-20mA current loop. The transducers operate on low voltage (24VDC). All
powerand signalconnectionsforthe transducersareprovidedfromthe DVP-120controlpanel, viaunshieldedfourconductor cable.For
DVP-120B Modbus applications use shielded 3-conductor wire with one twisted pair providing a pair for signal (A & B), common (COM)
and shield ground (SHD) connections. The DVP-120 controlpanel provides three relays which can be used for ventilation fan control or
alarm signaling. These relays (SPDT - Form C) are for pilot duty only, capable of switching 10 amp loads up to 240 VAC. Main power
wiring should conform to national and local electrical codes and may require separate inspections and certification. Contact your local
building authority for further details.
WARNING
DVP-120 may not function effectively below32°F (0°C) or above 104°F (40°C). Using theequipment outside of this temperature range
may adverselyaffect product performance and result in serious injury or death.
3.1 Mounting Holes
Mounting holes are provided in the DVP-120 case at the four corners. The top two are keyhole shaped so that the panel can be hung
and then the two bottom screws driven to hold the panel. See figure 3-1. The panel should be mounted with sufficient space around the
panel for access to Conduit entry holes provided on the top,bottom and right side of the panel.
Figure 3-1 Mounting Holes

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3.2 General Wiring Information
WARNING
High voltage terminals (120/240 VAC) are located within the DVP-120, presenting a hazard to service technicians. Only qualified
techniciansshouldopentheDVP-120caseandservicetheinternalcircuits.EnsurepowerisremovedfromtheDVP-120priortoservicing
the unit.
Figure 3-2 Typical Layout
With the exception of the safety ground, all field wiring is completed via modular connectors (provided). After wiring, simply plug the
modular connectors into thematching connectors on the printed circuitboard (PCB).
Note: It is recommended to always install with wires enclosed within the rigid metallic conduit.
3.2.1 DVP-120
The power and signal connections to the remotely mounted sensors should be size AWG18 (minimum) for short runs. Refer to Table 3-
2 for recommended wire gauges. Four conductor cables may be used in all cases since the DVP-120 employs DC power for remote
sensors to help prevent electrical noise from interfering with the sensor output signal.
Do not bundle sensor power and/or signal connections with other AC power cables to prevent electrical interference. If other AC power
connections must be bundled with the DVP-120 sensor cables, the sensor connections should be made with two twisted pairs of the
appropriate gauge, with an overall foil and braid shield. All shields shouldbe terminated at the DVP-120 end of the cable only. A ground
stud is providednear the bottom leftcorner of the panel.
3.2.2 DVP-120B
The power connections to the MRS-485 and remote mounted sensors and should be size AWG18 (minimum) for short runs. Refer to
Table 3-2a for recommended wire gauges. The power for the MRS-485 adapter is connected via a two-terminal screw type connector,
12 to 24 VAC or 12 to 24 VDC and no polarity.
The MRS-485 adapter output is wired in the standard 2W-Modbus circuit definition with selectable built-in terminating resistors at the
ends of the RS-485 bus. It is recommended to always use twisted wires to reduce noise and allow for reliabledatacommunicationover
greater distances. For best performance use shielded 3-conductor wire with one twisted pair providing a pair for signal (A & B), common
(COM) and shield ground (SHD) connections. Use at least 3-conductor wire with one twisted pair providing a pair for signal (A & B) and
common (COM) connections. The Macurco MRS-485 Modbus output is connected via a four-terminal screw type connector.
Running the Modbus cable adjacent toor in the same conduit with high voltage wires is not recommended as there may be interference
from the high voltages.

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3.3 Main Power Connection
Themain powercableshouldbe routedintothe bottomleftconduitentry. Macurcorecommendsa minimumwire sizeof AWG18and the
wire insulator must be rated for 140°F (60°C) service. The modular connector will accept wire from 12 to 24 AWG. The safety ground
wire should be secured to the ground stud at the bottom left of thecabinet with the lock washer and nut supplied. Use a ring terminalfor
the ground connection. Refer to Table 3-1 for DVP-120 power connections. The line and neutral wires should be stripped 1/4 in. (6.5
mm), insert the wire into the wire cavity of the modular connector and tighten the screw clamp. Ensure that the wire cannot be easily
pulled from the connector. Plug the modularconnector into AC~ on the PCB and ensure that it latches into theheader properly.
Signal
Connector
Pin Number
Line (120/220/240/250 VAC)
AC~
3
Neutral
AC~
1
Ground
Ground Stud
n/a
Table 3-1 Main Power Connections
Figure 3-3 System Wiring Diagram
3.4 Remote Sensor Connection
3.4.1 DVP-120
Each remote sensor is connected by a four-wire connection – two wires forDC power andtwo wires for the 4– 20 mA loop connection.
The sensors are connected to the control panel PCB with modular connectors, two sensors per connector. See Figure 3-5 for a view of
a typical sensor connector. Refer to Table 3-2 for wire size recommendations.

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Figure 3-4 DVP-120 Internal View and DVP-120B with DVP-485 Modbus Adapter
Figure 3-5 Sensor Interface Connector – Channels 5 and 6
Each 8-terminal sensor modular connector may be disconnected from the PCB connector to ease wire installation. The terminals will
accept wire from 16 to 28 AWG. To install a wire, strip back approximately 0.25 in. (6 mm) of insulation and insert the bare wire into the
terminal. Tighten thescrew clamp and ensure that the wirecannot be easily pulled from the connector. Connector to sensor C1 through
C12 correspondence to all 12 input channels.
Wire gauge
Maximum Run Length
(feet)
(meters)
18
500
152
16
800
244
14
1250
381
Table 3-2 Recommended Wire Gauge

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Typical coverage for CO, CO2and NO2sensorsis 5,000 sq. ft. (464.5sq. m), 900 sq. ft. (83.6 sq. m) for combustiblesand other toxic
gases (see the User Instructions for eachsensor type for location and coveragedetails). Extra sensors may be needed nearareas
where people work, such as toll booths.Macurco provides only the control panels and sensors. Fans, relays, and other devices are
provided by the contractor. See the appropriate building code for thesize of fans and air changes per unit of time.
3.4.2 DVP-120B
A Modbus over Serial Line Cable should be shielded for best performance. The shield should be connected on each detector at SHD
terminal and connected to a ground terminal or chassis only at one end of the bus. An RS485-MODBUS must use a balanced pair (for
A-B) and a third wire (for the Common). For RS485-MODBUS, Wire Gauge must be chosen sufficiently wide to permit the maximum
length (1000 m or 3281ft). AWG 24 is always sufficient for the MODBUS Data. Category 5 cables may operate for RS485-MODBUS, to
a maximum length of 600 m 1968.5 ft. For the balanced pairs usedin an RS485-system, wire with a characteristic impedance of higher
than 100 Ohms may be preferred, especially for 19200 and higher baud rates.
Note: It is recommended to always use twisted wires to reduce noise and allow for reliable data communication over greater distances.
Use at least 3-conductor wirewith one twisted pair providinga pair for signal (A & B) and common (COM) connections.
For best performance use shielded 3-conductor wire with one twisted pair providing a pair for signal (A & B),common (COM) and shield
ground (SHD) connections.
Figure 3-6 MRS-485 wiring
3.4.2.1 Topology
An RS485-MODBUS configuration without repeater has onetrunk cable, along which devices are connected, directly (daisy chaining) or
by short derivation cables. The trunk cable, also named “Bus”, can be long. Its two ends must be connected on Line Terminations. (see
Line Termination - End of Line Resistor section). The use of repeaters between several RS485-MODBUS is also possible.
3.4.2.2 Length
The end to endlength of the trunk cable must be limited. Themaximum length depends on the baud rate, the cable (Gauge,
Capacitance or Characteristic Impedance), the number of loads on the daisy chain, and the network configuration (2-wire). For a
maximum 9600 Baud Rate and AWG26 (or wider) gauge, the maximum length is 1000m 3281ft. The derivations must be short, never
more than 20m65.5ft. If a multi-port tapis used with n derivations,each one must respect a maximum length of 40m 131ft divided by n.
3.4.2.3 Grounding
The Common circuit (COM)must be connecteddirectly to protective ground, preferably at one point only for the entire bus.
3.4.2.4 Power Wire
All field wiring is completed via modular connectors (provided). After wiring, simply plug the modular connectors into the matching
connectorsontheMRS-485.Thepowerconnectionstotheremotely mounteddetectorsshouldbesizeAWG18(minimum)forshortruns.
Since Macurco detectors are rated for operation between 12 and 24 VDC or VAC, the voltage drop between the power supply and the
MRS-485 should not be an issue if the recommended power wire gauge guidelines below are followed. The terminals will accept wire

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from 16 to 28 AWG. To install a wire, strip back approximately 0.25 in. (6 mm) of insulation and insert the bare wire into the terminal.
Tighten the screw clamp andensure that the wire cannot beeasily pulled from the connector.
3.4.2.5 Power Supply
Selection of aUL recognized NEC Class 2 powersupply which can power12 MRS-485 connected to 6-Series detectors.
•MRS-485 is rated 3.25W with a detector connected.
•The minimum power which the power supply needs to deliver is 12 detectors x 3.25 W/detector = 39W
So, a 24VDC, 60W power supply will work.
Wire gauge
Maximum Run Length
(feet)
(meters)
18
263
80
16
418
127
14
665
203
12
1058
322
Table 3-2a Wire selection for a 60W power supply
3.4.2.6 Relay Connection
All poles of the three relays are available at the modularconnector R1 R2 R3 (see Figure 2 for details). R1 R2 R3 isa 9-position variant
of the high voltagemodular connector used for power input.Each terminal can accommodate a wire size from 12 to 24 AWG.
Figure 3-7 Relay Connector
To install the wiring for the relays, disconnect the connector from the header on the PCB. Strip the insulation off each wire back
approximately 1/4 in. (6.5 mm), insert the barewire into the terminal and tighten the screwclamp. Ensure that the wire cannot easily be
pulled from the connector.
3.4.2.7 Horn & Strobe Connection
The external horn and strobe connections are available at the modular connector S H (see Figure 2 for details). S H as a 4-position
connector, similar to the sensor interface connectors.

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Figure 3-8 Horn & Strobe Connector
To install the wiring for the horn or strobe, disconnect the connector from the header on the PCB. Strip the insulation off each wire back
approximately 0.25 in. (6 mm), insert the bare wire into the terminal and tighten the screw clamp. Ensure that the wire cannot easily be
pulledfromtheconnector.Whenallwiresareconnected,seatthemodularconnectorintothePCBheader;ensurethatthelatchengages.
Refer to Table 2 3 for recommended wire gauge vs. run length for the horn & strobe functions (maximum 2.5-volt drop in the wire). The
Strobe and Horncircuits are Class2 control circuits, so Class 2 conductors should be used.
Wire gauge
Maximum Run Length
(feet)
(meters)
24
200
61
22
340
103
20
480
147
18
850
215
Table 3-3 Wire gauge for Horn & Strobe functions
WARNING
Immediately exit any environment thatcauses an alarm condition on the sensor. Failureto do so may result in serious injury or death.
3.5 Interfacing Macurco Sensors
3.5.1 DVP-120
Macurco sensors with current loop outputs may be used with the DVP-120. See http://www.macurco.com for information on compatible
Macurco gas transducers. Seespecific information on othermanufacturer’s transducers.
Power connections to Macurco sensors used with the DVP-120 are polarity-insensitive (no polarity) since a bridge rectifier is connected
to the power input terminals. All sensors used with the DVP-120 panel employ screw clamp terminal blocks for power and signal
connections. The polarity of the current loopconnections is markedon the printed circuit board of the sensor.
3.5.2 DVP-120B
The Macurco MRS-485 Adapter converts the Macurco 6-Series 4-20mA analog output to a digital output for use with theDVP-120B and
other addressable network systems

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1. Remove the 4-20mA/Powerplug from the Macurco 6-Series gas detector
2. Plug the MRS-485 adapter into the empty socket.
3. Install the provided MRS-485 screw.
4. See the wiringdiagram forwire connection.
Figure 3-9 MRS-485 Installation
3.5.2.1 Connection
TheMacurcoMRS-485 outputis connectedvia afour-terminalscrew typeconnector.TheMRS-485adapteriswiredinthe standard2W-
Modbus circuit definition with selectable built-in terminating resistors atthe ends ofthe RS-485 bus. Thepower for the MRS-485 adapter
is connected via a two-terminal screw type connector, 12 to 24 VAC or 12 to 24 VDCand no polarity.
Note: Running the Modbus cable adjacent to or in the same conduit with high voltage wires is not recommended as there may be
interference from the high voltages.
Figure 3-10 Modbus Wiring

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3.5.2.2 Line Termination - End of Line Resistor
TheMRS-485andDVP-485Badaptersarewiredinthestandard2W-Modbuscircuitdefinitionwithselectablebuilt-interminatingresistors
at the ends of the RS-485 bus. The MRS-485 and DVP-485B adapters provide integral termination for the end of line resistors (EOL).
The terminations use 4-pin connector (for MRS-485) and 3-pin (for DVP-485B) with a jumper to select termination: The user selects no
termination or one of the two Modbus line termination options. The MRS-485 has two line termination options provided and DVP-485B
adapters have 120-ohm termination options provided onboard.
Figure 3-11 End of Line Resistor
Place the EOLjumper on one of the following positions:
3.5.2.3 Determining EOL Use
Atthebaudrateof19200(defaultbaudrateforMacurcoMRS-485andDVP-485)andwithcableslessthan1,000ft.inlength,termination
resistors are not recommended.
At the baud rate of19200 and with cables longer than 1,000 ft., termination resistors are recommended.
It is recommended to use an RS-485 type of cable and 120 ohms for termination resistor.
An RS-485 network requires a 3-wire cable: a twisted pair and a third wire. It is difficult to tell whether shielding is required or not in a
particular system until problems arise, so it is recommended to always use shielded cable.
When using termination resistors use only 2 resistors, one at each end of the RS-485 transmission line (i.e. 1 at the DVP-485B and 1 at
the last/farthest MRS-485).
3.5.2.4 Using Other Baud Rates
For any other baud rates calculate when (at what length) termination resistors are required. Calculate the length as 1000 ft. divided by
the ratio between the new baud rate and19200.
For example, if new baud rateis 9600
1000 / (9600/19200) = 1000 /0.5 = 2000 (ft.)
Use termination resistors when cables arelonger than 2000ft.
For example, if new baud rateis 38400
1000 / (38400/19200) = 1000 /2 = 500 (ft.)
Use termination resistors when cables arelonger than 500 ft.
Note: Other manufacturers may have different recommendations on wire length and EOL resistor usage.

16
Figure 3-12
At 19200 baud rate(default), 1000 ft orless and using RS-485 or Cat-5 type cable
Figure 3-13
At 19200 baud rate(default), more than 1000 ft andusing RS-485 type cable

17
3.5.2.5 DIP Switches and Addressing
Each MRS-485 (and the partner gas detector) must be configured to a unique address. If there are 10 detectors on the serial line, then
10 unique addresses must beused, one for each detector. To set the address, use the eight DIP switch positions. For each unit choose
the value from 13 to 99 (see chart) and set the eight switches to match the address. UP means ON or 1 and DOWN means OFF or 0.
For example, to configure a unit asaddress “50”, setswitches “2, 5, 6” (see table) toON or in the up position (01001100). See page 11
for a list of applicable addresses and dip-switch settings.
13 = 1, 3, 4
14 = 2, 3, 4
15 = 1, 2, 3, 4
16 = 5
17 = 1, 5
18 = 2, 5
19 = 1, 2, 5
20 = 3, 5
21 = 1, 3, 5
22 = 2, 3, 5
23 = 1, 2, 3, 5
24 = 4, 5
25 = 1, 4, 5
26 = 2, 4, 5
27 = 1, 2, 4, 5
28 = 3, 4, 5
29 = 1, 3, 4, 5
30 = 2, 3, 4, 5
31 = 1, 2, 3, 4, 5
32 = 6
33 = 1, 6
34 = 2, 6
35 = 1, 2, 6
36 = 3, 6
37 = 1, 3, 6
38 = 2, 3, 6
39 = 1, 2, 3, 6
40 = 4, 6
41 = 1, 4, 6
42 = 2, 4, 6
43 = 1, 2, 4, 6
44 = 3, 4, 6,
45 = 1, 3, 4, 6
46 = 2, 3, 4, 6
47 = 1, 2, 3, 4, 6
48 = 5, 6
49 = 1, 5, 6
50 = 2, 5, 6
51 = 1, 2, 5, 6
52 = 3, 5, 6
53 = 1, 3, 5, 6
54 = 2, 3, 5, 6
55 = 1, 2, 3, 5, 6
56 = 4, 5, 6
57 = 1, 4, 5, 6
58 = 2, 4, 5, 6
59 = 1, 2, 4, 5, 6
60 = 3, 4, 5, 6
61 = 1, 3, 4, 5, 6
62 = 2, 3, 4, 5, 6
63 = 1, 2, 3, 4, 5, 6
64 = 7
65 = 1, 7
66 = 2, 7
67 = 1, 2, 7
68 = 3, 7
69 = 1, 3, 7
70 = 2, 3, 7
71 = 1, 2, 3, 7
72 = 4, 7
73 = 1, 4, 7
74 = 2, 4, 7
75 = 1, 2, 4, 7
76 = 3, 4, 7
77 = 1, 3, 4, 7
78 = 2, 3, 4, 7
79 = 1, 3, 4, 7
80 = 5, 7
83 = 1, 2, 5, 7
84 = 3, 5, 7
85 = 1, 3, 5, 7
86 = 2, 3, 5, 7
87 = 1, 2, 3, 5, 7
88 = 4, 5, 7
89 = 1, 4, 5, 7
90 = 2, 4, 5, 7
91 = 1, 2, 4, 5, 7
92 = 3, 4, 5, 7
93 = 1, 3, 4, 5, 7
94 = 2, 3, 4, 5, 7
95 = 1, 2, 3, 4, 5, 7
96 = 6, 7
97 = 1, 6, 7
98 = 2, 6, 7
99 = 1, 2, 6, 7
3.5.2.6 Normal MRS-485 Operation
The MRS-485 will monitor the 4-20 mA current output of thedetector. At power up and during its warm-up period, the 6-Series detector
will communicate its sensor type over the 4-20 current output using a custom protocol. The MRS-485 will automatically register each 6-
Series detector as it is programmed with information about all the detectors to which it can be connected. The MRS-485 will use this
information to determine the gas level sensed by the 6-Series detector by measuring the 4-20 mA current-loop output during normal
operation of the detector.
•When the LED is solid GREEN, the operation is normal, the MRS-485 knows the detector type, no errors are
detectedand no MODBUS dataare being received ortransmittedover the RS-485 line.
•When the LED is GREEN with random bursts ofAMBER, the operation is normal and now data are being received
or transmitted over the RS-485 line. The AMBER LED will come on anytime that there is data traffic

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4 Operations
4.1 Initial Operating Mode
When power is first applied to the DVP-120, a few simple self-tests will be performed, and the system willcycle through all status lights,
and display the system model and firmware version number (Figure 4-1). The system will then proceed to normal mode if the operating
parameters have been entered.
D
V
P
-
1
2
0
V
e
r
1
.
0
7
Figure 4-1 Model Display
WARNING
Each time the unit is turned on it performs a self-test, which activates the audible and visual alarms. If the self-test fails, or all the alarms
do not activate, donot use. Failure todo so may adversely affect product performance and result in serious injury or death.
If the user has not entered any parameters, the system WILLNOT be controlling the ventilation system. The relays WILLNOT actuate,
and the horn and strobe outputs WILL NOT be powered. The power status light will show NORMAL (steady green) and the system will
immediately enter the CONFIGURATION mode, seesection 4.2 for details to set the configuration parameters.
If a valid set of configuration parameters have been entered, the panel will wait for all sensors to warm up. During this time, the display
will show a count-down,minutes and seconds, until the endof the warm-up period, (Figure 4-2).
D
V
P
-
1
2
0
V
e
r
.
1
.
0
7
W
a
r
m
-
u
p
2
:
3
0
Figure 4-2 Warm=Up display
During the warm-up period, the keypad will be locked. When the warm-up period ends, the LCD will start showing the normal display.
4.1.1 Status Light Display
The POWER, ALARM/WARNING, SILENCE, RELAY 1, RELAY 2 and RELAY 3status lights indicate thesystem statusand provide the
following data:
•POWER
oGreen (steady) – Power isgood and there are no trouble indications
oYellow (steady) – Trouble is indicated bya transduceror the panelitself
•ALARM/WARNING
oOff – All indicatedgas levels are below the warning level
oRed (steady) – One or more gas levels are at or above the alarm level
oAmber (steady) – One or more gas levels are at or above the warning level
•HUSH
oOff –There are no silenced alarms or warnings
oRed (flashing) –There are alarms, warnings and/or troubles that have been silenced (gas levelsmayor
may not remain orcontinueto be atan alarm or warning levels)
•RELAY 1
oOff – Relay 1 is not on
oGreen (steady) – Relay 1 is on
•RELAY 2
oOff – Relay 2 is not on

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oGreen (steady) – Relay 2 is on
•RELAY 3
oOff – Relay 3 is not on
oGreen (steady) – Relay 3 is on
The overall system status isvisible at a distancevia the status lightsas described above.More detailed system information is displayed
on the LCD, which can showthe status of each relayand sensor. A typical status display is shownin Figure 4-4.
4.1.2 User Interface
TheLCDdisplayisusedtoshowdetailedinformationaboutthestatusofthecontrolsystemandtheconfigurationparameterstotheuser.
The keypad is used to select the information displayed and to enter the configuration parameters, which are stored in the DVP-120
memory. The keypad consists of the usual ten-digit keys, four direction keys, plus a MENU key that is used to access the configuration
menu and a HUSH key that will silence the audible alarm indicators. In normal mode,holding the zero key for three (3) seconds can be
used to lock thekeypad against accidental (or unauthorized)use. See Section 4.5 for details.
Figure 4-3 Keypad layout
4.1.3 Cursor Keys
In normal mode, (no warningsor alarms indicated), the up and down cursor keys will scroll the display to any configured sensors’ status.
In normal mode, the left and right cursor keys will scroll through the status of each of the relays. When the left (or right) key is used to
scroll to another relay, the display will remove the underlining under the sensor number and underline the relay number; this indicates
thatthedigitkeyscanbeusedtojumpdirectlytoaparticularrelay’sstatus.Whentheupordownkeyisagainusedthedisplaywillswitch
back to the digitkeys jumping to a particular sensor.
4.1.4 MENU Key
The MENU key has three functions. First, when the system is presenting the normal display, pressing the MENU key will cause the
system to shift to the ConfigurationMenu. The second function of the MENU key is to return to the next-higher menu level, e.g. from the
sensor configuration menu to the system menu, or from the system menu out to normal mode. If in the middle of entering a multi-digit
parameter, the MENU key also cancels any changes to the parameter. When the MENU key is used to return to normal mode, any
changedconfigurationparametersaresavedintheDVP-120’smemory.ThethirdfunctionoftheMENUkeyistochangetheLCDcontrast
by holding the MENU key for five (5) seconds, at whichpoint the LCD will prompt for furtheractivities, see sections 4.4 for more detail.
4.1.5 HUSH Key
The HUSH key is only used to silence the audible indicators (internal buzzer and possible external Horn and Strobe devices). Pressing
and releasing the button will silence the internal buzzer. The HUSH button must be held for 3 seconds to silence the Horn and Strobe
devices.

20
4.1.6 Normal Status Display
M
O
N
1
0
:
2
3
R
1
O
F
F
S
0
1
C
O
5
P
P
M
Figure 4-4 Normal System Display
The display shows the day of the week and the time of day, in 24-hour format. It also shows the status of one of the relays, R1 in this
example, and the type and indicated the gas concentration of one of the configuredsensors, S01 is a CO sensor indicating 5ppm in this
example.
Notice in Figure 4-4 that the digits 0 1 are underlined; this indicates that the digit keys can be used to jump directly to another sensor’s
status. When the first digit is pressed,the display will prompt for the second digit of the target sensor.
S
h
o
w
S
e
n
s
o
r
_
1
Figure 4-5 Sensor Prompt
In this example, the first digit entered was 1. Since the DVP-120 can handle 12 sensors, the first digit for a sensor number is either 0 or
1. The leading zero must be entered when selecting a sensor less than ten. When the second digit is entered, the normal display will be
restored; showing the type and value of the selected sensor.
Asmentionedabove,theleftandrightscrollkeyswilldisplaythenextorpreviousrelay’sstatus.Thedisplaywillalsochangetheunderline
to indicate that the digit keys (zero, one and two) can be used to jump directly to a particular relay. Since only one digit is needed to
select a relay, the system does it immediately rather thanprompting to showthe relay.
Ifthe sensoris indicatinga gaslevelthatis greaterthanthe alarmorwarninglevels,thegasreadingwill alternatewiththewords ALARM
or WARNING as appropriate. If a sensor fails, a connection is lost or the panel itself detects a failure of its own, the panel will enter
TROUBLE mode and the gas reading will be replaced by the word TROUBLE (the TROUBLE status condition is discussed in section
4.1.6 Trouble Status Display).
4.1.7 ALARM Status Display
When any sensor indicates a gas level that is at or above the configured alarm level for the sensor, the panel will enter ALARM mode,
during which the internal buzzer will sound, the alarm lamp will be red and the LCD will show the sensor type and channel number.
A
L
A
R
M
C
O
S
E
N
S
O
R
0
2
Figure 4-6 Alarm Display
The display will cycle through all sensors that are signaling alarm levels, at five seconds per display. Pressing any key (except HUSH)
will advance the display to thenext sensor that is signaling an alarmlevel.
WARNING
Do not cover or obstruct audible alarm opening or visual alarm LED. Doing so may adversely affect product performance and result in
serious injury or death.
Ifan externalhornand/orstrobeareconnectedandconfiguredtosignalanalarmcondition,they willalsosoundwhenan alarmcondition
occurs, after a delay if thatconfiguration optionis used.