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DVP-120C
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Macurco DVP-120C User Manual

Macurco™ DVP-120C
Detection and Ventilation Control Panel with BACnet User Instructions
IMPORTANT: Keep these user instructions for reference.
Macurco DVP-120C Manual
Macurco DVP-120C Manual
Table of Contents
1 General Safety Information ...................................................................................................................................... 7
1.1 List of warnings ................................................................................................................................................. 7
2 Use Instructions and Limitations .............................................................................................................................. 8
2.1 DVP-120C General Description ......................................................................................................................... 8
2.2 DVP-485B Modbus® Adapter ........................................................................................................................... 8
2.3 MRS-485 Modbus Adapter ............................................................................................................................... 8
2.4 Features ............................................................................................................................................................ 9
2.5 Specifications .................................................................................................................................................... 9
3 Installation Instructions .......................................................................................................................................... 10
3.1 Location & Mounting ...................................................................................................................................... 10
3.2 Installation ...................................................................................................................................................... 11
3.2.1 General Wiring Information ................................................................................................................... 11
3.2.2 Power Connection .................................................................................................................................. 12
3.2.3 Remote Sensor Connection .................................................................................................................... 13
3.2.4 Relay Connection .................................................................................................................................... 15
3.2.5 Horn & Strobe Connection ..................................................................................................................... 16
3.2.6 Interfacing Macurco Sensors .................................................................................................................. 16
4 Operations .............................................................................................................................................................. 22
4.1 Power up......................................................................................................................................................... 22
4.2 Initial Operating Mode ................................................................................................................................... 22
4.2.1 Status Light Display ................................................................................................................................. 22
4.3 User Interface ................................................................................................................................................. 23
4.3.1 Cursor Keys ............................................................................................................................................. 23
4.3.2 MENU Key ............................................................................................................................................... 24
4.3.3 Hush Key ................................................................................................................................................. 24
4.4 Normal Status Display .................................................................................................................................... 24
4.5 ALARM Status Display ..................................................................................................................................... 25
4.6 Warning Status Display ................................................................................................................................... 26
4.7 Trouble Status Display .................................................................................................................................... 26
4.8 Unoccupied Failure Display ............................................................................................................................ 27
4.9 Occupied Failure Display ................................................................................................................................ 28
4.10 Calibration Due Warning Display .................................................................................................................... 28
Macurco DVP-120C Manual
4.11 Calibration Overdue Trouble Display ............................................................................................................. 29
4.12 Ventilation Control ......................................................................................................................................... 30
4.12.1 Zone Signal Display ................................................................................................................................. 30
4.13 System Configuration ..................................................................................................................................... 31
4.13.1 System Menu .......................................................................................................................................... 32
4.13.2 Configure System Submenu ................................................................................................................... 32
4.13.3 Configure Sensors Submenu ................................................................................................................... 40
4.13.4 Configure Relays, Horn & Strobe Submenu............................................................................................ 42
4.13.5 Configure Horn Submenu ....................................................................................................................... 43
4.13.6 Configure Strobe Submenu .................................................................................................................... 43
4.13.7 Configure Zones Submenu ..................................................................................................................... 44
4.13.8 Configure Signals Submenu .................................................................................................................... 48
5 BACnet .................................................................................................................................................................... 52
5.1 General Information ....................................................................................................................................... 52
5.1.1 Analog input – Sensor ID ........................................................................................................................ 52
5.1.2 Analog Input – Gas Reading .................................................................................................................... 52
5.1.3 Binary Input – MRS Trouble .................................................................................................................... 52
5.1.4 Binary Input – Over Range ...................................................................................................................... 52
5.1.5 Binary Input – Trouble ............................................................................................................................ 52
5.1.6 Binary Input – DVP Com Error ................................................................................................
................ 52
5.2 Macurco Network Parameter Utility (NPU) .................................................................................................... 52
5.3 BACnet Connection ......................................................................................................................................... 54
5.3.1 Serial RS-485 to USB Wiring ................................................................................................................... 55
5.3.2 BACnet MS/TP to BACnet/IP................................................................................................................... 56
5.4 BACnet Software ............................................................................................................................................ 56
6 Troubleshooting ..................................................................................................................................................... 56
6.1 System Status Light......................................................................................................................................... 56
6.1.1 Input Channel Trouble ............................................................................................................................ 57
6.1.2 Internal Controller board Trouble .......................................................................................................... 58
6.2 Timed Ventilation Problem ............................................................................................................................ 58
6.3 No Power ........................................................................................................................................................ 58
6.4 LCD Display Unreadable ................................................................................................................................. 58
6.5 Keypad does not respond ............................................................................................................................... 59
Macurco DVP-120C Manual
6.5.1 LCD shows KEYS LOCKED ........................................................................................................................ 59
6.5.2 After silencing Alarm, Warning or Trouble ............................................................................................. 59
6.6 Power Failure .................................................................................................................................................. 59
6.7 MRS-485 Modbus Application ........................................................................................................................ 59
6.7.1 Normal Operation ................................................................................................................................... 59
6.7.2 Unknown Sensor Code ........................................................................................................................... 59
6.7.3 Error Codes ............................................................................................................................................. 59
6.7.4 Dip Switch Settings Codes ...................................................................................................................... 60
7 Testing & Maintenance .......................................................................................................................................... 61
7.1 Testing ............................................................................................................................................................ 61
7.1.1 Keypad Test ............................................................................................................................................ 61
7.1.2 Functionality Test ................................................................................................................................... 61
7.2 Maintenance ................................................................................................................................................... 62
8 Appendix A – Table of Figures ................................................................................................................................ 63
9 Appendix B – Quick Setup ...................................................................................................................................... 67
9.1 Configure System Submenu ........................................................................................................................... 70
9.1.1 Set Time of Day ....................................................................................................................................... 70
9.1.2 Set Day of Week ..................................................................................................................................... 70
9.1.3 Load Default Configuration .................................................................................................................... 70
9.1.4 Change Password.................................................................................................................................... 70
9.1.5 Enter Password ....................................................................................................................................... 71
9.2 Configure Sensors Submenu........................................................................................................................... 71
9.2.1 See section 4.2 Initial Operating Mode for more detail ......................................................................... 71
9.2.2 See section 4.3 User Interface for more detail ....................................................................................... 71
9.2.3 See section 4.13 System Configuration for more detail ......................................................................... 71
9.2.4 See section 4.13.3 Configure Sensors Submenu for more detail ........................................................... 71
9.3 Configure Relays, Horn & Strobe Submenu ................................................................................................... 72
9.3.1 See section 4.13.4 Configure Relays, Horn & Strobe Submenu for more detail .................................... 72
9.4 Configure Zones Submenu ............................................................................................................................. 73
9.4.1 See section 4.13.7 Configure Zones Submenu for more detail .............................................................. 73
9.5 Configure Signals Submenu ............................................................................................................................ 75
9.5.1 See section 4.13.8 Configure Signals Submenu for more detail ............................................................ 75
10 Appendix C – Setup Record ................................................................................................................................ 76
Macurco DVP-120C Manual
11 Appendix D – DVP-120 Quick Start Guide .......................................................................................................... 77
12 Macurco Gas Detection Product limited warranty ............................................................................................. 80
Technical Support Contact Information ....................................................................................................................... 80
General Contact Information ........................................................................................................................................ 80
WARNING
Each person using this equipment must read and understand the information in this
adversely affect product
performance.
This equipment helps monitor for the presence and concentration level of certain
sent and could result in
Support at 1-844-325-3050.
DVP-120C may not function effectively below 32°F (0°C) or above 120°F (49°C). Using the equipment outside of this temperature range may adversely affect product.
High voltage terminals (120/240 VAC) are located within the DVP-120C, presenting a
servicing the unit.
Immediately exit any environment that causes an alarm condition on the sensor.
Each time the unit is turned on it performs a self-test, which activates the audible and
contact Technical Support at 1-844-325-3050.
Do not cover or obstruct audible alarm opening or visual alarm LED. Doing so may adversely affect product performance.
Use only for monitoring the gases which the sensors and equipment are designed to
roper use, see supervisor or User manual, or Contact
Technical Support at 1-844-325-3050.
Failure to follow instructions outlined in this user manual can result in sickness or death.
Macurco DVP-120C Manual

1 General Safety Information

1.1 List of warnings

User manual before use. Use of this equipment by untrained or unqualified persons or use that is not in accordance with this user manual, may
specified airborne gases. Misuse may produce an inaccurate reading, which means that higher levels of the gas being monitored may be pre overexposure. For proper use, see supervisor or User manual, or call Macurco Technical
hazard to service technicians. Only qualified technicians should open the DVP-120C case and service the internal circuits. Ensure power is removed from the DVP-120C prior to
visual alarms. If the self-test fails, or all the alarms do not activate, do not use and
detect. Failure to do so may result in exposures to gases not detectable and result in serious injury or death. For p
WARNING
Each person using this equipment must read and understand the information in this
l, may adversely affect product
performance.
Macurco DVP-120C Manual

2 Use Instructions and Limitations

2.1 DVP-120C General Description

The DVP-120C is an exhaust fan controller and alarm interface. When used in conjunction with Macurco gas detectors, it provides automatic controls to help maintain an acceptable environment in enclosed facilities. The DVP­120C is frequently used in parking garages, warehouses, and vehicle maintenance facilities. The DVP-120C 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-120C can control up to 99 digital addressable sensors and is compatible with Macurco CM-6 and TX-6-ND detectors ONLY. The DVP-120C is ready for operation after the wiring is complete and the user system configuration is entered.

2.2 DVP-485B Modbus® Adapter

The DVP-485B Modbus adapter, installed in DVP-120C, provides a RS-485 BACnet output. System wiring includes RS­485 serial detector interface as well as main power connection for the DVP-120C, the fan control and alarm connections from the DVP-120C to the building ventilation and automation systems. The RS-485 serial interface is from the DVP-120C to the remote detectors. Power to these detectors is provided by an external 24VAC or VDC low voltage power supply. See section 3.2.3 Remote Sensor Connection supplies.
for more information regarding remote power

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-120C and other multipoint addressable systems. 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 6­Series detector installed on a 4”x 4” electrical box electrical box supplied by the contractor.
User manual before use. Use of this equipment by untrained or unqualified persons or use that is not in accordance with this user manua
Macurco DVP-120C Manual

2.4 Features

• LCD display showing the status of each transducer and relay
• External keypad for user selection of the transducer/alarm display and setting the configuration (password
protected)
• Up to three ventilation control zones can be defined
• Each zone can be controlled based on transducer signals and/or time of day
• Each relay is configurable with a delay before activation and minimum on time
• Fail-safe operation can be implemented
• Lockable NEMA 1 type enclosure
• Modular input and output connectors
• One RS-485 digital input channels - 99 addressable sensors
• RS-485 digital output channel for BACnet
• Compatible with Macurco CM-6, TX-6-ND, and MRS-485 adapter, Horn & Strobe Combo
• Three 10A, 240 VAC SPDT Dry Contact relays
• 24VDC Drivers for external Horn and Strobe
• BTL Listed
1
• ETL Listed to UL 2017
1
Where required by federal, state, local regulations or the Authority Having Jurisdiction, DVP-120C is required to be used with Listed Horn/Strobe model 78-2900-0211-X* to meet the 85dB(A) Audibility requirements of Standards UL 2017. *Where “X” represents lens cover color, R for red lens cover, G for green lens cover, B for blue lens cover, O for amber lens cover, C for clear lens cover.
(Type SM)

2.5 Specifications

• Size: 10.5” x 12.5” x 2.” (267 mm x 318 mm x 51 mm)
• Weight: 6 ½ lb (2.9 kg)
• Enclosure: NEMA 1 Type
• Operating Temperature: 32° to 120°F (0° to 49°C)
• Operating Humidity: 0% to 90% 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/Trouble, ALARM/warning, Hush, Relay 1, Relay 2 & 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
• Relay on Delay: 0 – 15 minutes in 1 second increments
• Relay Minimum Run Time: 0 – 15 minutes in 1 second increments
WARNING
This equipment helps monitor for the presence and concentration level of certain
higher levels of the gas being monitored may be present and could result in
Service at 1-844-325-3050.
WARNING
DVP-120C may not function effectively below 32°F (0°C) or above 104°F (40°C). Using the equipment outside of this temperature range may adversely affect product.
Macurco DVP-120C Manual

3 Installation Instructions

Gas detection and exhaust fan control are provided by a Macurco DVP-120C system. System wiring includes the main power connection for the DVP-120C, the fan control connections and/or alarm connections from the DVP-120C to the building ventilation and automation systems. The DVP-120C also includes the RS-485 serial interface from the DVP-120C 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 by the user through the LCD display and keypad. The system display provides the user with the system status and the status of each configured sensor. In addition, all control functions of the DVP-120C may be accessed through the system display and keypad.
specified airborne gases. Misuse may produce an inaccurate reading, which means that
overexposure. For proper use, see supervisor or User manual, or call Macurco Technical
This DVP-120C system should be used with Macurco™ CM-6 and TX-6-ND transducers and each unit will measure the level of the target gas (i.e. CO, and NO communication loop. The transducers operate on low voltage (24VDC). All power and signal connections for the transducers are provided via unshielded two conductor cable from an external power source. DVP-120C 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-120C control panel 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.
) and provide this information to the DVP-120C over Modbus
2

3.1 Location & Mounting

The DVP-120C should be installed in a centralized location, easy to access and protected weather and other environmental elements. DVP-120C is intended for indoor use only. A Mechanical room, Alarm Control Room or other similar areas are recommended.
Mounting holes are provided in the DVP-120C 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.
WARNING
High voltage terminals (120/240 VAC) are located within the DVP-120C, presenting a
servicing the unit.
Macurco DVP-120C Manual

3.2 Installation

Figure 3-1 Mounting Holes

3.2.1 General Wiring Information

hazard to service technicians. Only qualified technicians should open the DVP-120C case and service the internal circuits. Ensure power is removed from the DVP-120C prior to
Figure 3-2 Typical Layout
Signal
Connector
Pin Number
Line (120/220/240/250 VAC)
AC~ 3 Neutral
AC~ 1 Ground
Ground Stud
n/a
Macurco DVP-120C Manual
With the exception of the safety ground, all field wiring is completed via modular connectors (provided). After wiring, simply plug the modular connectors into the matching connectors on the printed circuit board (PCB).
Note: It is recommended to always install with wires enclosed within the rigid metallic conduit.
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.
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-120C 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 should be terminated at the DVP-120C end of the cable only. A ground stud is provided.
The power connections to the MRS-485 and remote mounted sensors 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 two­terminal 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 reliable data communication over 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 to or in the same conduit with high voltage wires is not recommended as there may be interference from the high voltages near the bottom left corner of the panel.

3.2.2 Power Connection

The main power cable should be routed into the bottom left conduit entry. Macurco recommends a minimum wire size of AWG18 and 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 the cabinet with the lock washer and nut supplied. Use a ring terminal for the ground connection. Refer to Table 3-1 for DVP­120C 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 modular connector into AC~ on the PCB and ensure that it latches into the header properly.
Table 3-1 Main Power Connection
1
2
1 Supervised Circuit
Macurco DVP-120C Manual
2 Non-Supervised Circuit
Figure 3-3 System Wiring Diagram

3.2.3 Remote Sensor Connection

Figure 3-4 DVP-120C Internal View
Macurco DVP-120C Manual
Remote sensors must be connected at RS-485 connection labeled TB1 (Refer Figure 3-10). 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 used in 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 wire with one twisted pair providing a 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
3.2.3.1 Topology
An RS485-MODBUS configuration without repeater has one trunk 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.
The DVP-120C has a single Modbus termination block that will accept two trunk cable connections allowing for two MODBUS communication lines. The Trunk cable must be wired in parallel from the panel to the end of line with no off shoots “T-tapping”.
3.2.3.2 Length
The end to end length of the trunk cable must be limited. The maximum 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 20m 65.5ft. If a multi-port tap is used with n derivations, each one must respect a maximum length of 40m 131ft divided by n.
3.2.3.3 Grounding
The Shield (SHD) must be connected directly to protective ground, preferably at one point only for the entire bus.
Wire gauge
Maximum Run Length
(feet)
(meters)
18
263
80
16
418
127
14
665
203
12
1058
322
Macurco DVP-120C Manual
3.2.3.4 Power Wire
All field wiring is completed via modular connectors (provided). After wiring, simply plug the modular connectors into the matching connectors on the MRS-485. The power connections to the remotely mounted detectors should be size AWG18 (minimum) for short runs. 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 in are followed. 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 the screw clamp and ensure that the wire cannot be easily pulled from the connector.
3.2.3.5 External Power Supply
Select a UL recognized NEC Class 2 power supply which can power the MRS-485 units connected to 6-Series detectors.
• Each MRS-485 is rated at 3.25W with a detector connected.
• The minimum power which the power supply needs to deliver for 12 detectors is figured as:
12 detectors x 3.25 W per detector = 39W
• Therefore, a 24VDC, 60W power supply will work.
Table 3-2 Wire selection for a 60W power supply

3.2.4 Relay Connection

All poles of the three relays are available at the modular connector R1 R2 R3 (see Figure 2 for details). R1 R2 R3 is a 9-position variant of the high voltage modular 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 0.25 in. (6.5 mm), insert the bare wire into the terminal and tighten the screw clamp. Ensure that the wire cannot easily be pulled from the connector.
Maximum Run Length
(feet)
(meters)
24
200
61
22
340
103
20
480
147
18
850
215
WARNING
Immediately exit any environment that causes an alarm condition on the sensor.
Macurco DVP-120C Manual

3.2.5 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.
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 pulled from the connector. When all wires are connected, seat the modular connector into the PCB header; ensure that the latch engages. Refer to Table 3-3 for recommended wire gauge vs. run length for the horn & strobe functions (maximum 2.5-volt drop in the wire). The Strobe and Horn circuits are Class 2 control circuits, so Class 2 conductors should be used.
For UL 2017, DVP-120C was tested with one Listed Horn/Strobe model 78-2900-0211-X where X represents lens cover color, R for red lens cover, G for green lens cover, B for blue lens cover, O for amber lens cover, C for clear lens cover.
Wire gauge
Table 3-3 Wire gauge for Horn & Strobe functions

3.2.6 Interfacing Macurco Sensors

Macurco sensors with current loop outputs may be used with the DVP-120C. See www.macurco.com for information on compatible Macurco gas transducers. See specific information on other manufacturer’s transducers.
Macurco DVP-120C Manual
Power connections to Macurco sensors used with the DVP-120C are polarity-insensitive (no polarity) since a bridge rectifier is connected to the power input terminals. All sensors used with the DVP-120C panel employ screw clamp terminal blocks for power and signal connections. The polarity of the current loop connections is marked on the printed circuit board of the sensor.
The Macurco MRS-485 Adapter converts the Macurco 6-Series 4-20mA analog output to a digital output for use with the DVP-120C and other addressable network systems.
1. Remove the 4-20mA/Power plug 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 wiring diagram for wire connection.
Figure 3-9 MRS-485 Installation
3.2.6.1 Connection
The Macurco MRS-485 output is connected via a four-terminal screw type connector. The MRS-485 adapter is wired in the standard 2W-Modbus circuit definition with selectable built-in terminating resistors at the ends of the RS-485 bus. 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.
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.
Macurco DVP-120C Manual
Figure 3-10 Modbus Wiring
3.2.6.2 Line Termination – End of Line Resistor
The MRS-485 and DVP-485B adapters are wired in the standard 2W-Modbus circuit definition with selectable built-in terminating resistors 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.
Place the EOL jumper on one of the following positions:
Figure 3-11 End of Line Resistor
Determining EOL Use
Macurco DVP-120C Manual
3.2.6.3 Baud Rates
At the baud rate of 19200 (default baud rate for Macurco MRS-485 and DVP-485) and with cables less than 1,000 ft. in length, termination resistors are not recommended.
At the baud rate of 19200 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).
For any other baud rates calculate when (at what length) termination resistors are required. This is calculated by dividing the length L by the ratio between the new baud rate and 19200 or (x/19200) where x is the new baud rate.
( 19200 ⁄)
For example, if new baud rate is 9600
1000 
(9600  19200 ⁄)
1000 
=
0.5
= 2000 
Use termination resistors when cables are longer than 2000 ft.
For example, if new baud rate is 38400
1000 
(38400  19200 ⁄)
1000 
=
2
= 500 
Use termination resistors when cables are longer than 500 ft.
Note: Other manufacturers may have different recommendations on wire length and EOL resistor usage.
1 = 1
21 = 1, 3, 5
41 = 1, 4, 6
61 = 1, 3, 4, 5, 6
83 = 1, 2, 5, 7
2 = 2
22 = 2, 3, 5
42 = 2, 4, 6
62 = 2, 3, 4, 5, 6
84 = 3, 5, 7
3 = 1,2
23 = 1, 2, 3, 5
43 = 1, 2, 4, 6
63 = 1, 2, 3, 4, 5, 6
85 = 1, 3, 5, 7
4 = 3
24 = 4, 5
44 = 3, 4, 6
64 = 7
86 = 2, 3, 5, 7
5 = 1,3
25 = 1, 4, 5
45 = 1, 3, 4, 6
65 = 1, 7
87 = 1, 2, 3, 5, 7
6 = 2,3
26 = 2, 4, 5
46 = 2, 3, 4, 6
66 = 2, 7
88 = 4, 5, 7
7 = 1,2,3
27 = 1, 2, 4, 5
47 = 1, 2, 3, 4, 6
67 = 1, 2, 7
89 = 1, 4, 5, 7
8 = 4
28 = 3, 4, 5
48 = 5, 6
68 = 3, 7
90 = 2, 4, 5, 7
9 = 1,4
29 = 1, 3, 4, 5
49 = 1, 5, 6
69 = 1, 3, 7
91 = 1, 2, 4, 5, 7
Macurco DVP-120C Manual
Figure 3-12 EOL Placement Less than 1000 ft
At 19200 baud rate (default), 1000 ft or less and using RS-485 or Cat-5 type cable
Figure 3-13 EOL Placement greater than 1000 ft
At 19200 baud rate (default), more than 1000 ft and using RS-485 type cable
3.2.6.4 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 be used, one for each detector. To set the address, use the eight DIP switch positions. For each unit choose the value from 1 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 as address “50”, set switches “2, 5, 6” (see table) to ON or in the up position (01001100). See page 11 for a list of applicable addresses and dip-switch settings.
Figure 3-14 MRS-485 Dip Switch (Address “50” Shown)
10 = 2,4
30 = 2, 3, 4, 5
50 = 2, 5, 6
70 = 2, 3, 7
92 = 3, 4, 5, 7
11 = 1,2,4
31 = 1, 2, 3, 4, 5
51 = 1, 2, 5, 6
71 = 1, 2, 3, 7
93 = 1, 3, 4, 5, 7
12 = 3,4
32 = 6
52 = 3, 5, 6
72 = 4, 7
94 = 2, 3, 4, 5, 7
13 = 1, 3,4
33 = 1, 6
53 = 1, 3, 5, 6
73 = 1, 4, 7
95 = 1, 2, 3, 4, 5, 7
14 = 2, 3, 4
34 = 2, 6
54 = 2, 3, 5, 6
74 = 2, 4, 7
96 = 6, 7
15 = 1, 2, 3, 4
35 = 1, 2, 6
55 = 1, 2, 3, 5, 6
75 = 1, 2, 4, 7
97 = 1, 6, 7
16 = 5
36 = 3, 6
56 = 4, 5, 6
76 = 3, 4, 7
98 = 2, 6, 7
17 = 1, 5
37 = 1, 3, 6
57 = 1, 4, 5, 6
77 = 1, 3, 4, 7
99 = 1, 2, 6, 7
18 = 2, 5
38 = 2, 3, 6
58 = 2, 4, 5, 6
78 = 2, 3, 4, 7
19 = 1, 2, 5
39 = 1, 2, 3, 6
59 = 1, 2, 4, 5, 6
79 = 1, 3, 4, 7
20 = 3, 5
40 = 4, 6
60 = 3, 4, 5, 6
80 = 5, 7
Macurco DVP-120C Manual
Table 3-4 Dip switch settings
3.2.6.5 Normal MRS-485 Operation
The MRS-485 will monitor the 4-20 mA current output of the detector. 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 detected, and no MODBUS data are being received or transmitted over the RS-485 line.
• When the LED is GREEN with random bursts of AMBER, 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
D V P - 1 2 0 C V 5. 0 1 . G
WARNING
Each time the unit is turned on it performs a self-test, which activates the audible and
contact Technical Support at 1-844-325-3050.
D V P - 1 2 0 C V 5
.0 1 .G W a r m - u p 2 : 3 0
Macurco DVP-120C Manual

4 Operations

4.1 Power up

When power is first applied to the DVP-120C, a few simple self-tests will be performed, and the system will cycle 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.

Figure 4-1 Model Display

visual alarms. If the self-test fails, or all the alarms do not activate, do not use and

4.2 Initial Operating Mode

If the user has not entered any parameters, the system WILL NOT be controlling the ventilation system. The relays WILL NOT 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, see section 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 end of the warm-up period, (Figure 4-
2).

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.

4.2.1 Status Light Display

The POWER, ALARM/WARNING, SILENCE, RELAY 1, RELAY 2 and RELAY 3 status lights indicate the system status and provide the following data:
• POWER/TROUBLE
o Green (steady) – Power is good and there are no trouble indications o Yellow (steady) – Trouble is indicated by a transducer or the panel itself
• ALARM/WARNING
o Off – All indicated gas levels are below the warning level o Red (steady) – One or more gas levels are at or above the alarm level o Amber (steady) – One or more gas levels are at or above the warning level
• HUSH
Macurco DVP-120C Manual
o Off –There are no silenced alarms or warnings o Red (flashing) –There are alarms, warnings and/or troubles that have been silenced (gas levels may
or may not remain or continue to be at an alarm or warning levels)
• RELAY 1
o Off – Relay 1 is not on o Green (steady) – Relay 1 is on
• RELAY 2
o Off – Relay 2 is not on o Green (steady) – Relay 2 is on
• RELAY 3
o Off – Relay 3 is not on o Green (steady) – Relay 3 is on
The overall system status is visible at a distance via the status lights as described above. More detailed system information is displayed on the LCD, which can show the status of each relay and sensor. A typical status display is shown in Figure 4-4.

4.3 User Interface

The LCD display is used to show detailed information about the status of the control system and the configuration parameters to the user. The keypad is used to select the information displayed and to enter the configuration parameters, which are stored in the DVP-120C memory. The keypad consists of 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 the keypad against accidental (or unauthorized) use. See Section 4.5 for details.

Figure 4-3 Keypad layout

4.3.1 Cursor Keys

In normal mode, (no warnings or 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
State of the Panel
Silence Period
Alarm
5 minutes
Occupied Failure
5 minutes
Unoccupied Failure
4 hours
Warning
15 minutes
Calibration Due Warning
Refer Table 4-2
Calibration Due Trouble
15 minutes
Trouble
8 hours
Zone Signal
15 minutes
M O N 1 0 : 2 3 R 1 O F F S 0 1 C O 5 P P
M
Macurco DVP-120C Manual
the sensor number and underline the relay number; this indicates that the digit keys can be used to jump directly to a particular relay’s status. When the up or down key is again used the display will switch back to the digit keys jumping to a particular sensor.

4.3.2 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 Configuration Menu.
• 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 changed configuration parameters are saved in the DVP­120C’s memory.
• The third function of the MENU key is to change the LCD contrast by holding the MENU key for five (5) seconds, at which point the LCD will prompt for further activities, see sections 4.4 for more detail.

4.3.3 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.
The following table shows the silence period for different state of the panel.
Table 4-1 Hush function Silence Period

4.4 Normal Status Display

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 configured sensors, S01 is a CO sensor indicating 5ppm in this example.
Note: The “S” will alternate between “S” (capital) and “s” (lowercase), this indicates that the sensor is communicating with the DVP-120C
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