Macurco DVP-1200 User manual

IMPORTANT: Keep these user instructions for reference.
Macurco™ DVP-1200 Manual
Detection and Ventilation Control Panel with BACnet
Operation Instructions

MacurcoTM DVP-1200 Manual
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Table of Contents
1General Safety Information........................................................................................................................................................5
1.1 List of warnings ................................................................................................................................................................. 5
2Use Instructions and Limitations................................................................................................................................................6
2.1 DVP-1200 General Description..........................................................................................................................................6
2.2 Remote Relay ....................................................................................................................................................................6
2.3 MRS-485 Modbus Adapter................................................................................................................................................6
2.4 Features.............................................................................................................................................................................7
2.5 Specifications ....................................................................................................................................................................7
3Installation Instructions .............................................................................................................................................................8
3.1 Location & Mounting.........................................................................................................................................................8
3.2 Installation......................................................................................................................................................................... 9
3.2.1 General Wiring Information..........................................................................................................................................9
3.2.2 Installation Diagram....................................................................................................................................................10
3.2.3 Power Connection.......................................................................................................................................................11
3.2.4 Remote Sensor Connection ........................................................................................................................................12
3.2.5 Remote Relay Connection...........................................................................................................................................18
3.2.6 Remote Relay Operation............................................................................................................................................. 19
3.2.7 Horn & Strobe Connection..........................................................................................................................................20
4Operations ...............................................................................................................................................................................21
4.1 Power up .........................................................................................................................................................................21
4.1.1 Initial Operating Mode................................................................................................................................................21
4.2 User Interface.................................................................................................................................................................. 21
4.2.1 LCD Display..................................................................................................................................................................21
4.2.2 Status Lights................................................................................................................................................................21
4.2.3 Keypad ........................................................................................................................................................................22
4.3 Normal Status Display .....................................................................................................................................................23
4.4 ALARM, WARNING, and TROUBLE Status Display ...........................................................................................................24
4.4.1 ALARM Status Display ................................................................................................................................................. 24
4.4.2 Warning Status Display ...............................................................................................................................................25
4.4.3 Trouble Status Display ................................................................................................................................................25
4.5 Ventilation Control ..........................................................................................................................................................26
4.6 Main Menu......................................................................................................................................................................27

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4.6.1 CONFIGURE SYSTEM? ................................................................................................................................................. 27
4.6.2 MANUAL CONFIGURE?................................................................................................................................................27
4.6.3 CONFIGURE RELAYS, H/S, BUZZER? ............................................................................................................................37
4.6.4 COMMUNICATION? .................................................................................................................................................... 46
4.6.5 VIEW SENSORS? ..........................................................................................................................................................48
4.6.6 DATE/TIME – PASSWORD?..........................................................................................................................................50
4.6.7 EVENTS? ......................................................................................................................................................................50
4.6.8 TECHNICAL SUPPORT? ................................................................................................................................................ 51
5BACnet ..................................................................................................................................................................................... 52
5.1 General Information........................................................................................................................................................52
6Testing & Maintenance............................................................................................................................................................57
6.1 Testing .............................................................................................................................................................................57
6.1.1 Relay Functionality Test ..............................................................................................................................................57
6.1.2 Horn and Strobe Functionality Test ............................................................................................................................57
6.2 Maintenance ................................................................................................................................................................... 58
7Appendix A – Table of Figures..................................................................................................................................................59
8Appendix C – Replacement Parts .............................................................................................................................................61
9Appendix D – Setup Record ..................................................................................................................................................... 62
10 Macurco Gas Detection Product limited warranty .................................................................................................................. 65
Technical Support Contact Information........................................................................................................................................65
General Contact Information ........................................................................................................................................................ 65

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MacurcoTM DVP-1200 Manual
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1General Safety Information
1.1 List of warnings
WARNING
Each person using this equipment must read and understand the information in this 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 adversely affect product performance.
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. For proper use, see supervisor or User
manual, or call Macurco Technical Service at 1-844-325-3050.
DVP-1200 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.
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 visual alarms. If
the self-test fails, or all the alarms do not activate, do not use 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.
Do not disassemble unit or attempt to repair or modify any component of this instrument. This
instrument contains no user serviceable parts, and substitution of components may adversely affect
product performance and void product warranty.
Use only for monitoring the gases which the sensors and equipment are designed to detect. Failure to
do so may result in exposures to gases not detectable and result in serious injury or death. For proper
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.

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2Use Instructions and Limitations
2.1 DVP-1200 General Description
The DVP-1200 controller in conjunction with Macurco gas detectors provide automatic control to help maintain an acceptable
environment in parking garages or other applications. The DVP-1200 offers an expandable system with up to 192 addressable
detectors in the field. This panel also has an additional four relay board option in addition to the existing standard four relay
boards. With three analog outputs, four 24vdc drivers and another option for up to two remote relays, the DVP-1200 will fit into
any gas detection application.
2.2 Remote Relay
The DVP-1200 incorporates an optional remote relay module (RR-24) that includes a set of two relays mounted in a single box
with an RS-485 interface. RR-24 communicates using standard Modbus protocol and can interface with Building Automation
Systems, Control Panels or other Control Devices that accept Modbus communications.
NOTE: RR-24 is not a UL 2017 listed product and was not evaluated by Intertek in conjunction with the operation of DVP-1200.
Macurco RR-24 is not intended for use in hazardous locations.
Following are additional specifications and features of RR-24.
-Power: 24 VDC @ 0.5 A max
-Operating Environment: -32oF to 104oF, 0% to 95% RH non-condensing
-Mounting Kit
-8-bit dip switch address selector
-RS-485 termination uses 4 pin connectors with jumper to select termination.
-Baud Rate: 4800, 9600, 19200 (default), 98400, 57600, 115200 bps
-Parity: Odd, Even (default) and None
-Intended for use in non-hazardous areas such as parking garages, warehouses, or other commercial facilities.
-Overlay LED indicates power and relay activation status.
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 detectors to a
digital Modbus signal for use with the DVP-1200 and other Macurco control panels.
The MRS-485 mounts to the back of a Macurco 6-Series detector installed on a 4”x 4” electrical box electrical box supplied by
the contractor. An external power source supplies power to the MRS-485 and the detector.
Complete instructions for the MRS-485 Modbus Adapter can be found at https://www.macurco.com/product/mrs-485/

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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)
•Three RS-485 digital input channels – 192 addressable sensors
•Up to 8 control zones can be defined
•Each zone can be controlled based on transducer signals and/or time of day
•Comes standard with four onboard 10A, 240 VAC SPDT Dry Contact relays
•Up to four optional onboard expansion relays available
•Up to 2 additional remote relays available
•Each relay is configurable with a delay before activation and minimum on time
•Fail-safe operation can be implemented
•Lockable NEMA 4X type enclosure
•Modular input and output connectors
•Ethernet connection for BACnet output (BACnet IP)
•USB connection
•Compatible with Macurco Commercial 6-Series gas detectors, MRS-485 adapter, Horn & Strobe Combo
•Four 24VDC Drivers for external Horn and Strobe
•Three 4-20mA output
•ETL Listed to UL 2017
2.5 Specifications
•Size: 13.0” x 10.0” x 2.75”
•Weight: 12.4 lb. (5.6 kg)
•Enclosure: NEMA 4X rated
•Operating Temperature: 32° to 104°F (0° to 40°C)
•Operating Humidity: 0% to 95% RH non-condensing
•Power Input: 100 – 240 VAC, 1 Amp, 50/60 Hz, single phase
•Relay Rating (4): SPDT, 120/240 VAC, 10 A Max (resistive)
•LCD Display: 320 x 240 Pixels Graphic LCD Display with backlight
•Status Indicators (LED): Power/Trouble, Hush, Warning/ALARM, and Relay
•Audible indicator: Internal buzzer, 90 dBA at 1ft
•External Drivers (4): 24VDC, maximum 250 mA
•Relay on Delay: 0 – 99 minutes in 1 second increments
•Relay Minimum Run Time: 0 – 99minutes in 1 second increments

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3Installation Instructions
3.1 Location & Mounting
The DVP-1200 should be installed in a centralized location, easy to access and protected from environmental elements. A
Mechanical room, Alarm Control Room, or other similar areas are recommended.
Mounting holes are provided in the DVP-1200 case at the four corners. See Figure 3-1. The panel should be mounted with 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 Back View

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3.2 Installation
3.2.1 General Wiring Information
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. For proper use, see supervisor or User
manual, or call Macurco Technical Service at 1-844-325-3050.
Field wiring is completed via modular connectors (provided), except for the safety ground, AC power, and relays. After wiring,
simply plug the modular connectors into the matching connectors on the printed circuit board (PCB).
Figure 3-2 – Typical Layout diagram
Note: It is recommended to always install with wires enclosed within the rigid metallic conduit.
The power to the remotely mounted sensors should be size AWG18 (minimum) for short runs. Refer to Table 3-1 for
recommended wire gauges.
Wire Gauge
Maximum Run Length
(feet)
(meters)
18
263
80
16
418
127
14
665
203
12
1058
322
Table 3-1 – Wire Gauge for run Length
Do not bundle sensor power or sensor signal connections with other AC power cables to prevent electrical interference. If other
AC power connections must be bundled with the DVP-1200 sensor cables, the sensor connections should be made with two

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twisted pairs of the appropriate gauge, with an overall foil and braid shield. All shields should be terminated at the DVP-1200
end of the cable only.
The power connections to the MRS-485 and remote mounted sensors should be size 18 AWG (minimum) for short runs. Refer to
Table 3 1 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 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 Installation Diagram
Figure 3-3 – DVP-1200 Board Diagram

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3.2.3 Power Connection
The main power cable should be routed into the bottom left conduit entry.
Macurco recommends a minimum wire size of 18 AWG and the wire insulator must be rated for at least 140°F (60°C) service.
The power connector will accept wire from 12-24 AWG.
The safety ground wire should be connected to terminal labeled as GND. Connect the wires to the following terminals:
Signal
Connector Label
Pin Label
Line (120/220/240/250 VAC)
AC~
L
Neutral
AC~
N
Ground
AC~
GND
Table 3-2 –
1. The line, neutral and ground wires should be stripped 1/4 in. (6.5 mm).
2. Press down the white button of the connector. You can use flat-headed screwdriver for this.
3. Insert the bare wire into the respective wire cavity of the connector. Refer Table 3-2.
4. Release the white button.
5. Ensure that the wire cannot be easily pulled from the connector.
Figure 3-4 – System Wiring Diagram
2

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Note: For ethernet connection, use surge protector (Model: DTK-MRJPOE manufactured by DITEK) and connect one end of the
surge protector to DVP-1200 ethernet connection.
3.2.4 Remote Sensor Connection
Remote sensors must be connected to the DVP-1200 at one of the three RS-485 connectors labeled “MRS-485 DETECTOR
CONNECTION”.
3.2.4.1 MRS-485 Connection and Operation
The Macurco MRS-485 Adapter converts the Macurco 6-Series 4-20mA analog output to a digital output for use with the DVP-
1200 and other addressable network systems.
To install the MRS-485 on a Macurco 6-Series detector,
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.
Figure 3-5 – MRS-485 Exploded View
Power connections to Macurco sensors used with the DVP-1200 are polarity-insensitive (no polarity) since a bridge rectifier is
connected to the power input terminals. All sensors used with the DVP-1200 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 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.

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When the LED is GREEN with random bursts of AMBER, the operation is normal, and data are being received or transmitted over
the RS-485 line. The AMBER LED will come on anytime that there is data traffic.
NOTE: After complete system installation, verify all sensors (verify sensor address and sensor type) connected to the panel are
detected by the panel and there is not any trouble indication for any of the connected detector.
3.2.4.2 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.
Figure 3-6 – MRS-485 Wiring Diagram
3.2.4.3 Dip Switches and Addressing
Each MRS-485 (and the detector it’s connected to) 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 192 (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 3-3) to ON or in the up
position (01001100).
NOTE: If CX-6 is assigned address X and connected to DVP-1200, then address X is assigned to NO2 Sensor (Type: 2) and address
X+1 is assigned to CO Sensor (Type: 1) by the panel.

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Figure 3-7 –
Address #
"On" Switches
Address #
"On" Switches
Address #
"On" Switches
Address #
"On" Switches
1 =
1
49 =
1, 5, 6
97 =
1, 6, 7
145 =
1, 5, 8
2 =
2
50 =
2, 5, 6
98 =
2, 6, 7
146 =
2, 5, 8
3 =
1, 2
51 =
1, 2, 5, 6
99 =
1, 2, 6, 7
147 =
1, 2, 5, 8
4 =
3
52 =
3, 5, 6
100 =
3, 6, 7
148 =
3, 5, 8
5 =
1, 3
53 =
1, 3, 5, 6
101 =
1, 3, 6, 7
149 =
1, 3, 5, 8
6 =
2, 3
54 =
2, 3, 5, 6
102 =
2, 3, 6, 7
150 =
2, 3, 5, 8
7 =
1, 2, 3
55 =
1, 2, 3, 5, 6
103 =
1, 2, 3, 6, 7
151 =
1, 2, 3, 5, 8
8 =
4
56 =
4, 5, 6
104 =
4, 6, 7
152 =
4, 5, 8
9 =
1, 4
57 =
1, 4, 5, 6
105 =
1, 4, 6, 7
153 =
1, 4, 5, 8
10 =
2, 4
58 =
2, 4, 5, 6
106 =
2, 4, 6, 7
154 =
2, 4, 5, 8
11 =
1, 2, 4
59 =
1, 2, 4, 5, 6
107 =
1, 2, 4, 6, 7
155 =
1, 2, 4, 5, 8
12 =
3, 4
60 =
3, 4, 5, 6
108 =
3, 4, 6, 7
156 =
3, 4, 5, 8
13 =
1, 3, 4
61 =
1, 3, 4, 5, 6
109 =
1, 3, 4, 6, 7
157 =
1, 3, 4, 5, 8
14 =
2, 3, 4
62 =
2, 3, 4, 5, 6
110 =
2, 3, 4, 6, 7
158 =
2, 3, 4, 5, 8
15 =
1, 2, 3, 4
63 =
1, 2, 3, 4, 5, 6
111 =
1, 2, 3, 4, 6, 7
159 =
1, 2, 3, 4, 5, 8
16 =
5
64 =
7
112 =
5, 6, 7
160 =
6, 8
17 =
1, 5
65 =
1, 7
113 =
1, 5, 6, 7
161 =
1, 6, 8
18 =
2, 5
66 =
2, 7
114 =
2, 5, 6, 7
162 =
2, 6, 8
19 =
1, 2, 5
67 =
1, 2, 7
115 =
1, 2, 5, 6, 7
163 =
1, 2, 6, 8
20 =
3, 5
68 =
3, 7
116 =
3, 5, 6, 7
164 =
3, 6, 8
21 =
1, 3, 5
69 =
1, 3, 7
117 =
1, 3, 5, 6, 7
165 =
1, 3, 6, 8
22 =
2, 3, 5
70 =
2, 3, 7
118 =
2, 3, 5, 6, 7
166 =
2, 3, 6, 8
23 =
1, 2, 3, 5
71 =
1, 2, 3, 7
119 =
1, 2, 3, 5, 6, 7
167 =
1, 2, 3, 6, 8
24 =
4, 5
72 =
4, 7
120 =
4, 5, 6, 7
168 =
4, 6, 8
25 =
1, 4, 5
73 =
1, 4, 7
121 =
1, 4, 5, 6, 7
169 =
1, 4, 6, 8
26 =
2, 4, 5
74 =
2, 4, 7
122 =
2, 4, 5, 6, 7
170 =
2, 4, 6, 8
27 =
1, 2, 4, 5
75 =
1, 2, 4, 7
123 =
1, 2, 4, 5, 6, 7
171 =
1, 2, 4, 6, 8
28 =
3, 4, 5
76 =
3, 4, 7
124 =
3, 4, 5, 6, 7
172 =
3, 4, 6, 8
29 =
1, 3, 4, 5
77 =
1, 3, 4, 7
125 =
1, 3, 4, 5, 6, 7
173 =
1, 3, 4, 6, 8
30 =
2, 3, 4, 5
78 =
2, 3, 4, 7
126 =
2, 3, 4, 5, 6, 7
174 =
2, 3, 4, 6, 8
31 =
1, 2, 3, 4, 5
79 =
1, 2, 3, 4, 7
127 =
1,2,3,4, 5, 6, 7
175 =
1, 2, 3, 4, 6, 8
32 =
6
80 =
5, 7
128 =
8
176 =
5, 6, 8
33 =
1, 6
81 =
1, 5, 7
129 =
1, 8
177 =
1, 5, 6, 8
34 =
2, 6
82 =
2, 5, 7
130 =
2, 8
178 =
2, 5, 6, 8
35 =
1, 2, 6
83 =
1, 2, 5, 7
131 =
1, 2, 8
179 =
1, 2, 5, 6, 8
36 =
3, 6
84 =
3, 5, 7
132 =
3, 8
180 =
3, 5, 6, 8
37 =
1, 3, 6
85 =
1, 3, 5, 7
133 =
1, 3, 8
181 =
1, 3, 5, 6, 8
38 =
2, 3, 6
86 =
2, 3, 5, 7
134 =
2, 3, 8
182 =
2, 3, 5, 6, 8
39 =
1, 2, 3, 6
87 =
1, 2, 3, 5, 7
135 =
1, 2, 3, 8
183 =
1, 2, 3, 5, 6, 8
40 =
4, 6
88 =
4, 5, 7
136 =
4, 8
184 =
4, 5, 6, 8
41 =
1, 4, 6
89 =
1, 4, 5, 7
137 =
1, 4, 8
185 =
1, 4, 5, 6, 8
42 =
2, 4, 6
90 =
2, 4, 5, 7
138 =
2, 4, 8
186 =
2, 4, 5, 6, 8
43 =
1, 2, 4, 6
91 =
1, 2, 4, 5, 7
139 =
1, 2, 4, 8
187 =
1, 2, 4, 5, 6, 8
44 =
3, 4, 6
92 =
3, 4, 5, 7
140 =
3, 4, 8
188 =
3, 4, 5, 6, 8
45 =
1, 3, 4, 6
93 =
1, 3, 4, 5, 7
141 =
1, 3, 4, 8
189 =
1, 3, 4, 5, 6, 8
46 =
2, 3, 4, 6
94 =
2, 3, 4, 5, 7
142 =
2, 3, 4, 8
190 =
2, 3, 4, 5, 6, 8
47 =
1, 2, 3, 4, 6
95 =
1, 2, 3, 4, 5, 7
143 =
1, 2, 3, 4, 8
191 =
1,2,3,4, 5, 6, 8
48 =
5, 6
96 =
6, 7
144 =
5, 8
192 =
7, 8

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Table 3-3 – Dip Switch Settings
3.2.4.4 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 Section 3.2.4.5 Line Termination – End of Line Resistor). The use of repeaters between several RS485-
MODBUS is also possible.
The DVP-1200 has three Modbus termination blocks 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”.
3.2.4.5 Line Termination – End of Line Resistor
The MRS-485 and DVP-1200 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-1200 provide integral termination for the end of line resistors
(EOL). The terminations use 4-pin connector with a jumper to select termination: The user selects no termination or one of the
two Modbus line termination options. The MRS-485 and DVP-1200 have two-line termination options (100 Ohm and 120 Ohm)
available.
Place the EOL jumper on one of the following positions:
N = No termination (default)
2 = 120 ohm
1 = 100 ohm
Figure 3-8 – EOL Jumper Settings
3.2.4.6 Baud Rate
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).

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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.
Figure 3-9 –
At 19200 baud rate (default), 1000 ft or less, and using RS-485 or Cat-5 type cable

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Figure 3-10 –
At 19200 baud rate (default), more than 1000 ft, and using RS-485 type cable
3.2.4.7 Wire Selection
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.
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.
3.2.4.8 Wire Length
For the RS485-MODBUS, the wire gauge must be chosen sufficiently wide to permit the maximum length (1000 m or 3281ft). 24
AWG is always enough for the MODBUS Data. The modular RS-485 connector will accept wire from 16 to 28 AWG. The wire
insulator must be rated for at least 140°F (60°C). Category 5 cables may operate for RS485-MODBUS, to a maximum length of
600 m 1968.5 ft.
The maximum length of the trunk cable depends on the
•baud rate
•cable (gauge, capacitance or characteristic impedance)
•number of loads on the daisy chain
•network configuration (2-wire)
For a maximum 9600 Baud Rate and 26 AWG (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.
3.2.4.9 Grounding
The Common Circuit (COM) must be connected directly to protective ground, preferably at one point only for the entire bus.
The shield should be connected to each detector at the SHD terminal and connected to a ground terminal or chassis only at one
end of the bus.
3.2.4.10 External Power Supply
Select a UL Listed NEC Class 2 power supply which can power the MRS-485 units connected to 6-Series detectors.
To determine the required minimum power supply,
•Each MRS-485 connected with a detector is rated at 3.25W.
•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.
3.2.4.11 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 18 AWG
(minimum) for short runs. Since Macurco detectors are rated for operation between 12 and 24 VDC or VAC, the voltage drop

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between the power supply and the MRS-485 should not be an issue if the recommended power wire gauge guidelines 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.
3.2.4.12 4-20mA Connection
There are three 4-20mA output modular connectors. The wire terminals for the three 4-20 mA connectors are available at the
connector labeled “4-20mA O/P”. The connector accepts wires from 16 to 28 AWG. Refer to Figure 3-4 for details.
3.2.4.13 Relay Connection
The wire terminals for the four onboard relays are available at the connectors labeled “R1”, “R2”, “R3”, and “R4”. The wire
terminals for the optional expansion relays are available at the connectors labeled “R5”, “R6”, “R7”, and “R8”.
Each relay will be wired to be either normally open (NO) or normally closed (NC). There is no polarity for these connections.
Each terminal can accommodate a wire size from 12 to 24 AWG.
Connect one wire to the COM terminal. For normally open (NO) configuration, connect the other wire to the NO terminal. For
normally closed (NC) configuration, connect the other wire to the NC terminal.
To connect wires to the relay terminals,
1. Strip each wire back 1/4 in. (6.5 mm).
2. Press down the white button of the connector.
3. Insert the bare wire into the wire cavity of the connector.
4. Release the white button.
5. Ensure that the wire cannot be easily pulled from the connector.
3.2.5 Remote Relay Connection
In addition to the onboard relays (four standard and four optional), the DVP-1200 can be connected to two additional remote
relays. Each remote relay box includes two relays.
The wire terminals for the Remote Relay are available at the connector labeled “REMOTE RELAY CONNECTION”.
Remote Relay (RR-24) Mounting:
Macurco RR-24 is shipped with mounting brackets and screws. Install mounting brackets on the back four corner of the
enclosure. RR-24 should be mounted with sufficient space all round for access to conduit entry holes provide on the top and
bottom side of the unit.
Remote Relay (RR-24) Wiring
All the connectors in RR-24 are spring tightening and will accept wire from 14 to 24 AWG. To connect the wires to terminals,
press down the white button of the connector (use flat-headed screwdriver), insert bare wire into respective wire cavity of the
connector and release the white button. Ensure that the wire cannot be easily pulled from the connector. Refer to figure below
for location of different connectors in RR-24.
The power connections to the RR-24 should be size AWG18 (minimum) for short runs. For longer run follow recommended
power wire gauge guidelines. Match the polarity for power connection.

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For RS-485 or communication connection it is recommended to always use a twisted wire 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) connection.
NOTE: Running the RS-485 cable adjacent to or in the same conduit with high voltage wires is not recommended as there may
be interference from the high voltages.
RR-24 provide integral termination for end of line resistors (EOL). The termination uses 4-pin connector (labeled J8) to select
termination. Place the EOL jumper on one of the following positions:
•NU = No termination (default)
•120 = 120 Ohm
•100 = 100 Ohm
Figure 3-11 - EOL Placement
Figure 3-12 – RR-24 Board Diagram
3.2.6 Remote Relay Operation
Power LED will light up green to indicate the unit is operational. TX LED will flash blue to indicate the unit is communicating with
DVP-1200. RELAY 1 and RELAY 2 LED will light up red when corresponding relay is activated. Refer to Figure above for location
of Relay 1 and Relay 2.