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Macurco MRS-485 MRS-485-Modbus RS-485 Adapter for use with Macurco 6-Series Detectors
Macurco MRS-485 MRS-485-Modbus RS-485 Adapter for use with Macurco 6-Series Detectors

Macurco MRS-485 MRS-485-Modbus RS-485 Adapter for use with Macurco 6-Series Detectors

Manufacturer Part#:70-2900-0012-1
Our Part#:70-2900-0012-1
Stock Status: Call for Availability
Retail Price:$165.33
Your Savings:$24.80(15%)
Your Price:$140.53







Feature 5


Feature 7

Detection Type:Ammonia,Carbon Monoxide,Hydrogen,Hydrogen Sulfide,Methane,Nitrogen Dioxide,Propane,Oxygen,Refrigerant|Product Type:Accessory|Input Voltage:12VAC,12VDC,24VAC,24VDC|Intended Use:Commercial/Industrial|Connection Type:System|Product Status:Current|Battery Backup:No


  • The MRS-485 monitors sensor type, gas level and trouble status communications
  • Communication is on a Modbus serial line
  • Commercial type enclosure to protect and support the electronics
  • Tricolor LED indicates power, test and communication status
  • Mounts behind the detector inside of a standard 4" x 4" electrical box
  • Held in place on the back of the 6-Series detector with a single screw
  • 8 bit dip switch address selector


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 multi-point 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 has the ability to interface with Building Automation Systems, Control Panels or other Control Devices that accept Modbus communications.

By using the Macurco MRS-485 Modbus adapter and 6-Series detectors, the DVP-120M can control up to 87 addressable gas detectors.

Gas Detection

The Macurco MRS-485 Adapter converts the Macurco 6-Series 4-20mA analog output to a digital output for use with addressable network systems. The Macurco 6-Series is a family of fully programmable, low voltage, dual relay gas detectors, controllers and transducers for BAS, HVAC and Fire & Security applications.

The 6-Series detectors are used to measure the concentration of various gas and provide feedback and automatic control to help ensure a safe environment: Carbon Monoxide, Methane, Propane, Hydrogen, Nitrogen Dioxide and other gases.


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 circuits 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.


Power & Current (with detector) 3.25W (max) from 12 to 24VAC or VDC, 85mA in alarm, 60mA fan relay on and 33mA stand by @24VDC
MRS-485 Operation RTU Modbus Transmission Mode
Baud Rate4800, 9600, 19200 (default), 38400, 57600, 115200 bps
Size3.5" x 2" x 1.75" (8.9 x 5.1 x 4.4 cm)
Operating Environment0° to 125°F (-18° to 52°C), 10 to 90% RH non-condensing
Shipping Weight0.25 lb (0.11 kg)

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