Spec Sheet
MRS-485 Specifications
• Power & Current (with detector): 3.25W (max) from 12 to 24 VAC or VDC,
85mA in alarm, 60mA fan relay on and 33mA stand by @ 24 VDC
• Shipping Weight: 0.25 lb (0.11 kg)
• Size: 3 1/2 x 2 x 1 3/4 in. (8.9 X 5.1 X 4.4 cm)
• Operating Environment : 0°F to 125° F (-18°C to +52°C),
10 to 90% RH non-condensing
• Connections: plugs/terminals
• Mounting screw and screwdriver included
• MRS-485 operates in the RTU Modbus Transmission Mode
• BaudRate: 4800, 9600, 19200 (default), 38400, 57600, 115200 bps
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.
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
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.
TYPICAL CONNECTION OF MRS-485
SIGNAL WIRE REQUIREMENTS
Note: It is recommended to always
use twisted wires and shielded cable
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.
6-Series Rear View
REMOTE 24V POWER SUPPLY
TRANSDUCER
POWER A B COM SHD
24 V RET
24 V
TRANSDUCER
POWER A B COM SHD
TRANSDUCER
POWER A B COM SHD
Installed MRS-485 View
Made in the U.S.A. with US and imported materials
© Aerionics 2015. All rights reserved.
Macurco is a trademark of Aerionics, Inc.
Made in the USA