Related Manuals for Macurco MRS-485
Summary of Contents for Macurco MRS-485
- Page 1 Macurco™ MRS-485 Modbus® RS-485 Adapter User Instructions IMPORTANT: Keep these user instructions for reference.
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Page 2: Table Of Contents
Macurco MRS-485 Modbus RS-485 Adapter Table of Contents General Safety Information ........................4 List of warnings ..........................4 Use Instructions and Limitations ......................4 Use For ............................5 Do NOT use for ..........................5 Features ............................5 Specifications ..........................6 Installation Instructions.......................... - Page 3 Testing ..............................19 Operation Test ..........................20 Manual Operation Test ......................... 21 Appendix A – Table of Figures ......................22 Macurco Gas Detection Product Limited Warranty ................23 Technical Support Contact Information ......................24 General Contact Information ......................... 24 REV – 1.0...
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Page 4: General Safety Information
The Macurco MRS-485 simply connects to 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. -
Page 5: Use For
Do not mount the MRS-485 where the normal ambient temperature is below 0°F or exceeds 125°F (- 18°C or above 52°C). The MRS-485 mounts to a Macurco 6-Series detector installed on a 4” x 4” electrical box electrical box supplied by the contractor. -
Page 6: Specifications
The following instructions are intended to serve as a guideline for the use of the Macurco Modbus RS-485 Adapter MRS-485. It is not to be considered all-inclusive, nor is it intended to replace the policy and procedures for each facility. If you have any doubts about the applicability of the equipment to your situation, call Technical Service at 1-877-367-7891. -
Page 7: Location
Macurco MRS-485 Modbus RS-485 Adapter Location Refer to the user instructions of the specific Macurco 6-Series gas detector to which the MRS-485 will be connected. Installation The Macurco MRS-485 Adapter converts the Macurco 6-Series 4-20mA analog output to a digital output for use with addressable network systems. -
Page 8: Connection
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. -
Page 9: Wiring
Macurco MRS-485 Modbus RS-485 Adapter Figure 3-2 Connection Expanded Wiring 3.4.1 Signal Wire 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 RS- 485-Modbus must use a balanced pair (for A &... -
Page 10: Topology
Macurco MRS-485 Modbus RS-485 Adapter 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. -
Page 11: Length
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 below are followed. The terminals will accept wire from 16 to 28 AWG. -
Page 12: Configuration
Dip Switches and Addressing The DIP switches are used to set the Modbus address and are also used to change the MRS-485 settings. Valid Modbus addresses are between 1 and 247 where switch 1 is the least significant bit (LSB) and switch 8 is the most significant bit (MSB). -
Page 13: Changing Mrs-485 Settings
Changing MRS-485 Settings The DIP switches are used to set the Modbus address and are also used to change the MRS-485 settings. Valid Modbus addresses are between 1 and 247 where switch 1 is the least significant bit (LSB) and switch 8 is the most significant bit (MSB). - Page 14 Table 4-3 Parity Configuration Registration mode can be latched or unlatched. MRS-485 is always using data from a valid registration but when registration is latched it will also compare the saved value with the new one and set a flag if it is different. This way, by reading the flag, you can check if it is a different sensor type and you always get data about the sensor present.
- Page 15 Macurco MRS-485 Modbus RS-485 Adapter Registration is latched Do not change Table 4-4 Registration Configuration Set the switches to the desired value and then set switch 1 to ON and then OFF and the new settings will be saved in EEPROM.
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Page 16: Operations
The MRS-485 is an adapter which allows the reading of a 6-Series gas detector over a Modbus interface. To achieve this, 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. -
Page 17: 4-20Ma Loop
4-20mA Loop The 4-20mA Loop must be enabled “ON”, the 6-Series detector. If the 4-20mA loop has been disabled “OFF” the 6-series detector will not be able to send the signal information to the MRS-485 to be converted to Modbus data. -
Page 18: Error Codes
Solid RED - The MRS-485 detected an error and no Modbus communications are in progress. RED with random bursts of AMBER - The MRS-485 detected an error and AMBER is displayed when data are received or transmitted over the RS-485 line There are a number of conditions which are signalized in this way: •... -
Page 19: Maintenance
Testing The Macurco MRS-485 adapter converts the 4-20mA analog signal from Macurco 6-Series type detectors to a digital signal for use with multipoint addressable systems. The 6-Series test procedures may be used to ensure that the MRS-485 accepts the 4-20mA output for the Modbus communications. All 6-Series detectors are factory calibrated and 100% tested for proper operation. -
Page 20: Operation Test
Check that the detector operating LED light is illuminated Green continuously. If not, do not proceed with the tests. If the unit is in error mode, contact your local representative or Macurco technical service representative for information on resolving the problem. -
Page 21: Manual Operation Test
Macurco MRS-485 Modbus RS-485 Adapter When testing is completed, reassemble the unit or units Manual Operation Test This option gives the user the opportunity to manually initiate an individual test for the audible buzzer, each relay, the analog output and the sensor response to gas. From normal operation mode, press the Next button 2 times to get to the Test Mode (tSt). -
Page 22: Appendix A - Table Of Figures
Macurco MRS-485 Modbus RS-485 Adapter Appendix A – Table of Figures Figure 3-1 MRS-485 Installation Expanded ......................7 Figure 3-2 Connection Expanded .......................... 9 Figure 3-3 Modbus Wiring ..........................10 Table 3-1 Power Wire lengths ..........................12 Figure 4-1 Dip Switches (displayed to “50”) ......................12 Table 4-1 Dip Switch Settings .......................... -
Page 23: 10 Macurco Gas Detection Product Limited Warranty
10 Macurco Gas Detection Product Limited Warranty Macurco warrants the MRS-485 Adapter will be free from defective materials and workmanship for a period of two (2) years from date of manufacture (indicated on the cover of the MRS-485), provided it is maintained and used in accordance with Macurco instructions and/or recommendations. -
Page 24: Technical Support Contact Information
Email: support@macurco.com Email : info@macurco.com Website: www.support.macurco.com Website: www.macurco.com Rev – 1.0 Issue Date: 2/6/2019 Document No: 34-2900-0019-8 © Aerionics 2018. All rights reserved. Macurco is a trademark of Aerionics, Inc. REV – 1.0 [34-2900-0019-8] 24 | P a g e...