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CommStat
4
Modbus Interface Adapter
Installation and Operation Manual
Modbus RTU
Manufactured By:
Marvair
, An AirX Climate Solutions Brand
®
P.O. Box 400 • Cordele, Georgia 31010
156 Seedling Drive • Cordele, Georgia 31015
(229) 273-3636 • Fax (229) 273-5154
E-mail:
marvairsales@airxcs.com
• Internet: www.marvair.com
The most current version of this manual can be found at
www.marvair.com.
P/03272
12/2021 rev.5
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Table of Contents
Summary of Contents for ACS Marvair CommStat 4
- Page 1 ™ CommStat Modbus Interface Adapter Installation and Operation Manual Modbus RTU Manufactured By: Marvair , An AirX Climate Solutions Brand ® P.O. Box 400 • Cordele, Georgia 31010 156 Seedling Drive • Cordele, Georgia 31015 (229) 273-3636 • Fax (229) 273-5154 E-mail: marvairsales@airxcs.com •...
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Page 2: Important Safety Information
® ™ This manual describes the steps to install and operate the Marvair CommStat 4 Modbus Interface Adapter. This device provides both Ethernet and serial interfaces to allow a remote system to read and write parameters to the ™ CommStat 4 controller through the Modus TCP or Modbus RTU communications protocol. -
Page 3: General Description
™ CommStat Modbus Adapter Installation & Operation General Description ® The self-contained Marvair Modbus Interface Adapter provides an Ethernet or a serial gateway to the ™ Marvair CommStat HVAC controller through which an external host can read and write information from the CommStat 4 as if it were a Modbus TCP or Modbus RTU device. - Page 4 ™ CommStat Modbus Adapter Installation & Operation Figure 1: Modbus Interface Adapter External Connections Figure 2: Modbus Interface Adapter Power LED Page 4...
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Page 5: Ip Address Configuration
™ CommStat Modbus Adapter Installation & Operation ™ Figure 3: CommStat to Modbus Interface Adapter Connection IP Address Configuration The adapter has a default static IP address of 192.168.1.19. If a different IP address is required a laptop can be used to re-configure the adapter. In order to establish communications, the laptop must have and IP address within the same subnet as the adapter. - Page 6 ™ CommStat Modbus Adapter Installation & Operation Click Change adapter settings: Figure 5: Network and Sharing Center Right-click on the Local Area Connection and select Properties from the drop down menu: Figure 6: Local Area Connection Properties Page 6...
- Page 7 ™ CommStat Modbus Adapter Installation & Operation Click Internet Protocol Version 4 (TCP/IPv4) then click the Properties key: Figure 7: Internet Protocol Version 4 (TCP/IPv4) Properties If there are values in any of the IP address fields on this screen, record these addresses prior to implementing any changes so that the original values can be restored after the adapter has been updated.
- Page 8 ™ CommStat Modbus Adapter Installation & Operation Plug the Ethernet cable from the adapter into the RJ45 port of the laptop. Open an Internet browser (Internet Explorer, Chrome, Firefox, Safari) and type http://192.168.1.19 into the address bar. The adapter network configuration page will then be displayed.
- Page 9 ™ CommStat Modbus Adapter Installation & Operation CommStat ™ 4 Modbus Read Registers The adapter supports Modbus TCP/IP read requests from the Master system through port 502 of the configured IP address of the interface adapter. The read registers are detailed in the table below. Register Source Value...
- Page 10 ™ CommStat Modbus Adapter Installation & Operation Register Source Value Description Comments 40032 Master Setting #31 Stage 7 differential See CommStat 4 manual 40033 Master Setting #32 Stage 8 differential See CommStat 4 manual 40034 Master Setting #33 Stage 9 differential See CommStat 4 manual 40035...
- Page 11 ™ CommStat Modbus Adapter Installation & Operation Notes: Note Description Bit<7:5> are always clear; if bit<4> is set, controller senses smoke; if bit<3> is set, controller senses high hydrogen level; if bit<2> is set, controller senses generator being used; if bit<1> is set, controller senses aux 1 signal present; if bit<0>...
- Page 12 ™ CommStat Modbus Adapter Installation & Operation Notes: Note Description If value is 0, it is in stage 12 cooling; if value is 1, it is in stage 11 cooling; if value is 2, it is in stage 10 cooling; if value is 3, it is in stage 9 cooling;...
- Page 13 ™ CommStat Modbus Adapter Installation & Operation CommStat ™ 4 Modbus Write Registers The adapter supports Modbus TCP/IP write requests from the Master system through port 502 of the configured IP address of the interface adapter. The write registers are detailed in the table below. Register Source Value...
- Page 14 ™ CommStat Modbus Adapter Installation & Operation Register Source Value Description 40131 Remote Setting #31 Stage 7 differential 40132 Remote Setting #32 Stage 8 differential 40133 Remote Setting #33 Stage 9 differential 40134 Remote Setting #34 Stage 10 differential 40135 Remote Setting #35 Stage 11 differential...
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Page 15: Technical Specifications
™ CommStat Modbus Adapter Installation & Operation Technical Specifications Electrical Voltage: 24VDC to 60VDC (nominal 24VDC or 48VDC) Current: 1A typical Environmental Temperature: -30C (-22F) to 70C (158F) Relative Humidity: 0% to 95%, non-condensing Mechanical Dimensions: 10.00 inches x 6.00 inches x 3.00 inches (25.40 cm x 15.24 cm x 7.62 cm) Weight: 1.37 lbs (0.62 kg) ®... - Page 16 ™ CommStat Modbus Adapter Installation & Operation CommStat ™ 4 Interface RJ11 Connector ™ The female RJ11 socket CommStat interface terminal block has the following pinout: Label Ground RS-485 RX/TX A RS-485 RX/TX B Figure 13: RJ11 Connector Pinout Ethernet RJ45 Connector The female RJ45 socket provides the Ethernet connection for the Master system.
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Page 17: Dimensional Drawings
™ CommStat Modbus Adapter Installation & Operation Dimensional Drawings Figure 15: Adapter Enclosure Dimensions-1 Page 17... - Page 18 ™ CommStat Modbus Adapter Installation & Operation Figure 16: Adapter Enclosure Dimensions-2 Page 18...
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