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aci Room Series User Manual

Bacnet/modbus sensor
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USER'S GUIDE
Room Series
BACnet / Modbus
workaci.com
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Summary of Contents for aci Room Series

  • Page 1 USER’S GUIDE Room Series BACnet / Modbus workaci.com For latest product manuals: workaci.com/resources/resource-library...
  • Page 2 CONTACT Automation Components workaci.com/contact-us Telephone: 1-(888) 967-5224 Fax: (608) 831-7407 The information contained in this document is believed to be correct, but ACI accepts no liability for any errors it contains, and reserves the right to alter specifications without notice.

  • Page 3: Table Of Contents

    Table of Contents General Information ................4 1.1. Wiring Instructions ................4 1.2. Mounting Instructions .................5 BACnet MS/TP and Modbus RTU interface ........7 Baud Rate Selection ................8 EOL Termination Resistance Selection ..........9 Reset ......................9 LED Information ..................9 Address Selection ..................

  • Page 4: General Information

    General Information The BACnet MS/TP / Modbus RTU Room Series sensor is designed for use with electronic controllers in commercial heating and cooling building management systems. The ACI BACnet MS/TP / Modbus RTU Room Series sensor can be ordered to monitor temperature, RH, or temp/RH in Commercial Room environments.

  • Page 5: Mounting Instructions

    Table 1: Wiring Connections 1.2. Mounting Instructions ACI recommends using BELDEN 3105 for communication wiring. This wire has 120 ohm input impendence. The terminal blocks allow for (1) or (2) wires to be connected in each position for daisy chaining. Daisy chain the RS-485 wiring and do not use “Star”...
  • Page 6 Tighten the cover down, using the (2) 1.59 mm (1/16 in) Allen screws located in the bottom of the housing. A 1.59 mm (1/16 in) Hex driver is needed to secure the cover to the base. Room Series BACnet Modbus User's Guide...

  • Page 7: Bacnet Ms/Tp And Modbus Rtu Interface

    ACI’s BACnet sensors are master devices. Only master nodes are allowed to send and receive tokens on the MSTP network. ACI’s Modbus RTU sensors are slave devices. Only one master is connected to the bus and several slave nodes are connected to the same trunk.

  • Page 8: Baud Rate Selection

    Baud Rate SW 8 SW 9 SW 10 Auto-Baud 9600 19200 38400 57600 76800 115200 Table 2: BAUD Rate Selection Note Auto-Baud not available for Modbus RTU. Room Series BACnet Modbus User's Guide...

  • Page 9: Eol Termination Resistance Selection

    EOL Termination Resistance Selection RS-485 requires that the last device in a chain have a termination resistor. This is controlled using a jumper in the EN (enabled) position marked on Figure 5. When the jumper is set to EN (enabled), a resistance is added in parallel to the data line.

  • Page 10: Device Configuration Through Bacnet

    For temperature, the units of measure can be configured using BACnet. By writing to the units property of the temperature sensor (AI0), the reported temperature units can be changed. Table 4 shows the values to write. Room Series BACnet Modbus User's Guide...

  • Page 11: Temperature And Rh Offset

    Units Value °F °C Table 4: Unit Settings 8.7. Temperature and RH Offset This device allows for a temperature offset of ± 5 °C (9 °F) and an RH offset of ± 10 %. By default, these values are set to 0, meaning no offset is added.

  • Page 12: Device Configuration Through Modbus Rtu

    Modbus Slaves. The Modbus sensors are slave devices and the number of Data Bits needs to be the same as in the Master device configuration. ACI’s Modbus RTU sensors utilize 8 data bits during communication exchange. Parity and stop bit selection is performed via the SW4 switch located on the board.

  • Page 13: Modbus Rtu Map

    9.4. Modbus RTU Map Reference Address Name Description Coils (CL) 0 = Disable Test Mode. IR3 and IR4 will read with current Sensor Value. 1001 1000 Test Mode Enable 1 = Enable Test Mode. IR3 and IR4 will read with the values stored in HR1001 and HR1002.
  • Page 14 CL1001. For Example -400 would be -40.0. User can set what RH value Test Mode RH (Tenths) that would be returned 1002 1001 Value when reading IR4 and Test Mode is Enabled in CL1001. Room Series BACnet Modbus User's Guide...

  • Page 15: Product Specifications

    Device Name, Device Location, and Device Description are 9001 9000 user settable character strings through through Device Name (Null terminated) that can 9016 9015 be used to allow for system customization and device identification. 9017 9016 For example: through through Device Location Device Name (Modbus 9001 9048...
  • Page 16 WARRANTY The ACI BACnet and Modbus RTU Room Series temperature sensors are covered by ACI’s Five (5) Year Limited Warranty, which is located in the front of ACI’S SENSORS & TRANSMITTERS CATALOG or can be found on ACI’s web site: workaci.com.
  • Page 17 workaci.com I0000926 Improving the world, one measurement at a time. UNIVERSAL FLOW MONITORS...

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