Sierra QuadraTherm 640i Instruction Manual
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Sierra QuadraTherm 640i Instruction Manual

Thermal mass flow meters
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QuadraTherm
®
640i & 780i Modbus
Instruction Manual
Modbus Interface Specification for Models: 640i & 780i
Thermal Mass Flow Meters
Part Number: IM640i/780i-Modbus Rev. V1
November 2013

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Summary of Contents for Sierra QuadraTherm 640i

  • Page 1 QuadraTherm ® 640i & 780i Modbus Instruction Manual Modbus Interface Specification for Models: 640i & 780i Thermal Mass Flow Meters Part Number: IM640i/780i-Modbus Rev. V1 November 2013...
  • Page 2 IMPORTANT CUSTOMER NOTICE- OXYGEN SERVICE Sierra Instruments, Inc. is not liable for any damage or personal injury, whatsoever, resulting from the use of Sierra Instruments standard mass flow meters for oxygen gas. You are responsible for determining if this mass flow meter is appropriate for your oxygen application.
  • Page 3 Warnings and Cautions Warning! Agency approval for hazardous location installations varies between flow meter models. Consult the flow meter nameplate for specific flow meter approvals before any hazardous location installation. Warning! Hot tapping must be performed by a trained professional. U.S. regulations often require a hot tap permit. The manufacturer of the hot tap equipment and/or the contractor performing the hot tap is responsible for providing proof of such a permit.
  • Page 4 Series product manual. If the problem persists after following the troubleshooting procedures outlined in the 640i or 780i product manuals, contact Sierra Instruments by fax or by e-mail (see inside front cover). For urgent phone support, you may call (800) 866-0200 or (831) 373-0200 between 8:00 a.m.

  • Page 5: Table Of Contents

    Table of Contents Chapter 1- Introduction .......................... 6 Chapter 2 - Electrical Connections ......................7 RS-485 Connection ........................... 7 General 2-Wire Topology RS-485 Network ....................8 Chapter 3 - Communicating ......................... 10 Data Format Type for Various Registers ....................10 Modbus Registers Overview ........................

  • Page 6: Chapter 1- Introduction

    Multipliers to change data to/from integer. 10, 100, 1000, 256 ... The Modbus interface discussed in this manual is an option for Sierra’s QuadraTherm 640i and 780i four-sensor thermal mass flow meters. The interface makes it possible to connect the QuadraTherm to a Modbus network and remotely operate it.

  • Page 7: Chapter 2 - Electrical Connections

    Chapter 2 - Electrical Connections All electrical connections are made on the terminal board inside the QuadraTherm enclosure. Instrument Power Connection DC Power - DC Power + Power supply requirements for the QuadraTherm are the following: Voltage: 24 VDC +/- 10%, Amperage: 1.1 A RS-485 Connection Caution!

  • Page 8: General 2-Wire Topology Rs-485 Network

    RS485 A RS485 B RS485 common + Connecting the RS-485 to Your QuadraTherm 1. Connect the 2-wire RS-485 A (+) to the A terminal and the 2-wire RS-485 B (+) to the B termnal. 2. Connect the RS-485 common (sheild) to the Modbus Sheild on terminal 16. 3.
  • Page 9 The “RS-485 – A” (also referred as ‘-‘) is connected with the D0 line. The “RS-485 – B” (also referred as ‘+‘) is connected with the D1 line. The common is the DC reference connected to the common line of the network. If a 2-wire shielded cable is used, this common may be connected to the shield braid.

  • Page 10: Chapter 3 - Communicating

    Chapter 3 - Communicating Once the flow meter is wired to the network and powered up, it is time to communicate with it. The factory default settings for the Modbus interface are as follows:  ID code = 1  Baud rate = 19200 ...
  • Page 11 40031 Pressure units 16 bits ASCII 40034 40035 Pressure unit - index integer 40036 Standard Temperature - low word 32 bits real 40037 Standard Temperature - high word 40038 Standard Temperature - index integer 40039 Standard pressure - low word 32 bits real 40040 Standard pressure - high word...
  • Page 12 40084 Flow correction – low word 32 bits real 40085 Flow correction – high word 40086 Totalizer enable integer 40087 Totalizer buck – low word 32 bits real 40088 Totalizer buck – high word 40089 Totalizer pulse width integer 40090 Totalizer reset integer 40091...

  • Page 13: Registers Explained

    Registers Explained The registers are divided into two groups. The first group (40001 – 40009) represents the dynamic data and changes the most of the two groups. The second group (40010 – 40131) contains the settings of the flow meter. Caution! To fully understand the registers and their functions, we suggest you also read the QuadraTherm instruction manual.
  • Page 14 40023: Flow Unit Index This value shows which flow unit is selected on the instrument. The value can range between 0 and 49:     0 – SCFS 13 – SM3/Day 26 – NLPM 39 –Kg/Year   ...
  • Page 15 40031: Pressure Unit ASCII string shows the currently selected pressure unit on the instrument. Use register 40035 to select a different unit 40035: Pressure Unit Index Value shows which pressure unit is selected on the instrument:   0 – PSIA 4 –...
  • Page 16 Caution! Registers 40048 to 40060 only affect the three 4-20mA outputs on the meter, and have no effect on the Modbus data. 40048: Flow - 4ma Tuning DAC value that represents 4 mA for the flow output 40049: Flow - 20ma Tuning DAC value that represents 20 mA for the flow output 40050: Temperature - 4ma Tuning DAC value that represents 4 mA for the temperature output...
  • Page 17 Caution! Only one alarm can be active when the instrument is online. 40063: Alarm Mode Value indicates the mode of the current active alarm (flow, temperature, pressure or totalizer):  0 – Alarm set to “Low” mode  1 – Alarm set to “High” mode ...
  • Page 18  3 – Stainless steel -normal  4 – Stainless steel -rough  5 – Carbon steel -smooth  6 – Carbon steel -normal  7 – Carbon steel -rough  8 – Carbon-fiber  9 – Cast-iron  10 – Concrete 40083: Pipe Diameter Units Value indicates the current pipe diameter units: ...
  • Page 19 40093: Normal Temperature Unit ASCII string shows the temperature unit of the normal temperature:     40094: Standard Pressure Unit ASCII string shows the pressure unit of the standard pressure:  Psia  Psig  Bar A  Bar G ...
  • Page 20 40104: Pipe Roughness Description ASCII string shows the selected pipe roughness:   Glass  Stainless steel-smooth  Stainless steel -normal  Stainless steel -rough  Carbon steel -smooth  Carbon steel -normal  Carbon steel -rough  Carbon-fiber  Cast-iron ...

  • Page 21: Chapter 4 - Bootloader

    Chapter 4 – Bootloader Introduction This chapter describes how the bootloader is used. The boot loader makes it possible to set up the Modbus interface and download the instrument firmware using a simple terminal program and a serial connection. Getting Started In order to use the bootloader, a PC equipped with a 2-wire RS-485 interface is required.

  • Page 22: Load Firmware

    When the bootloader is successfully activated, the following menu will be presented on the screen: On the menu, the version of the bootloader is shown with three options. Select what action you want to take, by entering either “1”, “2” or “3.” Load Firmware 1.
  • Page 23 5. A pop up window entitled “Send File” will open as shown below. Use this screen to get the file to be transferred. 6. Click the “Browse” button to select the file to download to your device. Caution! Only files with the “.hex” extension can be downloaded to the unit. 7.

  • Page 24: Setup Firmware

    Early termination of the download can corrupt the firmware already loaded. Once the download has started, you should not stop it. Stopping the download will result in corruption the current application. The download is now in progress… 9. When the download is finished, the start-up menu screen will appear again presenting three the original three options: 1) Load Firmware, 2) Setup Firmware, and 3) Quit.

  • Page 25: Quit

    Pressing the “C” key will prompt for a new value. Enter a new value and press the “Enter” key. The new value will be stored, and the next option will be presented (if available). Data which can be entered must match the type presented. So, in the above example, only numbers (1, 2, 3, etc.) can be entered.

  • Page 26: Troubleshooting

    Troubleshooting Problem Solution During the firmware transfer, the download has halted Reset the unit and try again. Make sure that only .hex and nothing is happening anymore (or an error files intended for the unit are selected. message appears) When trying the enter data, the length is limited. No For each option, the data type and length are more data is accepted predefined.

This manual is also suitable for:

Quadratherm 780i

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