Baker Hughes Panametrics XMT686i User manual

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916-115 F
JUL 2021
Communications Options
User’s Guide

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Copyright 2021 Baker Hughes company.
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Communications Options
User’s Guide
916-115 F
JUL 2021

ii
[no content intended for this page]

Communications Options User’s Guide iii
Contents
1. Modbus Communications
1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.2 Installing the MODBUS Option Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.3 Setting Up MODBUS Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.4 MODBUS Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4.1 Notes for a Gas Flowmeter: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.4.2 Notes for a Liquid Flowmeter: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
1.4.3 Notes for a Sentinel Flowmeter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
1.5 Swapping the Floating Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2. Modbus Over Ethernet Communications 1
2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.2 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
2.2.1 Finding the Assigned IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2.2.2 Changing the Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
2.2.3 Changing IP Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
3. Modbus Over Ethernet Communications 2
3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.2 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
3.2.1 Downloading the Digi Device Discovery Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.2.2 Module LED Behaviors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
3.2.3 Default Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
3.2.4 Finding the Assigned IP Address. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.2.5 Changing IP Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
3.2.6 Changing Modbus/TCP Network Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
3.2.7 Changing User’s Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
4. Ethernet Only Communications
4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.2 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
4.2.1 Downloading the Digi Device Discovery Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.2.2 Module LED Behaviors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.2.3 Default Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.2.4 Finding the Assigned IP Address. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
4.2.5 Changing IP Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
4.2.6 Changing User’s Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
5. Modbus Over WI-FI Communications
5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
5.2 WI-FI Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
5.3 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
5.3.1 Downloading the Digi Device Discovery Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
5.3.2 Module LED Behaviors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
5.3.3 Default Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
5.3.4 Finding the Assigned IP Address. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
5.3.5 Changing IP Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
5.3.6 Changing Modbus/TCP Network Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
5.3.7 Changing User’s Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
5.4 Tips for Improving Wireless Data Communications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
6. WI-FI Only Communications
6.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
6.2 WI-FI Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Contents
iv Communications Options User’s Guide
6.3 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
6.3.1 Downloading the Digi Device Discovery Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
6.3.2 Module LED Behaviors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
6.3.3 Default Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
6.3.4 Finding the Assigned IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
6.3.5 Changing IP Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
6.3.6 Changing User’s Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
6.4 Tips for Improving Wireless Data Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
7. Foundation Fieldbus Communications
7.1 Optional Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
7.2 Configuration Utility Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
7.3 Selecting the Desired Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
7.4 Selecting Units for AI Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
7.5 Resetting Instrument Totalizers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
7.6 Function Block Application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
7.7 NAMUR NE107 Recommended Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
8. HART Communications
8.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
8.2 Installing the HART Option Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
8.3 Flowmeter Software Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
8.4 Using the HART Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
8.4.1 Unit Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
8.4.2 HART Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
8.5 List of Programmable Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
9. BACNet/IP (BACNet Over Ethernet)
9.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
9.2 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
9.3 Adding Information to the Monitor List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85

Communications Options User’s Guide v
Preface
Information Paragraphs
Note: These paragraphs provide information that provides a deeper understanding of the situation, but is not
essential to the proper completion of the instructions.
IMPORTANT: These paragraphs provide information that emphasizes instructions that are essential to proper setup
of the equipment. Failure to follow these instructions carefully may cause unreliable performance.
Safety Issues
Auxiliary Equipment
Local Safety Standards
The user must make sure that he operates all auxiliary equipment in accordance with local codes, standards,
regulations, or laws applicable to safety.
Working Area
CAUTION! This symbol indicates a risk of potential minor personal injury and/or severe damage to
the equipment, unless these instructions are followed carefully.
WARNING! This symbol indicates a risk of potential serious personal injury, unless these
instructions are followed carefully.
WARNING! It is the responsibility of the user to make sure all local, county, state and national
codes, regulations, rules and laws related to safety and safe operating conditions are
met for each installation.
WARNING! For installations in potentially hazardous areas, be sure to read the Certification and
Safety Statements document at the end of this manual before beginning the
installation.
WARNING! Auxiliary equipment may have both manual and automatic modes of operation. As
equipment can move suddenly and without warning, do not enter the work cell of this
equipment during automatic operation, and do not enter the work envelope of this
equipment during manual operation. If you do, serious injury can result.
WARNING! Make sure that power to the auxiliary equipment is turned OFF and locked out before
you perform maintenance procedures on the equipment.

Preface
vi Communications Options User’s Guide
Qualification of Personnel
Make sure that all personnel have manufacturer-approved training applicable to the auxiliary equipment.
Personal Safety Equipment
Make sure that operators and maintenance personnel have all safety equipment applicable to the auxiliary
equipment. Examples include safety glasses, protective headgear, safety shoes, etc.
Unauthorized Operation
Make sure that unauthorized personnel cannot gain access to the operation of the equipment.
Environmental Compliance
Waste Electrical and Electronic Equipment (WEEE) Directive
Baker Hughes is an active participant in Europe’s Waste Electrical and Electronic Equipment (WEEE) take-back
initiative, directive 2012/19/EU.
The equipment that you bought has required the extraction and use of natural resources for its production. It may
contain hazardous substances that could impact health and the environment.
In order to avoid the dissemination of those substances in our environment and to diminish the pressure on the
natural resources, we encourage you to use the appropriate take-back systems. Those systems will reuse or recycle
most of the materials of your end life equipment in a sound way.
The crossed-out wheeled bin symbol invites you to use those systems.
If you need more information on the collection, reuse and recycling systems, please contact your local or regional
waste administration.
Visit www.bakerhughesds.com/health-safetyand-environment-hse for take-back instructions and more information
about this initiative.

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Communications Options User’s Guide 1
Chapter 1. Modbus Communications
1. Modbus Communications
1.1 Introduction
Your flowmeter hardware and software (GC3E.MBS) have been modified to provide improved MODBUS
communications. The MODBUS option card provides an RS485 interface with a host system, while the main circuit
board continues to support RS232 communications for use with a PC running PanaView™ software.
Note:
PanaView™ does not support Modbus.
To properly set up the instrument, use this addendum along with the standard flowmeter User’s Manual . This
document shows how to install the MODBUS option card and how to program the modified flowmeter to access this
special feature.
When equipped with the optional MODBUS output card, the flow transmitter can send flow data and diagnostic
information to a flow computer (or SCADA) serially, using a Gould-type RTU protocol. In this case, only the MODBUS
function command, 3 (read multiple registers), 6 (write multiple registers) is valid. The format for the data exchange
is as follows:
• The send command (initiated by the host flow computer or controller) comes in the form:
[time delimiter]<Addr><3><First Register MSB>
<First Register LSB><Register Count MSB>
<Register Count LSB><CRC Low><CRC High>[time delimiter]
• The response (initiated by the host flow computer or controller) comes in the form:
[time delimiter]<Addr><3><Byte count><Data.........>
<CRC Low><CRC High>[time delimiter]
The format for the returned data types is as follows:
• Integer (16 bit Integer) <MSB><LSB>
1 Register - 16 bit integer
• Integer (32 bit IntegerI) <MSB><LSB><LSB><LSB>
2 Registers - 32 bit long integer
• Floating Point (FP) <EXP><MAN><MAN><MAN>
2 Registers - 32 bit IEEE floating point number

Chapter 1. Modbus Communications
2 Communications Options User’s Guide
1.2 Installing the MODBUS Option Card
IMPORTANT: The installation information presented here supersedes the information in the standard flowmeter
User’s Manual.
The modified flowmeter uses the RS485 standard for MODBUS communications. This standard allows up to 32 nodes
(drivers and receivers) on one multidrop network, at distances up to 4,000 ft (1,200 m). To connect the instrument(s)
to the host system, Panemetrics recommends using a 24-gauge (24 AWG) twisted-pair cable with a characteristic
impedance of 120 ohms and a 120-ohm termination at each end of the communications line.
The MODBUS option card must be plugged into either slot 5 or slot 6 of the flowmeter. On the option card, pin 1 is the
[TMT-] inverting or negative connection and pin 2 is the [TMT+] non-inverting or positive connection. To link the
flowmeter to the control system, connect the two wires of the twisted-pair cable from these terminals to the
corresponding terminals at the control system.
Note:
If two MODBUS option cards are installed in the flowmeter, only the card in slot 5 is activated.
1.3 Setting Up MODBUS Communications
To set up MODBUS communications, enter the User Program as described in your Programming Manual . Then, refer to
the
menu map in Figure 2 on page 21 and complete the following steps:
Note:
Any time the following settings are changed, the flowmeter must be rebooted to load the new settings into
the option card.
IMPORTANT:
The serial port settings of the flowmeter must match those of the MODBUS control system.
The available RS232 baud rates are 300, 600, 1200, 2400, 4800, 9600, and 19200.
PROGRAM Start Press the [ key and then the
[F3] key to select the
COMM
submenu. (On a two-channel
flowmeter, pressing the [
key and the [F3] key accesses
the
GLOBL menu. Then press
[F4] to select the
COMM
submenu . )
PROGRAM
status
ACTIV SYSTM PIPE I/O
COMM PROGRAM
[This baud rate applies only to
the RS232 serial port.] Press the
[ until the desired RS232
baud rate appears on the
option bar and press the
appropriate [Fx] function key
to select it.
PROGRAM
Comm port
BAUD RATE
current value appears here
4800 9600 19200

Communications Options User’s Guide 3
Chapter 1. Modbus Communications
1.3 Setting Up MODBUS Communications (cont.)
See Table 1 for a description of the options available at the above prompt.
Note:
If more than one meter is connected to a network, each meter must have a unique Network I.D.
COMM PROGRAM
[The UART bits setting applies
only to the RS232 serial port.]
Press the [ until the desired
RS232 UART bits setting
appears on the option bar and
then press the appropriate
[Fx] function key to select it.
BAUD RATE
current value appears here
UART bits
current setting appears here
8,no 8,odd 8even 7,no
Table 1: UART Bits Options
Option Bar # Data Bits # Stop Bits Parity
8,no 8 0 None
8,odd 8 0 Odd
8even 8 0 Even
7,odd 7 1 Odd
7even 7 1 Even
COMM PROGRAM [The Network ID number is
used by the IDM software only.]
Enter a Network ID number
between 1 and 254 and then
press [ENT]. The default ID
number is 1.
UART bits
current setting appears here
Network I.D.?
current number appears here
COMM PROGRAM Press the appropriate [Fx]
function key to select [2400],
[4800], or [9600] for the
MODBUS baud rate.
Network I.D.?
current number appears here
MODBUS BAUD RATE
current value appears here
2400 4800 9600

Chapter 1. Modbus Communications
4 Communications Options User’s Guide
Press [EXIT] until you return to RUN mode and the screen resumes the display of data measurements. Then reboot
the meter to load the new settings into memory.
1.4 MODBUS Register Map
To request specific parameters from the flowmeter using MODBUS, the control system must enter the appropriate
register number. Only registers 1 through 90 are available for MODBUS communications, while registers 508 through
512 are used by the flowmeter to store the MODBUS parameters. For details, see:
Table 2 on page 5 for a 1-Channel gas flowmeter (GC868, GF868, GM868, GN868, GS868, XGM868, XGS868)
Table 3 on page 6 for a 2-Channel gas flowmeter (GC868, GF868, GM868, GN868, GS868, XGM868, XGS868)
Table 4 on page 9 for a 1-Channel liquid flowmeter (DF868, XMT868i)
Table 5 on page 11 for a 2-Channel liquid flowmeter (DF868, XMT868i)
Table 6 on page 14 for a Sentinel flowmeter.
Refer to Notes on page 8, page 13, or page 16 for information about the numerical references.
Note:
Depending on the type of flowmeter being programmed, some MODBUS register numbers may have zero
readings. If this is the case, those register types are not available for that flowmeter.
Note: If you request Ch2 or AVE data from a 1-Channel meter, the values will all be zero.
COMM PROGRAM Press the appropriate [Fx]
function key to select [NONE],
[ODD], or [EVEN] for the
MODBUS parity setting.
MODBUS BAUD RATE
current value appears here
MODBUS PARITY
current setting appears here
none odd even
COMM PROGRAM Press the appropriate [Fx]
function key to select [1] or [2]
for the MODBUS stop bits
setting.
MODBUS PARITY
current setting appears here
MODBUS STOP BITS
current setting appears here
1 2
COMM PROGRAM Enter a MODBUS Address
number between 1 and 247.
Then, press [ENT].
MODBUS STOP BITS
current setting appears here
MODBUS Address?
current address appears here

Communications Options User’s Guide 5
Chapter 1. Modbus Communications
Table 2: MODBUS Registers for a 1-Channel Gas Flowmeter
MODBUS Reg # Description Scaling
(decimal places) Size in Bytes
11”Clear Ch1 Totalizers” -- 2 (16 bit signed int)
2 Not Used -- 2 (16 bit signed int)
3, 4** Velocity 2 4 (32 bit Long Integer)
5, 6* 2Act Volumetric -- 4 (IEEE 32 bit Float)
7, 8* 2Std Volumetric -- 4 (IEEE 32 bit Float)
9, 10** 3Fwd Totals Register 13 4 (32 bit Long Integer)
11, 12** 3Rev Totals Register 13 4 (32 bit Long Integer)
13 #Tot Digits 0 2
14, 15* 2Mass Flow -- 4 (IEEE 32 bit Float)
16, 17** 4Fwd Mass Totals Register 20 4 (32 bit Long Integer)
18, 19** 4Rev Mass Totals Register 20 4 (32 bit Long Integer)
20 #MT DIGITS (Mass Tot Digits) 0 2
21, 22** Timer 2 4 (32 bit Long Integer)
23 9Error Code 0 2
24, 25** Sound Speed 3 4 (32 bit Long Integer)
26, 27** 10Density 4 4 (32 bit Long Integer)
28, 29** Signal Strength Upstream 1 4 (32 bit Long Integer)
30, 31** Signal Strength Downstream 1 4 (32 bit Long Integer)
32, 33** Temperature 2 4 (32 bit Long Integer)
34, 35** Pressure 3 4 (32 bit Long Integer)
92, 93 (36, 37)* Signal Quality Up -- 4 (IEEE 32 bit Float)
94, 95 (38, 39)* Signal Quality Down -- 4 (IEEE 32 bit Float)
96, 97 (40, 41)* Amp Discriminator Up -- 4 (IEEE 32 bit Float)
98, 99 (42, 43)* Amp Discriminator Down -- 4 (IEEE 32 bit Float)
100, 101 (44, 45)* SNR Up -- 4 (IEEE 32 bit Float)
102, 103 (46, 47)* SNR Down -- 4 (IEEE 32 bit Float)
508 6MODBUS baud rate 0 2
509 7MODBUS parity 0 2
510 8MODBUS stop bits 0 2
511 MODBUS meter addr 0 2

Chapter 1. Modbus Communications
6 Communications Options User’s Guide
512 RESERVED --- ---
*The complete floating point value is constructed by combining readings from the first register with
a second register. An eight Hex digits number will represent the IEEE-754 hexadecimal floating point
value. 32-bit Hexadecimal Representation To Decimal Floating-Point conversion can be performed
if needed.
Example: Reg 14 reading is 44d7, Reg 15 reading is 4000, Mass Flow is 44d74000, which corresponds
to 1722.
**The complete Long integer value is constructed by combining readings from the first register with
the second register. Eight Hex digits will represent the Long integer value.
Example: Reg 24 is 0019, Reg 25 is ED30, Hexadecimal Sound Speed is 0019ED30, which is converted
to 1699120 decimal. Taking into account that Sound Speed has 3 decimal places (from the map), it
corresponds to a value of 1699.120.
Table 3: MODBUS Registers for a 2-Channel Gas Flowmeter
MODBUS Reg # Description Scaling
(decimal places) Size in Bytes
11”Clear Ch1 Totalizers”-- 2 (16 bit signed int)
21“Clear Ch2 Totalizers” -- 2 (16 bit signed int)
3, 4** Ch1 Velocity 2 4 (32 bit Long Integer)
5, 6* 2Ch1 Act Volumetric -- 4 (IEEE 32 bit Float)
7, 8* 2Ch1 Std Volumetric -- 4 (IEEE 32 bit Float)
9, 10** 3Ch1 Fwd Totals Register 13 4 (32 bit Long Integer)
11, 12** 3Ch1 Rev Totals Register 13 4 (32 bit Long Integer)
13 Ch1 #Tot Digits 0 2
14, 15* 2Ch1 Mass Flow -- 4 (IEEE 32 bit Float)
16, 17** 4Ch1 Fwd Mass Totals Register 20 4 (32 bit Long Integer)
18, 19** 4Ch1 Rev Mass Totals Register 20 4 (32 bit Long Integer)
20 Ch1 #MT DIGITS (Mass Tot Digits) 0 2
21, 22** Ch1 Timer 2 4 (32 bit Long Integer)
23 9Ch1 Error Code 0 2
24, 25** Ch1 Sound Speed 3 4 (32 bit Long Integer)
26, 27** 10Ch1 Density 4 4 (32 bit Long Integer)
28, 29** Ch1 Sig Strength Upstream 1 4 (32 bit Long Integer)
30, 31** Ch1 Sig Strength Downstream 1 4 (32 bit Long Integer)
32, 33** Ch1 Temperature 2 4 (32 bit Long Integer)
34, 35** Ch1 Pressure 3 4 (32 bit Long Integer)
36, 37** Ch2 Velocity 2 4 (32 bit Long Integer)
Table 2: MODBUS Registers for a 1-Channel Gas Flowmeter
MODBUS Reg # Description Scaling
(decimal places) Size in Bytes

Communications Options User’s Guide 7
Chapter 1. Modbus Communications
38, 39* Ch2 Act Volumetric -- 4 (IEEE 32 bit Float)
40, 41* Ch2 Std Volumetric -- 4 (IEEE 32 bit Float)
42, 43** Ch2 Fwd Totals Register 46 4 (32 bit Long Integer)
44, 45** Ch2 Rev Totals Register 46 4 (32 bit Long Integer)
46 Ch2 #Tot Digits 0 2
47, 48* Ch2 Mass Flow -- 4 (IEEE 32 bit Float)
49, 50** Ch2 Fwd Mass Totals Register 53 4 (32 bit Long Integer)
51, 52** Ch2 Rev Mass Totals Register 53 4 (32 bit Long Integer)
53 Ch2 #Mass Tot Digits 0 2
54, 55** Ch2 Timer 2 4 (32 bit Long Integer)
56 9Ch2 Error Code 0 2
57, 58** Ch2 Sound Speed 3 4 (32 bit Long Integer)
59, 60** 10Ch2 Density 4 4 (32 bit Long Integer)
61, 62** Ch2 Sig Strength Upstream 1 4 (32 bit Long Integer)
63, 64** Ch2 Sig Strength Downstream 1 4 (32 bit Long Integer)
65, 66** Ch2 Temperature 2 4 (32 bit Long Integer)
67, 68** Ch2 Pressure 3 4 (32 bit Long Integer)
69, 70** Avg Velocity 2 4 (32 bit Long Integer)
71, 72* Avg Act Volumetric -- 4 (IEEE 32 bit Float)
73, 74* Avg Std Volumetric -- 4 (IEEE 32 bit Float)
75, 76** Avg Fwd Totals Register 79 4 (32 bit Long Integer)
77, 78** Avg Rev Totals Register 79 4 (32 bit Long Integer)
79 Avg #Tot Digits 0 2
80, 81* Avg Mass Flow -- 4 (IEEE 32 bit Float)
82, 83** Avg Fwd Mass Totals Register 86 4 (32 bit Long Integer)
84, 85** Avg Rev Mass Totals Register 86 4 (32 bit Long Integer)
86 Avg #Mass Tot Digits 0 2
87, 88** Avg Timer 2 4 (32 bit Long Integer)
89 5Avg Error Code 0 2
90, 91** Avg Sound Speed 3 4 (32 bit Long Integer)
92, 93* CH1 Signal Quality Up -- 4 (IEEE 32 bit Float)
94, 95* CH1 Signal Quality Down -- 4 (IEEE 32 bit Float)
96, 97* CH1 Amp Discriminator Up -- 4 (IEEE 32 bit Float)
98, 99* CH1 Amp Discriminator Down -- 4 (IEEE 32 bit Float)
100, 101* CH1 SNR Up -- 4 (IEEE 32 bit Float)
102, 103* CH1 SNR Down -- 4 (IEEE 32 bit Float)
104, 105* CH2 Signal Quality Up -- 4 (IEEE 32 bit Float)
106, 107* CH2 Signal Quality Down -- 4 (IEEE 32 bit Float)
108, 109* CH2 Amp Discriminator Up -- 4 (IEEE 32 bit Float)
110, 111* CH2 Amp Discriminator Down -- 4 (IEEE 32 bit Float)
Table 3: MODBUS Registers for a 2-Channel Gas Flowmeter
MODBUS Reg # Description Scaling
(decimal places) Size in Bytes

Chapter 1. Modbus Communications
8 Communications Options User’s Guide
1.4.1 Notes for a Gas Flowmeter:
1. Clear Totalizers:
Write 1 to Reg 1 to clear Channel 1 totalizers.
Write 1 to Reg 2 to clear Channel 2 totalizers.
2. Values in these registers are floating point numbers and require no scaling. The number of decimal digits is set in
meter programming.
3. Require scaling by value in register 13.
4. Require scaling by value in register 20.
5. AVG Error Code:
0=Both Ch1 and Ch2 are in error.
1=Ch1 only is in error
2=Ch2 only is in error
3=Both channels are error free
6. MODBUS baud rate:
5 = 2400, 6 = 4800, 7 = 9600
7. MODBUS parity:
0 = none, 1 = odd, 2 = even
8. MODBUS stop bits:
1 = 1 stop bit, 2 = 2 stop bits
9. Error Code:
Highest single number, or combination of error numbers, listed without an “E”. Error codes should be explained in
the user’s manual or guide.
IMPORTANT: If the unit is reading over range, an error condition will occur and output 20mA (for a 0-20mA range) or
21.10mA (for a 4-20mA range).
112, 113* CH2 SNR Up -- 4 (IEEE 32 bit Float)
114, 115* CH2 SNR Down -- 4 (IEEE 32 bit Float)
508 6MODBUS baud rate 0 2
509 7MODBUS parity 0 2
510 8MODBUS stop bits 0 2
511 MODBUS meter addr 0 2
512 RESERVED --- ---
*The complete floating point value is constructed by combining readings from the first register with
a second register. An eight Hex digits number will represent the IEEE-754 hexadecimal floating point
value. 32-bit Hexadecimal Representation To Decimal Floating-Point conversion can be performed
if needed.
Example: Reg 14 reading is 44d7, Reg 15 reading is 4000, Mass Flow is 44d74000, which corresponds
to 1722.
**The complete Long integer value is constructed by combining readings from the first register with
the second register. Eight Hex digits will represent the Long integer value.
Example: Reg 24 is 0019, Reg 25 is ED30, Hexadecimal Sound Speed is 0019ED30, which is converted
to 1699120 decimal. Taking into account that Sound Speed has 3 decimal places (from the map), it
corresponds to a value of 1699.120.
Table 3: MODBUS Registers for a 2-Channel Gas Flowmeter
MODBUS Reg # Description Scaling
(decimal places) Size in Bytes

Communications Options User’s Guide 9
Chapter 1. Modbus Communications
10. Descriptions:
For the GF868, register numbers 26, 27 and 59, 60 have the description Molecular Weight.
For the GN868, register numbers 26, 27 and 59, 60 have the description Fpv.
Table 4: MODBUS Registers for a 1-Channel Liquid Flowmeter
MODBUS Reg # Description Scaling
(decimal places) Size in Bytes
11Clear Totalizers 2 (16 bit signed int)
2, 3** Velocity 2 4 (32 bit Long Integer)
4, 5* Volumetric -- 4 (IEEE 32 bit Float)
6, 7** +Totals Register 10 4 (32 bit Long Integer)
8, 9** –Totals Register 10 4 (32 bit Long Integer)
10 #T Digits 0 2 (16 bit signed int)
11, 12** Totalizer Time 2 4 (32 bit Long Integer)
13 2Error Value 0 2 (16 bit signed int)
14, 15** SSUP 1 4 (32 bit Long Integer)
16, 17** SSDN 1 4 (32 bit Long Integer)
18, 19** SNDSP 0 4 (32 bit Long Integer)
56, 57* Power -- 4 (IEEE 32 bit Float)
58, 59** +Energy Register 62 4 (32 bit Long Integer)
60, 61** –Energy Register 62 4 (32 bit Long Integer)
62 # Energy Digits 0 2 (16 bit signed int)
63, 64** TempS 2 4 (32 bit Long Integer)
65, 66** TempR 2 4 (32 bit Long Integer)
67, 68** TS-TR 2 4 (32 bit Long Integer)
69, 70** DELTH 2 4 (32 bit Long Integer)
86, 87* 5Slot 1 Input A 4 (IEEE 32 bit Float)
88, 89* 5Slot 1 Input B 4 (IEEE 32 bit Float)
90, 91* Slot 2 Input A 4 (IEEE 32 bit Float)
92, 93* Slot 2 Input B 4 (IEEE 32 bit Float)
94, 95* Slot 3 Input A 4 (IEEE 32 bit Float)
96, 97* Slot 3 Input B 4 (IEEE 32 bit Float)
98, 99* Slot 4 Input A 4 (IEEE 32 bit Float)
100, 101* Slot 4 Input B 4 (IEEE 32 bit Float)
102, 103* Slot 5 Input A 4 (IEEE 32 bit Float)
104, 105* Slot 5 Input B 4 (IEEE 32 bit Float)
106, 107* Slot 6 Input A 4 (IEEE 32 bit Float)
108, 109* Slot 6 Input B 4 (IEEE 32 bit Float)
508 6MODBUS baud rate 0 2 (16 bit signed int)
509 7MODBUS parity 0 2 (16 bit signed int)
510 8MODBUS stop bits 0 2 (16 bit signed int)
511 MODBUS meter address 0 2 (16 bit signed int)

Chapter 1. Modbus Communications
10 Communications Options User’s Guide
512 RESERVED -- --
*The complete floating point value is constructed by combining readings from the first register with
a second register. An eight Hex digits number will represent the IEEE-754 hexadecimal floating point
value. 32-bit Hexadecimal Representation To Decimal Floating-Point conversion can be performed
if needed.
Example: Reg 4 reading is 44d7, Reg 5 reading is 4000, Volumetric is 44d74000, which corresponds
to 1722.
**The complete Long integer value is constructed by combining readings from the first register with
the second register. Eight Hex digits will represent the Long integer value.
Example: Reg 2 is 0019, Reg 3 is ED30, Hexadecimal Velocity is 0019ED30, which corresponds to
1699120 decimal. Taking into account that Velocity has 2 decimal places (from the map), it
corresponds to a value of 16991.20.
Table 4: MODBUS Registers for a 1-Channel Liquid Flowmeter
MODBUS Reg # Description Scaling
(decimal places) Size in Bytes