FMC Technologies MPU B Series, MPU 1200 V6 Procedures Manual

Multipath Ultrasonic Gas Flow Meter

External Data Communication,

MPU Series B

Procedure Manual

PRD-0000022543 / Rev. 00D / FL / nb / Apr il 2008 MNKS008 0.0 (4/08)

The Most Trusted Name In Measurement

External Data Communication

External Data Communication, MPU Series B

Procedure

History

Revision Date Editor ECN Status Description

Rev. 03 / C 01.03.2007 xxx

Rev. 00D April 2008 NB

50000058026

20207

released
released

Take over from KOS SAP System
New Logo

Important

All information and technical specifications in this documentation have been carefully checked
and compiled by the author. However, we cannot completely exclude the possibility of errors.
Smith Meter GmbH is always grateful to be informed of any errors.

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TABLE OF CONTENT

1. INTRODUCTION............................................ ...........................................5

1.1. GENERAL..............................................................................................5

1.2. References ............................................................................................5

1.3. Abbreviations........................................................................................5

1.4. Definitions.......................................... ...................................................5

2. PROTOCOL DETAILS .............................................................................7

2.1. ModBus On Serial Port ........................................................................7

2.1.1. Serial Port 1...................................... ...........................................7

2.1.2. Serial Port 2...................................... ...........................................7

2.1.3. Hardware interface details...........................................................8

2.1.4. Timing considerations for RS-485...............................................8

2.2. ModBus On TCP/IP................................................ ...............................8

3. REGISTER MAPPINGS........................................................................ ....9

3.1. Input Registers .....................................................................................9

3.2. Results/Output Registers ..................................................................10

3.3. High Resolution Accumulators.........................................................11

3.4. Parameter Registers...........................................................................12

3.4.1. Spoolpiece Geometry................................................................12

3.4.2. Rate Calibration Factors....................................... ... .... ........ .... ..12

4. REGISTER USAGE........................................... .... .... ....... .... .... ........ .... ..13

4.1. The MPU Series B Alarm Status .......................................................13

4.2. The ModBus Protocol – Message Exchange Example...................14

4.2.1. Modbus Read Message Example ........................... ..................14

4.2.2. ModBus Write Message Example .............................................15

5. REGISTER MAPPINGS FOR THE DECA CALCULATIONS................17

5.1.

External Input Values................ .........................................................17

5.2. Mode Parameters................................................................................17

5.3. Input Parameters ................................................................................18

5.4. Calculation Results.......................................................... ..................19

6. WINDOWS COMMUNICATION SOFTWARE...................................... ..21

6.1. MPUCOMM Dynamic Link Library ....................................................21

6.1.1. Installation..................................................................................21

6.1.2. Running The Test Programs.....................................................22

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6.1.3. The Network Programmers Interface........................................23

6.1.4. Status Return Codes ................................................... ..............27

6.2. MPU Series B WinScreen ..................................................................27

Figures

Figure 1 - Flow Computer Application Example ........................................................... 13

Figure 2 - ModBus Read Message Example................................................................... 14

Figure 3 - ModBus Read Reply Message Example........................................................14

Figure 4 - ModBus Write Message Example.................................................................. 15

Figure 5 - ModBus Write Reply Message Example....................................................... 15

Figure 6 - DLLTester User Interface .............................................................................. 22

Figure 7 - Running the SimpleTalk.exe application....................................................... 23

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1. INTRODUCTION

1.1. GENERAL

This document contains a description of how to use the MPU
Series B ModBus interfaces. Both the serial interface and the
Ethernet interface is described.

1.2. References

Doc. No

1 USM-0000020565 MPU Series B User Manual: Operators

2 Andy Swales, Schneider Electric: Open

Title

Manual – Configuring the ModBus Serial
Ports.

ModBus/TCP Specification, Release 1.0 29

March 1999

1.3. Abbreviations

CP

DSP

cpBus Communications Processor Bus. Dedicated protocol used

Communications Processor

Digital Signal Processor

for transmitting messages between the internal modules of
the CP

1.4. Definitions

IP Internet Protocol
MPU MultiPath Ultrasonic
TCP Transport Control Protocol

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2. PROTOCOL DETAILS

The MPU Series B ModBus protocol will only operate in RTU
mode.

All floating point values are represented as 32-bit real numbers in
two consecutive 16-bit ModBus registers.

All integer values are represented as 32-bit integers in two
consecutive 16-bit ModBus registers.

The MPU Series B acts as a ModBus Slave.

2.1. ModBus On Serial Port

The MPU Series B supports ModBus connections on one or both
of its serial ports.

2.1.1. Serial Port 1

The settings for this port are shown in the table below.

Baud rate 9600
Parity None
Data bits 8
Stop bits 1
ModBus node
number

2.1.2. Serial Port 2

The following settings are fixed for port 2:

Parity None
Data bits 8
Stop bits 1

1

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2.1.3. Hardware interface details

The actual hardware interface used can be one of the following:

RS-232 (Full Duplex)
2-wire RS-485 (Half Duplex)
4-wire RS-485, i.e. RS-422 (Full Duplex)

2.1.4. Timing considerations for RS-485

For the Half Duplex RS-485 (2-wire) interface, the following
timing considerations must be taken into account by the software
on the ModBus master:

There must be at least a 20 mS "silent interval" from receiving a
ModBus reply from the MPU, before the next ModBus request
message issued by the master to the MPU. The software on the
ModBus master will typically need to follow this pattern of
communication:

Send a request message A to the MPU
Read the reply message from the MPU

Wait for at least 20 mS

Send the next request message B to the MPU

...etc...

This will ensure that the MPU has sufficient amount of time to
change the driver direction before the master sends the next
request.

2.2. ModBus On TCP/IP

The MPU Series B ModBus on TCP/IP implementation conforms
to the definition in section 1.2 References [2].

The following requirements apply to the ModBus Application
Protocol (MBAP) header used for TCP/IP:

Fields Length Client
Transaction Identifier 2 bytes Must be 0
Protocol Identifier 2 bytes Must be 0
Length 2 bytes Minimum 6
Unit Identifier 1 byte Must be 1

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3. REGISTER MAPPINGS

This section lists the specific MPU Series B database object numbers
and ModBus addresses.

3.1. Input Registers

The following registers should be updated continuously by the
external system to ensure proper functioning of the MPU Series B.

Object

number

10000

10001

1002 2004 Gas Density at Line Conditions, external

1003 2006 Gas Density at Ref Conditions, external

1004 2008 Gas Compressibility at Line Cond.,

1005 2010 Gas Compressibility at Ref Cond.,

ModBus

Address

20000 Line Pressure, external source

20002 Line Temperature, external source C

NOTE: All values are 32-bit float values.

NOTE: The system may be configured to deliver values in

U.S. units instead of S.I. metric.

Description Unit

source

source

external source

external source

barA

Kg/m3

Kg/Sm3

-

-

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3.2. Results/Output Registers

The following registers are the results registers of the MPU Series B.
They are all 32-bit float values. They are updated on the completion of
every measurement cycle.

Object

number

0 0 Log count
1 2 Alarm Status
2 4 Flow Velocity m/s
3 6 Velocity of Sound m/s
4 8 Actual Volum Flowrate m3/h
5 10 Accumulated Volume Forward m3
6 12 Accumulated Volume Reverse m3
7 14 Accumulated error volume foward m3
8 16 Accumulated error volume reverse m3

9 18 Accumulated time
10 20 Volume Increment
11 22 Increment Time Duration *5 sec
12 24 Used Line Pressure barA
13 26 Used Line Temperature Celsius
14 28 Measured Flow Velocity path 1 m/s
15 30 Measured Flow Velocity path 2 m/s
16 32 Measured Flow Velocity path 3 m/s
17 34 Measured Flow Velocity path 4 m/s
18 36 Measured Flow Velocity path 5 m/s
19 38 Measured Flow Velocity path 6 m/s
20 40 Measured Velocity of Sound path 1 m/s
21 42 Measured Velocity of Sound path 2 m/s
22 44 Measured Velocity of Sound path 3 m/s
23 46 Measured Velocity of Sound path 4 m/s
24 48 Measured Velocity of Sound path 5 m/s
25 50 Measured Velocity of Sound path 6 m/s
26 52 Percentage Of Signals Used Transducer 1A %
27 54 Percentage Of Bursts Used Transducer 2A %
28 56 Percentage Of Bursts Used Transducer 3A %
29 58 Percentage Of Bursts Used Transducer 4A %
30 60 Percentage Of Bursts Used Transducer 5A %
31 62 Percentage Of Bursts Used Transducer 6A %
32 64 Percentage Of Bursts Used Transducer 6B %
33 66 Percentage Of Bursts Used Transducer 5B %
34 68 Percentage Of Bursts Used Transducer 4B %
35 70 Percentage Of Bursts Used Transducer 3B %
36 72 Percentage Of Bursts Used Transducer 2B %

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ModBus
Address

Description Unit

*1

-

*2

-

*3

sec

*4

m

3

MPU Series B

Ultrasonic Gas Flow Meter

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Object

number

ModBus
Address

Description Unit

37 74 Percentage Of Bursts Used Transducer 1B %
38 76 Gain Transducer 1A ­39 78 Gain Transducer 2A ­40 80 Gain Transducer 3A ­41 82 Gain Transducer 4A ­42 84 Gain Transducer 5A ­43 86 Gain Transducer 6A ­44 88 Gain Transducer 6B ­45 90 Gain Transducer 5B ­46 92 Gain Transducer 4B ­47 94 Gain Transducer 3B ­48 96 Gain Transducer 2B ­49 98 Gain Transducer 1B -

*1

This is a counter that is incremented by one on the completion of every

measurement cycle.

*2

This is the MPU Series B alarm status word. A non-zero value here indicates
that one or more alarms have been raised on the MPU Series B. See chapter 4.1
for details.

*3

This is the elapsed time in seconds since the MPU Series B was powered-up

*4

This is the volume measured during the most recent measurement cycle.

*5

This is the time elapsed during the most recent measure m ent cycle

3.3. High Resolution Accumulators

In some cases the normal 32-bit floating point presentation of the
accumulated flow may not give enough resolution. The following
objects offer a high resolution view of the accumulator registers.

Object

number

230 460 Accumulated Volume Forward m3 m3
231 462 Accumulated Volume Forward m3 * 1e-9 m3
232 464 Accumulated Volume Reverse m3 m3
233 466 Accumulated Volume Reverse m3 * 1e-9 m3
234 468 Accumulated error volume forward m3 m3
235 470 Accumulated error volume forward m3 * 1e-9 m3
236 472 Accumulated error volume reverse m3 m3
237 474 Accumulated error volume reverse m3 * 1e-9 m3

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3.4. Parameter Registers

The following registers are the parameter registers of the MPU Series
B. They are all 32-bit float values.

3.4.1. Spoolpiece Geometry

The table below identifies the parameters defining the spoolpiece
geometry.

Object

number

400 800 Internal Pipe Diameter mm
401 802 Transducer Path 1 Length mm
402 804 Transducer Path 2 Length mm
403 806 Transducer Path 3 Length mm
404 808 Transducer Path 4 Length mm
405 810 Transducer Path 5 Length mm
406 812 Transducer Path 6 Length mm
407 814 Transducer Path 1 Angle deg
408 816 Transducer Path 2 Angle deg
409 818 Transducer Path 3 Angle deg
410 820 Transducer Path 4 Angle deg
411 822 Transducer Path 5 Angle deg
412 824 Transducer Path 6 Angle deg
413 826 Wall thickness spool piece mm
414 828 Measurement Ref. Temperature Celsius

3.4.2. Rate Calibratio n F ac tors

The table below identifies the calibration factors used by the MPU
Series B.

Object

number

416 832 Rate Correction factor A (Pos Dir)
417 834 Rate Correction factor B (Pos Dir) m3/h
418 836 Rate Correction factor A (Neg Dir)
419 838 Rate Correction factor B (Neg Dir) m3/h

(1) Rate correction is accomplished by applying the formula:

There are separate factors for the two flow directions.

ModBus
Address

ModBus
Address

BFlowRateA+⋅ .

Description Unit

Description Unit

See (1)

-

-

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4. REGISTER USAGE

Figure 1 below describes the most common way to implement a
master application that is synchronised with the MPU Series B.

In this example, the master application running on an external flow
computer is responsible for writing the correct pressure and
temperature to the MPU Series B.

Start

Read object 0

Object 0

changed?

YES

Read objects of
interest from the

database

Store values

in flow computer

memory

Write pressure &

temperature to
objects 10000

and 10001

NO

Figure 1 - Flow Computer Application Example

4.1. The MPU Series B Alarm Status

The MPU Series B Alarm Status is a bit coded value indicating the
state of the MPU Series B alarms. To correctly interpret the bits, the
32-bit float value has to be converted into a 32-bit integer value. The
table below shows the alarm bits used and their interpretation.

Bit Value Alarm interpretation

0 1 High Flow Alarm
1 2 Hardware Error
2 4 Transducer Failure
3 8 Calculation Failure
4 16 Burst Percent Low
5 32 Gain Error
6 64 Velocity-of-sound difference too large
7 128 Flow corrections active

Wait 3 seconds

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4.2. The ModBus Protocol – Message Exchange
Example

This chapter describes the exchange of messages taking place in a
typical Flow Computer - MPU communication.

4.2.1. Modbus Read Message Example

In the following example the flow computer performs the following
task:

- Read temperature and pressure from the MPU Series B

The database objects used for pressure and temperature from an
external source are object numbers 10000 and 10001. These have the
ModBus addresses 20000 and 20002. These registers are read with
ONE message with function code 3. Figure 2 below shows the
contents of this message.

Node

no.

Function

code

1st register

address

Number of
16-bit values

01 03 4E 20 00 04

Figure 2 - ModBus Read Message Example

Note: All bytes are shown in hexadecimal format.

The reply from the MPU Series B will be on the format described in
Figure 3 below.

Node

Function

no.

code

count

01 03 08 42 C8 00

Pres sure - 100 ba rAByte

Temp - 37.5 barA

00 42 16 00

00

Figure 3 - ModBus Read Reply Message Examp le

The message contains the content of database objects 10000 (pressure)
and 10001 (temperature) represented as two 32-bit real values (least
significant byte first).

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4.2.2. ModBus Write Message Example

In this example the flow computer performs the following task:

- Write temperature and pressure from the MPU Series B

The database objects used for pressure and temperature from an
external source are object numbers 10000 and 10001. These have the
ModBus addresses 20000 and 20002. These registers are written with
ONE message with function code 16. Figure 4 below shows the
contents of this message.

Node

no.

Function

code

address

Number of

16-bit values

Byte

Count

Pressure - 100 barA1st register

Temp - 37.5 barA

01 10 4E 20 00 04

08 42 C8 00

00

42 16 00 00

Figure 4 - ModBus Write Message Example

The reply from the MPU Series B will be on the format described in
the figure below.

Node

Function

no.

code

01 10 4E 20 00 04

1st register

address

Number of

16-bit values written

Figure 5 - ModBus Write Reply Message Example

The message contains a copy of the first 6 bytes of the request
message.

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5. REGISTER MAPPINGS FOR THE DECA
CALCULATIONS

The DECA algorithms running on the MPU uses a separate set of
ModBus registers. These are described in this chapter.

5.1. External Input Values

The table below identifies external input values required by the
DECA algorithms.

Object

number

10000 20000 Line Pressure
10001 20002 Line Temperature C
10002 20004 Gas Density at Line Conditions, external

ModBus
Address

Description Unit

barA

kg/m3

source

5.2. Mode Parameters

Object

number

710 1420 DECA Algorithm Selection:

This is a 32-bit integer value.

ModBus
Address

Description Unit

-

0. No DECA calculations performed

1.DECA A

2.DECA B

3. DECA C

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5.3. Input Parameters

The table below identifies parameters required as input by the
DECA algorithms.

Object

number

570 1140 Calculated composition : Minimum avg.

571 1142 Calculated composition : Maximum avg.

572 1144 Mole Methane (C1) % mol
573 1146 Mole Nitrogen (N2) % mol
574 1148 Mole Carbon dioxide (CO2) % mol
575 1150 Mole Ethane (C2) % mol
576 1152 Mole Propane (C3) % mol
577 1154 Mole Water (H2O) % mol
578 1156 Mole Hydrogen sulphide (H2S) % mol
579 1158 Mole Hydrogen (H2) % mol
580 1160 Mole Carbon oxide (CO) % mol
581 1162 Mole Oxygen (O2) % mol
582 1164 Mole i-Butane (IC4) % mol
583 1166 Mole n-Butane (NC4) % mol
584 1168 Mole i-Pentane (IC5) % mol
585 1170 Mole n-Pentane (NC5) % mol
586 1172 Mole n-Hexane (NC6) % mol
587 1174 Mole n-Heptane (NC7) % mol
588 1176 Mole c-Octane (NC8) % mol
589 1178 Mole n-Nonane (NC9) % mol
590 1180 Mole n-Decane (NC10) % mol
591 1182 Mole Helium (HE) % mol
592 1184 Mole Argon (AR) % mol
593 1186 Mole Hexane+ (C6+) % mol
594 1188 Mole rest % mol
595 1190 Reference Temperature C
596 1192 Reference Pressure barA

ModBus
Address

Description Unit

mole weight

mole weight

kg/mol

kg/mol

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5.4. Calculation Results

The table below identifies the results of the DECA algorithms.

Object

number

170 340 Calculated Velocity of Sound m/s
171 342 Calculated average Mole Weight kg/mol
172 344 Calculated DZ/DP 1/Pa
173 346 Calculated DZ/DT 1/K
174 348 Calculated Isobaric Heat Capacity J/kmol
175 350 Calculated gas compressibility, line ­176 352 Calculated Gas Density, line kg/m3
177 354 Spare x 3
180 360 Mole Methane (C1) % mol
181 362 Mole Nitrogen (N2) % mol
182 364 Mole Carbon dioxide (CO2) % mol
183 366 Mole Ethane (C2) % mol
184 368 Mole Propane (C3) % mol
185 370 Mole Water (H2O) % mol
186 372 Mole Hydrogen sulphide (H2S) % mol
187 374 Mole Hydrogen (H2) % mol
188 376 Mole Carbon oxide (CO) % mol
189 378 Mole Oxygen (O2) % mol
190 380 Mole i-Butane (IC4) % mol
191 382 Mole n-Butane (NC4) % mol
192 384 Mole i-Pentane (IC5) % mol
193 386 Mole n-Pentane (NC5) % mol
194 388 Mole n-Hexane (NC6) % mol
195 390 Mole n-Heptane (NC7) % mol
196 392 Mole n-Octane (NC8) % mol

ModBus
Address

Description Unit

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6. WINDOWS COMMUNICATION SOFTWARE

6.1. MPUCOMM Dynamic Link Library

This communication link provides a fast and simple way of
communicating with the MPU Series B using the network
interface. The interface is based on a Microsoft Windows DLL.
This DLL encapsulate all the communication with the MPU Series
B, and offers a set of library functions that can be called from your
program. (DLLs are callable from most programming languages
including Microsoft visual C++, Microsoft Visual Basic, National
Instrument Lab View/Lab Windows, Office applications that can
be programmed with Visual Basic Macros i.e. Excel).

The PC to use this DLL has to have the following “pieces”:

1. Running Microsoft Windows 98/NT//2000 or later versions.

2. Ethernet network (or a Ethernet card in your computer)

3. TCP/IP protocol installed under Windows.

4. Application can then call a Windows DLL (Dynamic Link

Library). The DLL contains simple functions to read or write to
the MPU Series B database via the network.

6.1.1. Installation

The IP address of the MPU Series B must be defined in the host
file. For example:

128.1.221.121 MPUsn11

where ‘128.1.221.121’ is the IP address, and ‘MPUsn11’ is the
name the machine can be referenced by.

This file is usually found in directory
C:\WINNT\system32\drivers\etc\ on PCs running Windows NT,
and under C:\WINDOWS\…. on PCs running Windows 98.

The following files is included in the MPU Series B network
communication toolkit:

1. MPUBComm.dll - Callable library containing the

implementation of the communication system.

2. MPUBComm.lib - Linkable library for Microsoft visual C++.

3. DLLTester.exe – An executable test program with a simple user

interface

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4. SimpleTalk.cpp – A very simple working example program in

C showing the use of the DLL.

5. MPUBCommExample.exe - Executable of the above.

6. W95ws2setup.exe – Installation of windows socket version 2

for Windows 95.

Note: The library uses windows socket version 2. This

component is standard in Windows NT 4.0, and
Windows 98. Some versions of Windows 95 haven’t got
this component installed. If problems in Windows 95,
run the “W95ws2setup.exe” program. This installs
windows sockets version 2.

Warning: Do not run “W95ws2setup.exe” if you have Windows

NT 4.0, Windows 98 or later.

6.1.2. Running The Test Programs

Both test programs must be run from the same directory the
MPUBComm.dll file is located.

DLLTester.exe

This test program displays a simple dialog where the user can read
and write values to the MPU Series B database. This is shown in
Figure 6 below.

Figure 6 - DLLTester User Interface

SimpleTalk.exe

This is a simple console application that reads 5 values from the
MPU Series B database. It always reads the same 5 objects starting
from database object number 0.

Open a DOS window and enter the command:

SimpleTalk <machine name>

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Figure 7 shows a sample run of this application.

Figure 7 - Running the SimpleTalk.exe application

6.1.3. The Network Programmers Interface

The following functions are implemented in the DLL:

GetFloatValues

This functions reads object as float values from the MPU Series B
database.

int DLLAPI getFloatValues(
// Input
const char *lpszHost, //
Hostname to connect to (MPUsn11)
unsigned short nFirstObjectNumber, //
First database object to read
unsigned short nNOfObject, // The
number of objects to read
// Output
float *pfValueBuffer //
Buffer to store the values

);

Parameters :

 LpszHost

Specifies the host to connect. The host must be defined in the
host file on your PC. The string must be null terminated.

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 NFirstObjectNumber

Specifies the object number of the first database value to read.
These object numbers are defined in section 3.

 NNOfObject

Specifies how many objects to read. This must be a number
between 1 and 64. The parameter must be a 16 bit integer.

 PfValueBuffer

Specifies the memory address where the function will place the
read values. The parameter must be a pointer to an array of 32
bits single precision floating point values. The size of the array
must at least be nFirstObjectNumber * 4 bytes.

GetIntValues

This functions reads object as float values from the MPU Series B
database.

int DLLAPI getFloatValues(
// Input
const char *lpszHost, //
Hostname to connect to (MPUsn11)
unsigned short nFirstObjectNumber, //
First database object to read
unsigned short nNOfObject, // The
number of objects to read
// Output
int *pnValueBuffer //
Buffer to store the values
);

Parameters :

 LpszHost

Specifies the host to connect. The host must be defined in the
host file on your PC. The string must be null terminated.

 NFirstObjectNumber

Specifies the object number of the first database value to read.
These object numbers are defined in section 3.

 NNOfObject

Specifies how many objects to read. This must be a number
between 1 and 64. The parameter must be a 16 bit integer.

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 PnValueBuffer

Specifies the memory address where the function will place the
read values. The parameter must be a pointer to an array of 64
bits integer values. The size of the array must at least be
nFirstObjectNumber * 8 bytes.

SetFloatValues:

This function writes floating point values to the MPU Series B
database.

int DLLAPI setFloatValues(
// Input
const char *lpszHost, //
Hostname to connect to (MPUsn11)
unsigned short nFirstObjectNumber, //
First database object to read
unsigned short nNOfObject, // The
number of objects to read
float *pfValueBuffer //
Buffer with the values

);

Parameters :

 LpszHost

Specifies the host to connect. The host must be defined in the
host file on your PC. The string must be null terminated.

 NFirstObjectNumber

Specifies the object number of the first database value to write.
These object numbers are defined in section 3.

 NNOfObject

Specifies how many objects to write. This must be a number
between 1 and 64. The parameter must be a 16 bit integer.

 PfValueBuffer

Specifies the memory address where the values to write are
fetched from. The parameter must be a pointer to an array of 32
bits single precision values. The size of the array must at least
be nFirstObjectNumber * 4 bytes.

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setIntValues

This function writes integer values to the MPU Series B database.

int DLLAPI setIntValues(
// Input
const char *lpszHost, //
Hostname to connect to (MPUsn11)
unsigned short nFirstObjectNumber, //
First database object to read
unsigned short nNOfObject, //
The number of objects to read
int *pnValueBuffer //
Buffer with the values

);

Parameters :

 LpszHost

Specifies the host to connect. The host must be defined in the
host file on your PC. The string must be null terminated.

 NFirstObjectNumber

Specifies the object number of the first database value to write.
These object numbers are defined in section 3.

 NNOfObject

Specifies how many objects to write. This must be a number
between 1 and 64. The parameter must be a 16 bit integer.

 PnValueBuffer

Specifies the memory address where the values to write are
fetched from. The parameter must be a pointer to an array of 64
bits integer values. The size of the array must at least be
nFirstObjectNumber * 8 bytes.

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MPU Series B

Ultrasonic Gas Flow Meter

______________________________________________________________________

6.1.4. Status Return Codes

The functions implemented in DLL return a single status code upon
return. The code is returned as a 64-bit integer.

The table below shows the valid return values.

Return
Code

0 The function call succeeded
1 The function call failed
2 The connection attempt to the MPU Series B failed
3 The specified database address was invalid

Description

6.2. MPU Series B WinScreen

The MPU Series B WinScreen is a stand-alone application for
communicating with the MPU Series B. It can be used with both
the TCP/IP and the serial ModBus interface. Refer to
PRD-0000020565 “User Manual, MPU Series B” for more details.

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The specifications contained herein are subject to change without notice and any user of said specificati ons should verify from th e m anuf a ctu r er t hat th e
specifications are currently in effect. Otherwise, the manufacturer assumes no responsibility for the use of specifications which may have been change d
and are no longer in effect.

Headquarters:

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Gas Measurement Products:
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Integrated Measurement Systems:
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Kongsberg, Norway
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____________________________________________________________________
Page 28 of 28 PRD-0000022543 Rev .00D

Visit our website at www.fmctechnologies.com/measurementsolutions

Printed in U.S.A. © 4/08 FMC Technologies Measurement Solutions, Inc. All rights reserved. ICP-0000022543 .00D/MNKS008 Issue/Rev. 0.0 (4/08)

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