Teledyne ADFM Pro20 User manual

ADFM
Acoustic Doppler Flow Meter
TECHNICAL MANUAL
This manual includes information for the following products:
ADFM Pro20
ADFM Analog Output Module
ADFM Hot Tap
Teledyne Isco P/N 69-7103-001
January 2000

ADFM Velocity Profiler
Technical Manual
January 2000
NOTE. This manual applies to ADFM firmware version 6.37 or higher. When newer firmware
versions are released, some commands may be modified or added. Read the README file on
the upgrade disk or check MGD’s web site for the latest changes.
IMPORTANT NOTICE
MGD Technologies Inc. was acquired as a subsidiary of Teledyne Isco Inc. in December, 2005 and was
merged into Teledyne Isco in May, 2006. New contact information is printed below:
Teledyne Isco Inc.
4700 Superior Street
Lincoln, Nebraska, 68504
[phone] [phone]
FAX [phone]
E-mail (Customer Service): [email protected]
E-mail (Technical Service): [email protected]
Web site: www.isco.com
Copyright © 2000 by MGD Technologies Inc., Copyright © 2006 by Teledyne Isco Inc. - All rights reserved.
Teledyne Isco P/N 69-7103-001 (January 2000)

Table of Contents
LIST OF EFFECTIVE PAGES
Edition 4 – January 14, 2000 – Firmware version 6.37
New editions are complete revisions of the manual. Update packages, which are issued
between editions, contain additional and replacement pages to be merged into the manual by
the customer. The dates on the title page change only when a new and revised edition is
published.
A software and/or firmware version code may be printed before the issue data; this indicates
the revision level of the software and/or firmware of this instrument at the time of the manual
or update was issued. Many product updates and fixes do not require manual changes and,
conversely, manual corrections may be done without accompanying product changes.
Therefore, do not expect a one to one correspondence between product updates and manual
updates.
The total number of pages in this manual is 148.
Section # of Pages
Table of Contents 10
Chapter 1 6
Chapter 2 10
Chapter 3 6
Chapter 4 8
Chapter 5 10
Chapter 6 10
Appendix-A 10
Appendix-B 6
Appendix-C
Appendix-D
Appendix-E
52
6
14
Total page count 148
ii MGD Technologies Inc.

Table of Contents
RECORD OF CHANGES
Edition Effective Description
3 February 96 Firmware version 6.17 through 6.30
4 January 00 Firmware version 6.37
ADFM Technical Manual (January 2000) iii

Table of Contents
NOTES
iv MGD Technologies Inc.

Table of Contents
Table of Contents
Introduction to the ADFM Velocity Profiler™.......................................1-1
1-1 Overview ..................................................................................................................1-1
1-2 Getting Started.........................................................................................................1-1
1-3 General Operation....................................................................................................1-2
1-3.1 General Warnings and Cautions .........................................................................1-2
1-4 ADFM Components Overview..................................................................................1-3
1-4.1 What is an ADFM? ..............................................................................................1-4
1-4.2 Principles of Operation........................................................................................1-4
1-4.3 User Data Interfaces............................................................................................1-6
Equipment Setup and Installation .........................................................2-1
2-1 Introduction...............................................................................................................2-1
2-2 Initial Inspection........................................................................................................2-2
2-3 System Interconnection............................................................................................2-2
2-3.1 Connecting the Transducer Cable to the Electronics Unit...................................2-3
2-3.2 Power Supply to the ADFM .................................................................................2-3
Power Supply Options.........................................................................................2-3
Line Voltage Selection.........................................................................................2-4
Mains (AC) Power Cable.....................................................................................2-4
DC Power Supply Cable......................................................................................2-4
2-3.3 Applying Power....................................................................................................2-5
2-4 Built In Tests (BITs)..................................................................................................2-5
2-4.1 Testing Interval....................................................................................................2-5
2-4.2 Test Record.........................................................................................................2-5
2-4.3 Power-UP BIT Procedure/Sequence...................................................................2-6
2-5 Final Preparations for Use........................................................................................2-6
2-5.1 Measure Pipe or Channel Geometry...................................................................2-6
2-5.2 Prepare Installation Hardware.............................................................................2-7
2-5.3 Install Software and Configure Station File .........................................................2-8
2-5.4 Installing and Deploying the ADFM.....................................................................2-9
2-6 Packaging and Shipping the ADFM .........................................................................2-9
2-6.1 Tagging For Service............................................................................................2-9
2-6.2 Packaging............................................................................................................2-9
Software Operation.................................................................................3-1
3-1 Introduction...............................................................................................................3-1
3-2 Computer Requirements..........................................................................................3-1
3-3 WinADFM.................................................................................................................3-2
3-3.1 Related Files........................................................................................................3-2
3-4 Using BBTALK .........................................................................................................3-4
3-4.1 Running BBTALK ................................................................................................3-4
3-4.2 BBTALK Help ......................................................................................................3-4
3-4.3 Wakeup the ADFM..............................................................................................3-5
3-4.4 Communication Parameters................................................................................3-5
3-4.5 BBTALK LOG Files..............................................................................................3-6
ADFM Technical Manual (January 2000) v

Table of Contents
Maintenance ............................................................................................4-1
4-1 Introduction...............................................................................................................4-1
4-2 Desiccant..................................................................................................................4-1
4-3 Battery Replacement................................................................................................4-2
4-3.1 Replacing the Alkaline Lantern System Batteries................................................4-2
4-3.2 Replacing the Lead-Acid System Batteries .........................................................4-3
4-3.3 Recharging The Lead-Acid System Batteries......................................................4-3
4-3.4 Replacing The Real Time Clock Backup Battery.................................................4-4
4-4 Fuse Replacement...................................................................................................4-4
4-5 Changing Mains Supply Voltage..............................................................................4-5
4-6 Replacement Parts...................................................................................................4-6
ADFM Test Procedures...........................................................................5-1
5-1 Introduction...............................................................................................................5-1
5-2 Test Setup................................................................................................................5-1
5-3 Built-In Diagnostic Tests...........................................................................................5-2
5-3.1 Automatic Built-In Test Test ................................................................................5-2
5-4 Using BBTALK to Test the ADFM............................................................................5-3
5-4.1 Diagnostic Tests..................................................................................................5-3
5-4.2 Receive Path Test...............................................................................................5-4
5-4.3 Transmit Test.......................................................................................................5-5
5-4.4 Sensor Test.........................................................................................................5-6
5-4.5 Modem Test.........................................................................................................5-7
5-4.6 Recorder Test......................................................................................................5-7
5-5 Using WinADFM to Test the ADFM..........................................................................5-8
5-5.1 Connect...............................................................................................................5-8
5-5.2 Bench Test ..........................................................................................................5-8
5-5.3 Field Test.............................................................................................................5-9
ADFM Troubleshooting ..........................................................................6-1
6-1 Introduction...............................................................................................................6-1
6-2 Equipment Required.................................................................................................6-2
6-3 Power On Fault Isolation..........................................................................................6-3
6-4 Fault Isolation...........................................................................................................6-3
6-5 Least Replaceable Assembly Fault Isolation............................................................6-6
6-5.1 Built-in Test is Not Executing...............................................................................6-6
Communication....................................................................................................6-6
6-5.2 Power ..................................................................................................................6-7
6-5.3 BIT Determines a Problem Associated with the Transducer.............................6-10
ADFM System Overview........................................................................A-1
A-1 Introduction.............................................................................................................. A-1
A-2 Electronics Unit Circuit Description......................................................................... A-1
A-2.1 Power Supply System......................................................................................... A-1
A-2.2 Receiver ............................................................................................................. A-2
A-2.3 Timing Generator................................................................................................ A-3
A-2.4 Central Processing Unit...................................................................................... A-3
A-2.5 User Interface..................................................................................................... A-4
A-3 Transducer Electronics Circuit Description ............................................................. A-5
A-3.1 Multiplexer.......................................................................................................... A-5
vi MGD Technologies Inc.

Table of Contents
A-3.2 Transmit Path ..................................................................................................... A-5
A-3.3 Receive Path ...................................................................................................... A-5
A-3.4 Temperature Interface........................................................................................ A-6
A-3.5 Transducer Power Supply.................................................................................. A-6
Specifications.........................................................................................B-1
B-1 Physical Specifications............................................................................................ B-1
B-2 Performance Specifications..................................................................................... B-3
B-2.1 Measurement Precision...................................................................................... B-3
Flow Accuracy.................................................................................................... B-3
Velocity............................................................................................................... B-3
Water Level ........................................................................................................ B-4
B-2.2 Packaging and Environmental............................................................................ B-4
Transducer ......................................................................................................... B-4
Electronics Unit................................................................................................... B-4
Transducer Signal Cable.................................................................................... B-4
Acoustic Frequency............................................................................................ B-4
B-2.3 Data Management.............................................................................................. B-5
ADFM Velocity Profiler™Data Output ................................................................ B-5
ADFM Velocity Profiler™Software ..................................................................... B-5
Data Storage (optional) ...................................................................................... B-5
Data Interfaces................................................................................................... B-6
B-2.4 Power and Frequency ........................................................................................ B-6
Power ................................................................................................................. B-6
ADFM Commands.................................................................................. C-1
C-1 Introduction..............................................................................................................C-1
C-1.1 ADFM Data Communication and Command Format..........................................C-2
C-1.2 Command Input Processing ...............................................................................C-2
C-1.3 Data Output Processing .....................................................................................C-3
C-2 Command Descriptions...........................................................................................C-6
? - Help Menus:..................................................................................................C-7
Break:.................................................................................................................C-7
C-2.1 Control System Commands................................................................................C-8
CA - Communication Timeout.............................................................................C-8
CB - Serial Port Control (Baud Rate/Parity/Stop Bits)........................................C-8
CF - Flow Control: ..............................................................................................C-9
CK - Keep Parameters .....................................................................................C-10
CL – Leapfrog...................................................................................................C-10
CN - Site Number .............................................................................................C-10
CP - Clear BIT Log ...........................................................................................C-10
CR - Retrieve Parameters ................................................................................C-10
CS - Start Pinging (Go).....................................................................................C-11
CT – Turnkey....................................................................................................C-11
CV - Shut Off Voltage....................................................................................... C-12
CZ - Power Down ADFM..................................................................................C-12
C-2.2 Environmental Sensor Commands...................................................................C-13
EA Heading Alignment .....................................................................................C-13
EC - Speed Of Sound.......................................................................................C-13
ED - Depth Of Transducer................................................................................C-13
ADFM Technical Manual (January 2000) vii

Table of Contents
EE - Secondary Depth Max. Probable Error.....................................................C-14
EO - Secondary Depth Zero Offset...................................................................C-14
ER - Secondary Depth Span ............................................................................C-14
ES - Salinity......................................................................................................C-15
ET - Temperature .............................................................................................C-15
EX - Coord Transform.......................................................................................C-15
EZ - Sensor Source:.........................................................................................C-17
C-2.3 Modem Commands ..........................................................................................C-18
MC - Modem Command ...................................................................................C-18
MH - Hangup on Ping Start ..............................................................................C-18
MI - Modem Answer Init....................................................................................C-18
MM - Modem Monitor........................................................................................C-19
MN - Dial out Phone Number............................................................................C-20
MO - Check to see if the Modem is OK............................................................C-20
MP - Modem Power..........................................................................................C-20
MT - Modem Terminal ......................................................................................C-21
MZ - Modem Reset...........................................................................................C-21
C-2.4 Performance and Test Commands...................................................................C-22
PA - User Interactive Tests............................................................................... C-22
PC - Diagnostic Tests.......................................................................................C-22
PD - Data Stream Select ..................................................................................C-23
PF - Display Fault Log......................................................................................C-23
PI Run Individual Built-In Tests ........................................................................C-24
PS - Show System Parameters........................................................................C-24
PT - Built-In Tests.............................................................................................C-25
PT0 – Help........................................................................................................C-26
PT1 – Board Level Receive Test......................................................................C-27
PT2 - Ancillary System Data.............................................................................C-28
PT3 - Receive Path ..........................................................................................C-28
PT4 - Transmit Path .........................................................................................C-29
PT5 - Electronics Wrap Around........................................................................C-30
PT6 – Receive Bandwidth ................................................................................C-31
PT8 - Checksum Lookup Tables......................................................................C-32
C-2.5 Discharge Commands......................................................................................C-33
QB - Bed Level .................................................................................................C-33
QC - Channel Type...........................................................................................C-33
QD - Algorithm Select.......................................................................................C-33
QF - Force Depth..............................................................................................C-34
QH - Pipe Heights/Epsilons..............................................................................C-34
QO - Transducer Offset from Pipe Bottom .......................................................C-34
QP - Disc Params.............................................................................................C-35
QR - QVD Structure Only Rate.........................................................................C-35
QU - Channel Geometry Units..........................................................................C-35
QW - Pipe Widths/Radii.................................................................................... C-36
QZ - Zero Discharge Accumulation ..................................................................C-36
C-2.6 Recorder Commands .......................................................................................C-37
RA - Number Of Deployments Recorded .........................................................C-37
RB - Blank Check Megabyte # .........................................................................C-38
RD - Current Deployment Selected..................................................................C-39
RE - Erase Recorder ........................................................................................C-39
RJ - Number Of Ensembles To Jump...............................................................C-39
viii MGD Technologies Inc.

Table of Contents
RS - Recorder Space Used/Free......................................................................C-40
RT - Recorder Bit..............................................................................................C-41
RY - Start YModem...........................................................................................C-42
C-2.7 Timing Commands ...........................................................................................C-43
TE - Time Per Ensemble ..................................................................................C-43
TF - Time Of First Ping..................................................................................... C-43
TP - Time per Ping ...........................................................................................C-44
TS - Set Real-Time Clock.................................................................................C-45
C-2.8 Vertical Beam Commands................................................................................C-46
VC - Proofing of depth......................................................................................C-46
VD - Data Out................................................................................................... C-46
VM - Surface Track Mode.................................................................................C-46
VN - Vertical Beam Number Of Depth Cells.....................................................C-47
VP - Pings per Ensemble .................................................................................C-47
VS - Vertical Beam Depth Cell Size .................................................................C-47
VX - Vertical Beam Transmit Length ................................................................C-47
C-2.9 Water-Profiling Commands ..............................................................................C-48
WC - Correlation Threshold.............................................................................. C-48
WD - WT Data Out ...........................................................................................C-48
WE - Error Velocity Threshold.......................................................................... C-48
WF - WT Blank After Transmit..........................................................................C-49
WG - Percent Good Minimum...........................................................................C-49
WM - WT Profiling Mode ..................................................................................C-49
WN - WT Number Of Depth Cells.....................................................................C-50
WO - Single Beam Mode Select.......................................................................C-50
WP - WT Pings Per Ensemble .........................................................................C-50
WS - WT Depth Cell Size .................................................................................C-50
WV - WT Mode 1 Ambiguity Velocity................................................................C-51
ADFM Hot Tap Insertion........................................................................ D-1
ADFM Analog Output Module ............................................................... E-1
ADFM Technical Manual (January 2000) ix

Table of Contents
List of Figures
Figure 1-1. ADFM Components......................................................................................................1-3
Figure 1-2. Typical ADFM installation.............................................................................................1-4
Figure 1-3. ADFM Beam Geometry................................................................................................1-5
Figure 2-1. ADFM System Interconnection ....................................................................................2-2
Figure 2-2. Pipe Geometry and Parameters...................................................................................2-7
Figure 2-3. Transducer Orientation ................................................................................................2-8
Figure 3-1. BBTALK Menu..............................................................................................................3-4
Figure 3-2. BBTALK Help Screen...................................................................................................3-4
Figure 3-3. BBTALK Communication Setup Menu..........................................................................3-5
Figure 3-4. BBTALK Log File..........................................................................................................3-6
Figure 4-1. ADFM Electronic Housing (Exterior View) – Replaceable Parts Identification .............4-7
Figure 4-2. ADFM Electronic Housing (Interior View) – Replaceable Parts Identification...............4-8
Figure 5-1. WinADFM Operate Dialog Window..............................................................................5-8
Figure A-1. Electronics Unit Block Diagram................................................................................... A-7
Figure A-2. Transducer Block Diagram.......................................................................................... A-9
Figure B-1. ADFM Transducer Dimensions ................................................................................... B-2
Figure B-2. ADFM Field Housing Dimensions ............................................................................... B-3
Figure C-1. Pipe Heights/Epsilons............................................................................................... C-34
List of Tables
Table 1-1: User Data Interface Types ...........................................................................................1-6
Table 4-1: List of ADFM Replacement Parts.................................................................................4-6
Table 6-1: List of Least Replaceable Assemblies..........................................................................6-1
Table 6-2: Required Test Equipment.............................................................................................6-2
Table 6-3: List of Test Points.........................................................................................................6-9
Table A-1: Electronics Unit Block Diagram Legend...................................................................... A-8
Table A-2: Transducer Block Diagram Legend........................................................................... A-10
Table C-1: ADFM Commands.......................................................................................................C-3
Table C-2: ADFM Command Groups............................................................................................ C-6
Table C-3: CMD Description......................................................................................................... C-9
Table C-4: Coordinate Transformation Processing Flags........................................................... C-16
Table C-5: Sensor Source Switch Settings................................................................................. C-17
Table C-6: Data Stream Selections.............................................................................................C-23
Table C-7: Error Code Hex to Binary Conversion....................................................................... C-26
xMGD Technologies Inc.

Table of Contents
NOTES
ADFM Technical Manual (January 2000) xi

Table of Contents
xii MGD Technologies Inc.

Introduction to the ADFM Velocity Profiler™
Chapter
1
Introduction to the ADFM Velocity Profiler™
1-1 Overview
This technical manual is intended to be the detailed reference for the ADFM
Velocity Profiler™ (ADFM), using the firmware version listed on the title
page. This manual contains information on ADFM setup, operation, data
retrieval, maintenance, testing, and troubleshooting.
1-2 Getting Started
Please take the time to read these instructions. We have tried to make the
ADFM and it’s manual easy to use. Before using the ADFM to collect real
data:
•Page through this manual to become familiar with its contents;
•Familiarize yourself with ADFM components by looking at dia-
grams;
•Use Chapter 2 to install, connect, test, and deploy the ADFM;
•Use Chapter 3 to issue software commands and begin collecting
data;
•Use Chapter 4 as a maintenance and troubleshooting guide;
•Use Appendices for additional reference.
ADFM Technical Manual (January 2000) page 1-1

Chapter 1
If you have questions pertaining to a specific ADFM system installed,
please have the following information on hand before contacting us:
Serial # of Electronics Unit and
Transducer: Technical Support will need to know the serial number to obtain the sys-
tem’s configuration before they can
help you.
Contents of the WinADFM con-
figuration file: We need to know the setup of the ADFM, and site details.
A detailed description of the
problem: Try to answer what happened and when it happened. What were the cir-
cumstances leading to the problem. Be
as detailed as possible.
1-3 General Operation
Before applying mains power, verify that the power entry module voltage
selection matches the available line voltage, the correct fuse is installed, and
safety precautions are taken.
1-3.1 General Warnings and Cautions
This section contains a list of items you should be aware of every time you
use your ADFM. Please refer to this list often.
•Before mains power is supplied to the ADFM, the protective
earth (ground) terminal of the instrument must be connected to
the protective conductor of the mains power cord. The mains
plug shall only be inserted in a socket outlet provided with a pro-
tective earth contact. The protective action must not be negated
by the use of an extension cord (power cable) without a protec-
tive conductor (grounding). Grounding one conductor of a two-
conductor outlet is not sufficient protection.
•Servicing instructions are for use by service-trained personnel. To
avoid dangerous electric shock, do not perform any service un-
less qualified to do so.
•If this instrument is to be supplied via an auto-transformer, make
sure the common terminal is connected to the earth terminal of
the power source.
•Any interruption of the earthing (grounding) conductor, inside or
outside the instrument, or disconnecting the protective earth ter-
minal will cause a potential shock hazard that could result in
personal injury.
page 1-2 MGD Technologies, Inc.

Introduction to the ADFM Velocity Profiler™
•Only fuses with the required rated current, voltage, and specified
type should be used. Do not repair fuses or short circuit fuse-
holders. To do so could cause a shock or fire hazard.
•Do not install substitute parts or perform any unauthorized modi-
fications to the instrument.
•Certain test measurements described in the manual are performed
with power supplied to the instrument while protective covers
are removed. Energy available at many points may, if contacted,
result in personal injury.
•Any maintenance and repair of the opened instrument under volt-
age should be avoided as much as possible, and when inevitable,
should be carried out only by a skilled person who is aware of
the hazards involved.
•Capacitors inside the instrument may still be charged even if the
instrument has been disconnected from its source of supply.
1-4 ADFM Components Overview
Figure 1-13 illustrates the three major components of a ADFM system. Two
components are installed at each site: a transducer, installed in the bottom
of a pipe or channel, and its Electronics Unit, installed nearby in a non-
hazardous atmosphere. These two components communicate with the third
system component, a remote host IBM compatible PC computer, either via
a Modem, or a serial data interface (RS-232 or RS-422).
Laptop computer
Computer with Modem
TransducerTransducer cable
Telephone line
Serial cable
Figure 1-1. ADFM Components
ADFM Technical Manual (January 2000) page 1-3

Chapter 1
To allow measurements close to the bottom of the pipe or channel and to
minimize debris collection on the transducer, the ADFM transducer is de-
signed to have a low profile. It therefore contains a minimum of required
electronics. The Electronics Unit and transducer contain all circuitry and
systems needed to measure directional flow, the level within the sewer pipe,
to record results, and to transfer data from and to local or remote locations.
Use of a laptop computer running Windows 95 and the WinADFM software
is recommended for initial setup of the ADFM on-site. Subsequent data
collection and re-programming may be performed locally or remotely via
modem if a telephone telemetry connection is available.
1-4.1 What is an ADFM?
The ADFM Velocity Profiler™(ADFM) is a flow meter based on the Dop-
pler principle. The ADFM consists of a transducer assembly mounted in the
flow, a signal processing unit and an interface cable
1-4.2 Principles of Operation
Figure 1-24 shows a typical ADFM installation for measuring open channel
flow in a pipe. A transducer assembly is mounted on the invert of a pipe or
channel. Piezoelectric ceramics emit short pulses along narrow acoustic
beams pointing in different directions. Echoes of these pulses are backscat-
tered from material suspended in the flow. As this material has motion rela-
tive to the transducer, the echoes are Doppler shifted in frequency. Meas-
urement of this frequency enables the calculation of the flow speed. A fifth
ceramic mounted in the center of the transducer assembly, and aimed verti-
cally, is used to measure the depth.
Depth cells
Flow pattern
transducer
Velocity Profile #1
Velocity Profile #2
Figure 1-2. Typical ADFM installation
page 1-4 MGD Technologies, Inc.

Introduction to the ADFM Velocity Profiler™
The ADFM divides the return signal into discrete regular intervals that cor-
respond to different depths in the flow. Velocity is calculated from the fre-
quency shift measured in each interval. The result is a profile, or linear dis-
tribution of velocities, along the direction of the beam. Each of the small
black circles in Figure 1-24 represent an individual velocity measurement in
a small volume known as a depth cell.
The directions of the velocity profiles in Figure 1-24 are based on the ge-
ometry of the ADFM’s transducer assembly. Figure 1-35 shows a side view
of the transducer assembly. The profiles shown in Figure 1-24 are gener-
ated from velocity data measured by an upstream and downstream beam
pair. The data from one beam pair are averaged to generate Profile #1, and
a beam pair on the opposite side of the transducer assembly generates Pro-
file #2.
Since Doppler measurements are directional, only the component of veloc-
ity along the direction of transmit and receive is measured, as shown in
Figure 1-35. Narrow acoustic beams are required to accurately determine
the horizontal velocity from the measured component. The narrow acoustic
beams of the ADFM insure that this measurement is accurate. Also, the
range-gate times are short and the depth cells occupy a small volume - cyl-
inders approximately 5 centimeters (2 inches) long and 5 centimeters (2
inches) in diameter. This insures that the velocity measurements are truly
representative of that portion of the flow. Potential bias in the return energy
spectrum due to range dependent variables is avoided. The result is a very
precise measurement of the vertical and transverse distribution of flow ve-
locities.
Flow Velocity Vector
Vector Component
Figure 1-3. ADFM Beam Geometry
The velocity data from the two profiles are entered into an algorithm to de-
termine a mathematical description of the flow velocities throughout the
ADFM Technical Manual (January 2000) page 1-5

Chapter 1
entire cross-section of the flow. The algorithm fits the basis functions of a
parametric model to the actual data. The result predicts flow velocities at
all points throughout the flow. These results are integrated over the cross-
sectional area to determine the discharge.
The key benefit to this approach is that the system will operate accurately
under different hydraulic conditions. As hydraulic conditions change, the
change will manifest itself in the distribution of velocity throughout the
depth of flow. As the ADFM is measuring the velocity distribution directly,
it will adapt to the changes in hydraulics, and generate a flow pattern that is
representative of the new hydraulic conditions, insuring an accurate esti-
mate of flow rate.
1-4.3 User Data Interfaces
The ADFM has three user data interfaces, which are listed in Table 1-16 be-
low.
Table 1-1: User Data Interface Types
Type: Description:
RS-232 Serial Data Interface, EIA standard RS-232C, used for local data
communication with the ADFM. Not to be used over distances more
than 15 meters. Maximum baud rate is 57600 Baud.
RS-422 Serial Data Interface, EIA standard RS-422, used for local or remote
data communication over distances up to 1.2 km. Maximum Baud rate
is 115 kBaud.
Modem 28800 bps Modem with data compression and error correction
capabilities, used for remote data communication with the ADFM.
For a complete set of specifications for the serial data interfaces please refer
to the EIA specifications. For more information on available modems,
please contact MGD Technologies Inc.
page 1-6 MGD Technologies, Inc.