Sierra M100L User manual

Sierra Instruments Instruction Manual Smart-Trak®2 Series 100
1
Smart-Trak®2 Series 100
Mass Flow Meters and Controllers
INSTRUCTION MANUAL
IM-100-ST2, Revision: D
January 2012

Sierra Instruments Instruction Manual Smart-Trak®2 Series 100
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GLOBAL SUPPORT LOCATIONS: WE ARE HERE TO HELP!
CORPORATE HEADQUARTERS
5 Harris Court, Building L Monterey, CA 93940
Phone [phone] [phone] Fax [phone]
www.sierrainstruments.com
EUROPE HEADQUARTERS
Bijlmansweid 2 1934RE Egmond aan den Hoef
The Netherlands
Phone [phone] Fax [phone]
ASIA HEADQUARTERS
Rm. 618, Tomson Centre, Bldg A, 188 Zhang Yang Road
Pu Dong New District, Shanghai, P.R. China
Phone: + 8621 5879 8521 Fax: [phone]
IMPORTANT CUSTOMER NOTICE: OXYGEN SERVICE
Sierra Instruments, Inc. is not liable for any damage or personal injury, whatsoever, resulting from the use of
Sierra Instruments standard mass flow meters or controllers for oxygen gas. You are responsible for
determining if this mass flow meter or controller is appropriate for your oxygen application. You are
responsible for cleaning the mass flow meter or controller to the degree required for your oxygen flow
application.
© COPYRIGHT SIERRA INSTRUMENTS 2010
No part of this publication may be copied or distributed, transmitted, transcribed, stored in a retrieval system,
or translated into any human or computer language, in any form or by any means, electronic, mechanical,
manual, or otherwise, or disclosed to third parties without the express written permission of Sierra Instruments.
The information contained in this manual is subject to change without notice.
TRADEMARKS
Smart-Trak®100 Series and Dial-A-Gas™ is a Registered Trademark of Sierra Instruments, Inc. Other
product and company names listed in this manual are trademarks or trade names of their respective
manufacturers.

Sierra Instruments Instruction Manual Smart-Trak®2 Series 100
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Table of Contents
Chapter 1: Introduction.................................................................................................... 5
Welcome to the future of gas flow measurement!......................................................... 5
Using This Manual................................................................................................................. 5
Safety Information................................................................................................................. 6
Receipt of your instrument..................................................................................................... 7
The Smart-Trak 2 Flow Sensing Principle............................................................................. 9
Chapter 2: Installation....................................................................................................... 9
Before You Begin Installation............................................................................................. 11
Pre-Installation Check List .................................................................................................. 12
Installing the Instrument—Plumbing................................................................................... 12
Compression Fittings..................................................................................................... 13
VCO Fittings................................................................................................................... 13
VCR Fittings................................................................................................................... 14
1/4 Inch Female NPT..................................................................................................... 14
Installing your Instrument—Mechanical Mounting ............................................................ 15
Installing your Instrument—Electrical Connections ........................................................... 16
Figure 2-3: HD DB-15 Connector Pin Configuration (on the instrument).................. 18
Figure 2-4: Wiring Definitions for Optional Communication Cable........................... 18
Figure 2-5: Power Supply Requirements......................................................................... 19
Chapter 3: Analog Operation .................................................................................... 22
Analog Operation, Mass Flow Controller........................................................................ 23
Smart-Trak 2 Features...................................................................................................... 24
Setpoint Adjustment......................................................................................................... 24
Changing the Output or Setpoint Signals......................................................................... 24
Over-Range Condition..................................................................................................... 24
Manual Valve Override—Valve Close............................................................................ 25
Manual Valve Override—Valve Purge Function ............................................................ 25
Important Notes About Purging....................................................................................... 25
Purging Non-Reactive Gases:.......................................................................................... 25
Purging Reactive Gases:.................................................................................................. 25
Chapter 4: Digital Operation with Pilot Module...................................................... 27
Introduction to Pilot Module Features and Capabilities.................................................. 27
Pilot Module Operation, Mass Flow Controllers................................................................. 29
Pilot Module Operation, Mass Flow Controllers:................................................................ 30
Making Changes Using the Lower Level Screens:...................................................................... 38
Lost Passwords and General Customer Service:....................................................................... 47
Chapter 5: Digital Operation RS-232 & Smart-Trak 2 Software ...................... 48
Power Up Your Instrument ......................................................................................... 48
Power Up Your Computer .......................................................................................... 51
Loading the Smart-Trak 2 Software ........................................................................... 51
Connecting Smart-Trak 2 to Your Computer ............................................................. 52

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If your computer has a serial port….................................................................................... 51
If your computer has no serial port, but has a USB port….................................................. 53
If you plan to control more than one Smart-Trak 2 instrument from your computer…...... 53
Running The Smart-Trak 2 Software............................................................................... 55
Chapter 6: Technical Support & Service.................................................................. 68
Factory Calibration—All Models.................................................................................... 70
Instructions for Returning Your Instrument for Service.................................................. 70
Appendix A: Gas Tables & K-Factors
Appendix B: Product Specifications
Appendix C: Flow Chart for Pilot Module User Interface
Appendix D: PIN Configuration
Appendix E: Product Dimensions and Mounting
Appendix F: Micro-Trak
Appendix G: Smart-Trak Basic Commands

Sierra Instruments Instruction Manual Smart-Trak®2 Series 100
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CHAPTER 1: INTRODUCTION
Welcometothefutureofgasflowmeasurement!
This manual is your guide to Smart-Trak 2. Visit the Sierra Instruments website
www.sierrainstruments.com any time for more information about this product.
The Smart-Trak 2 instruments offer a variety of features for ease of operation.
Among these features:
9Dial-A-Gas: allows a user to change from among 10 gases while maintaining
accuracy.
9The Optional Pilot Module: control electronics that offers both display and
control options at the user’s fingertips.
9Digital Electronics: maximum performance with minimum noise plus
exceptional tuning capability.
9Choice of Analog Communications Options and RS-232 with every Smart-
Trak 2 instrument.
9Flexible Design with many functions that can be re-configured on-site by the
user.
9Compact Footprint that allows Smart-Trak 2 to fit almost anywhere.
9Wide range of sizes for gas flow from 0.1 sccm to 1400 slpm.
9And many more
Using This Manual
This manual is organized into six chapters:
•Chapter 1: Introduction and Theory of Operation.
•Chapter 2: Installation, Plumbing & Wiring instructions.
•Chapter 3: Analog Operation.
•Chapter 4: Digital Operation with the Optional Pilot Module.
•Chapter 5: Digital Operation with RS-232 & Smart-Trak 2 Software.
•Chapter 6: Technical Support and Service.

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There are also 6 Appendices:
•Appendix A: Smart-Trak 2 Pre-Programmed gases, Conversion
Formula and Gas Tables.
•Appendix B: Product Specifications, useful Optional Parts &
Accessories
•Appendix C: Flowchart for the Pilot Module.
•Appendix D: PIN Configuration of the mini-D connector
•Appendix E: Dimensional Drawings & Mounting Instructions
•Appendix F: Special Instructions for Installation and Operation of the
Micro-Trak ultra-low flow instruments.
Throughout this manual, we use the word instrument as a generic term to
represent all models of Sierra Instruments’ Smart-Trak 2 Series 100 mass flow
meters and controllers.
SAFETY INFORMATION
Caution and warning statements are used throughout this book to draw your
attention to important information.
Warning!
Caution!
This statement appears with information that
is important to protect people and equipment
from damage. Pay very close attention to all
warnings that apply to your application.
This statement appears with information that is
important for protecting your equipment and
performance. Read and follow all cautions that
apply to your application.

Sierra Instruments Instruction Manual Smart-Trak®2 Series 100
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RECEIPT OF YOUR INSTRUMENT
When receiving the instrument, carefully check the outside packing carton for
damage that may have incurred during shipment. If the carton is damaged, notify
the local carrier and submit a report to the factory or distributor. Remove the
packing slip and check that all ordered components are present and match your
specifications (as ordered). Make sure any spare parts or accessories are not
discarded with the packing material. Do not return any equipment to the factory
without first contacting one of Sierra’s Technical Support Centers:
USA (Headquarters) Customer Service:
TOLL FREE: 800-866-0200
PHONE: [phone]
FAX: [phone]
EMAIL: [email protected]
European Customer Service:
PHONE: [phone]
FAX: [phone]
EMAIL: [email protected]
Asia Customer Service:
PHONE: + 8621 5879 8521
FAX: [phone]
EMAIL: www.sierra-asia.com

Sierra Instruments Instruction Manual Smart-Trak®2 Series 100
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DEFINITIONS USED IN THIS MANUAL
The following terms are used frequently in this manual. They are presented here
with their definitions for your information.
Setpoint—The command or control signal supplied to a flow controller is called its
setpoint. The controller will maintain the flow at this value.
Full scale—The highest flow that an instrument will meter within its specified
accuracy. It is often possible for an instrument to measure a flow beyond its full
scale value, but the accuracy of this measurement may be outside of published
specifications.
Purge—The Smart-Trak 2 Mass Flow Controller is supplied with the ability to open
the valve far beyond the full scale position to allow them to be cleaned. This is
usually accomplished by blowing clean, dry nitrogen through the instrument. When
the valve is opened to this cleaning position, it is said to be in the Purge mode.
LFE—Laminar Flow Element (LFE) or bypass generates pressure drop forcing a
small fraction of the total flow to pass through the sensor capillary tube.

Sierra Instruments Instruction Manual Smart-Trak®2 Series 100
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THE SMART-TRAK 2 FLOW SENSING PRINCIPLE
The operating principle of the Smart-Trak 2 instruments is based on heat transfer
and the first law of thermodynamics. During operation process gas enters the
instrument’s flow body and divides into two flow paths, one through the sensor
tube, and the other through the laminar flow bypass. The laminar flow bypass (often
called LFE which stands for “laminar flow element”) generates a pressure drop, P1–
P2, forcing a small fraction of the total flow to pass through the sensor tube (m1).
Figure 1-1. Flow Paths through the Instrument
Two resistance temperature detector (RTD) coils around the sensor tube direct a
constant amount of heat (H) into the gas stream. During operation, the gas mass
flow carries heat from the upstream coil to the downstream coil. The resulting
temperature difference (∆T) is measured by the Smart-Trak 2 microprocessor.
From this, Smart-Trak 2 calculates the output signal. Since the molecules of the gas
carry away the heat, the output signal is linearly proportional to gas mass flow.
Figure 1-2. Flow Measuring Principle

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Figure 1-3. Sensor Temperature Distribution
Figures 1-2 and 1-3 show the mass flow through the sensor tube as inversely
proportional to the temperature difference of the coils. The coils are legs of a bridge
circuit with an output voltage in direct proportion to the difference in the coils’
resistance; the result is the temperature difference (∆T). Two other parameters, heat
input (H) and coefficient of specific heat (Cp) are both constant. Through careful
design and attention to these parameters, this output signal is made linear over the
transducer’s normal operating range (Figure 1-4). As a result, the measured flow
through the sensor tube is directly proportional to the gas flow in the main body.
Figure 1-4. Linear Range of the Transducer’s Output Signal
In the Smart-Trak 2 mass flow controllers, the gas which flows through the
monitoring section is precisely regulated by the built-in electromagnetic valve. The
normally closed valve is similar to an on/off solenoid valve, except that the current
to the valve coil, and hence the magnetic field, is modulated so that the
ferromagnetic valve armature, or valve plug, assumes the exact height above the
valve’s orifice required to maintain the valve’s command flow (set point). The
result is excellent resolution.

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CHAPTER 2 INSTALLATION
Before You Begin Installation
Before installing the instrument, ensure that the installation site conforms to the
specific operating parameters recorded on the instrument’s Data Label. The Data
Label is mounted on the back of the instrument electronics enclosure (see sample
Data Labels in Figure: 2-1). This is critical because each instrument is configured
for a specific application range. Please review the gas or gases, the mounting
orientation, the maximum flow range(s), the inlet and outlet pressure(s), and the
operating temperature(s). The line pressure should not exceed 500 psig (34 barg).
The temperature should not exceed 122°F (50°C). The minimum operating
temperature is 32°F (0°C) and ambient temperature is 0-50°C. If your application
exceeds any of these parameters, contact your Sierra Sales Agent before
installation. You may also contact one of Sierra’s Technical Support Centers.
FACTORY USA: TOLL FREE: 800-866-0200 or PHONE: [phone] or FAX:
831-373-4402 or EMAIL: [e-mail]
Figure 2-1: Examples of Smart-Trak 2 Data Labels
 
Warning!
Injury can result if line
pressure exceeds the
maximum rating of
500 psig (34 barg).

Sierra Instruments Instruction Manual Smart-Trak®2 Series 100
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Pre-Installation Check List
1. Double-check to be sure that the O-ring material used in your
instrument is compatible with the gas to be measured. The O-ring
material used in your Smart-Trak 2 can be found in the Data Label. See
Appendix A for a table of elastomer compatibility with a wide variety of
gases.
2. Sierra strongly recommends you install an in-line filter upstream of the
instrument. Recommended filter size: 10 micron. A 10 micron filter is
available from Sierra as an accessory. See Appendix B or contact your local
Sierra distributor.
3. Do not locate the instrument in areas subject to sudden temperature
changes, excessive moisture or near equipment radiating significant
amounts of heat. Be sure to allow adequate space for cable connectors and
wiring.
4. For controllers, use a properly sized pressure regulator. Make sure the
pressure regulator is not too small or too big. There can be no restrictions
(such as valves, tubing or pipe internal diameters, reducers, etc.) upstream or
downstream of the controller with a dimension that is less than the valve
orifice diameter. To determine orifice diameter, consult the calibration
certificate included with your instrument. If restricted, controller will not
reach full scale.
5. Output Signals: The Smart-Trak 2 has two analog outputs that are linearly
proportional to the gas mass flow rate, one voltage and one current. Choose
from 0-20 mA or 4-20 mA for current plus one voltage signal: 0-5 VDC or
0-10 VDC or 1-5 VDC. The output signals specified at time of order will be
indicated on the data label. You may change among the current and the
voltage output signal at your discretion after receipt of the instrument using
the Pilot Module or the Smart-Trak 2 Software (see Chapters 4 & 5).
Changing the output signals has no influence on the instrument’s accuracy.
6. The CAT-5 connector on the side of the Smart-Trak 2 is NOT an Ethernet
connector. It is for use with the optional Remote Pilot Module. Do not plug
an Ethernet cable here as damage may result. Keep this connector covered if
possible whenever it is not in use.
7. The instrument has specific power supply requirements. See the table
later in this chapter for a complete listing of power requirements.
Installing the Instrument—Plumbing
Smart-Trak 2instruments are supplied with compression, VCO®, VCR®, or female
NPT process connections. To ensure a successful installation, inlet and outlet tubing

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should be clean prior to plumbing the instrument into the system. The shipping caps
covering the inlet/outlet fittings should not be removed until immediately before
installation.
Follow the installation instructions that are applicable to your instrument’s process
connection. Ensure that the tubing is free from burrs or sharp rims that may result
from cutting.
CAUTION: Before use, all plumbing should be checked carefully for leaks,
especially at the connecting fittings. All instruments are leak-tested prior to
shipping. It is not a requirement to leak test your instrument. Do not use liquid
leak detectors such as Snoop®to search for leaks inside or outside the Smart-
Trak 2. Instead, monitor pressure decay.
Compression Fittings
1. Position the instrument with the
flow direction arrow pointing in the
direction of flow.
2. Verify the position of the front and
back ferrule. Insert the tubing into
the fitting. Be sure that the tubing rests firmly on the shoulder of the fitting
and that the nut is finger-tight. Scribe the nut at the six o’clock position.
3. While holding the fitting body steady with a backup wrench, tighten the nut
1-1/4 turns, watching the scribe mark make one complete revolution and
continue to the nine o’clock position. For 1/16-inch, 1/8-inch and 3/16-inch
(2, 3 and 4 mm) sizes, tighten only 3/4 turns from finger-tight. Do not over-
tighten!
4. If you use flexible tubing (Example: Polyflow) use an “Insert” (see
www.swagelok.com)
5. Check the system’s entire flow path thoroughly for leaks. Do not use liquid
leak detectors. Instead, monitor pressure decay. Exposing the instrument to
leak detector fluid may cause damage.
VCO Fittings
1. Position the instrument with the flow direction arrow pointing in the
direction of flow.
2. Tighten the nut finger-tight, and then 1/8 turn tighter with a wrench. Do not
over-tighten!

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3. Check the system’s entire flow path thoroughly for leaks. Do not use liquid
leak detectors. Instead, monitor pressure decay. Exposing the instrument to
leak detector fluid may cause damage.
VCR Fittings
1. Position the instrument with the flow direction arrow pointing the direction
of flow.
2. Install new gaskets that are compatible with the gas to be used.
3. Tighten the nut finger-tight, and then 1/8 turn tighter with a wrench. Do not
over-tighten!
4. Check the system’s entire flow path thoroughly for leaks. Do not use liquid
leak detectors. Instead, monitor pressure decay. Exposing the instrument to
leak detector fluid may cause damage.
1/4InchFemaleNPT
1. Position the instrument with the flow direction arrow pointing the direction
of flow.
2. Apply high quality Teflon tape to the male NPT fitting. Alternatively, use a
high quality paste pipe thread sealant suitable for the application and gas,
and apply this compound to the inlet and outlet fittings. Avoid getting the
tape or the thread sealant onto the first two threads to keep it out of your
process gas.
3. Tighten each fitting by hand. Then, tighten no more than one (1) turn. Do
not over-tighten.
4. Check the system’s entire flow path thoroughly for leaks. Do not use liquid
leak detectors. Instead, monitor pressure decay. Exposing the instrument to
leak detector fluid may cause damage.

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Installing your Instrument—Mechanical Mounting
Mounting your Instrument
The base plate or bottom of the instrument has 4 mounting holes. Two are SAE
thread and two are metric thread. For location and dimensions, please see Appendix
E.
Your Smart-Trak 2 instrument is made from premium 316 stainless steel. As a result,
it may require substantial mounting brackets to properly support its weight. Exercise
caution when installing to avoid damage or injury.
Mounting the Optional Remote Pilot Module
If you have the optional Remote Pilot Module control unit, you have several
mounting options.
1. Wall or Panel mounting—your Remote Pilot Module may be mounted to a
flat surface using the supplied plate and 2 special “shoulder” screws.
Simply screw the shoulder screws into the plate. Then, attach the plate to
the wall by driving 2 screws (not included) through the 2 large central holes.
MAKE SURE THE UP ARROW IMPRINTED ON THE MOUNTING
BRACKET POINTS UPWARD. Your Remote Pilot Module will slip onto
the shoulder screws. Push against the plate and then down. To remove,
push up and pull. Attach the CAT-5 cable to the socket on the bottom of the
Remote Pilot Module.
2. Rack mounting—to mount your Remote Pilot Module to a standard 19”
laboratory rack, first purchase a “blank” panel from your industrial supplier.
Decide where the Remote Pilot Module will be attached, then follow the
procedure listed above for wall mounting. When you are ready, insert the
CAT-5 cable into the socket in the Remote Pilot Module.
3. Desktop mounting—the Remote Pilot Module will sit on a desk in a
fashion that makes it convenient to view and operate. Insert the CAT-5
cable into the socket in the back of the Module. Use the cable as a
“kickstand.” Gently bend the cable to recline the Remote Pilot Module to
an angle suitable for easy viewing. Alternately, you can lay the Remote
Pilot Module on its back and insert the CAT-5 cable into the socket in the
bottom.

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Installing your Instrument—Electrical Connections
All electrical connections for your Smart-Trak 2 instrument are made on the left
(inlet) side panel. See Figure 2-2: Smart-Trak 2 Connections below for the location
of all connections. Note that the CAT-5 connector is not an ethernet connector.
Figure 2-2: Smart-Trak 2 connections
CAT 5
HD DB 15

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Smart-Trak 2 is provided with a high density 15-pin D Connector called an “HD
DB-15” located on the side of the enclosure and either one of our optional pre-
assembled communications cables or an empty mating connector. Power must be
supplied to the HD DB-15 connector. Other features may be accessed there as well.
The pin numbers and assignments for the HD DB-15 connector are shown in Figure
2-3: HD DB-15 Connector Pin Configuration (on the instrument). The
corresponding colors of the optional communication cable wires and the functions
of each are listed in Figure 2-4: Wiring Definitions for Optional Communication
Cable. The connections for input power, analog output signal and analog input
signal (controllers only) are all made at the HD DB-15 connector. There is a
second copy of these 2 figures in Appendix D for your convenience

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Figure2‐3:HDDB‐15ConnectorPinConfiguration(ontheinstrument)

Figure2‐4:WiringDefinitionsforOptionalCommunicationCable
Pin # Wire Color in Cable Function
1. Brown Analog Ground/Output
2. Red 0-5 VDC Output (or 0-10, 1-5 VDC)
3. Orange Analog Ground/RS232
4. Pink Valve Override Purge
5. Yellow Power Return (-)
6. Green Power Input (+)
7. Green/White RS-232 Transmit (out)
8. Blue Setpoint
9. Purple Not Used
10. Gray Analog Ground/Setpoint
11. White Reference Voltage
(5 VDC External Setpoint & Valve Purge)
12. Black Valve Override Close
13. Brown/white RS-232 Receive (in)
14. Red/white 4-20 mA Output
15. Red/Black Not Used
Shield Wire
(no insulation) Chassis (Earth) Ground
Note: Pins 1, 3, and 10 are connected together inside the
instrument. Do not tie these grounds together outside the
instrument. Must have one connection per analog ground.
Recommended use listed.

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Instrument Power:
The Smart-Trak 2 requires a 15-24 VDC power supply. If you are using the power
supply supplied by Sierra, connect it to the 15-pin HD DB-15 connector on the side of
the instrument. If you are supplying your own power source, it must be a regulated
15-24 VDC with ripple not to exceed 100 mV peak-to-peak. It must be capable of
producing the current specified for the appropriate voltage shown in Figure 2-5: Power
Supply Requirements. Apply power as follows: positive (+) to the green (pin 6) and
negative (-) to the yellow (pin 5) wires. The instrument is polarity sensitive. If you
reverse this wiring, the instrument will not be damaged, but it will not function.
Instrument Grounding:
The Smart-Trak 2 has very high levels of RFI and EMI shielding built into the metal
electronics cover (meets or exceeds the CE Standard EN 61326-1; 2006). To maintain
the integrity of this CE rating, it is critical that a path be provided for any residual
internal noise to exit the instrument or it may register on the outputs. Grounding
provides this path.
To properly ground your instrument, secure the chassis to solid earth ground using the
mounting holes on the bottom of the flow body. If the instrument will be used without
permanent mounting (on a laboratory bench, for instance) then, using the provided
cable, connect the shield wire (no insulation) to earth ground in your facility. If you
purchased a Sierra power supply, a ground wire is provided for your convenience.
Figure 2-5: Power Supply Requirements
Instrument Type Recommended Input
Voltage Minimum Current Required (mA)
M100L Meter 15-24 VDC (+ 10%) 230
M100M Meter 15-24 VDC (+10%) 230
M100H Meter 15-24 VDC (+10%) 230
C100L Controller 24 + 10% VDC 500
C100M Controller 24 + 10% VDC 800
C100H Controller 24 + 10% VDC 1260
NOTE: The Compod™ adds an additional 100mA to the ST2 current ratings.
CAUTION: This instrument is not a loop-powered device! Do NOT apply power
to the 4-20 mA output or input connections.

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Analog Output Signals:
•Output Signal—Voltage: Measure the voltage output signal across the red (pin 2)
wire and any of the analog grounds: brown (pin 1), orange (pin 3) or gray (pin 10).
The minimum load is 1000 Ohms. We recommend pin 1. DO NOT USE THE SAME
ANALOG GROUND FOR CURRENT OUTPUT, SETPOINT OR RS232.
•Output Signal—Current: Measure the current output signal, 4-20 mA or 0-20 mA,
across the red/white stripe (pin 14) wire and any of the analog grounds: pin 1, 3, or
10. The maximum load is 500 Ohms. We recommend pin 1. DO NOT USE THE
SAME ANALOG GROUND FOR VOLTAGE OUTPUT, SETPOINT OR RS232.
For Mass Flow Controllers, the following analog features are also
available at the HD DB-15 connector:
Setpoint: To transmit an analog setpoint, supply the voltage or current signal (check
the data label and/or setting) across the blue (pin 8) wire and pin 10.
Valve Close: To force the valve closed, connect the black (pin 12) wire to pin 10
Purge: To force the valve to its maximum open position which we call “Purge,”
connect the pink (pin 4) wire to the white (pin 11) wire. Note that this will allow
much greater flow than the rated full-scale value.
For Digital Communication Using Your Personal Computer:
You can communicate with your instrument using the Smart-Trak 2 Softwarepackage and
your PC running the Windows operating system. Simply connect the light green (pin 7)
wire, the brown/white stripe (pin 13) wire and one of the analog grounds (pin 1,3, or 10)
to a standard DB-9 connector according to Figure 2-6: Digital Communication.
Figure 2-6: Digital Communication
RS-232 Transmit (pin 7) to DB-9 pin #2
RS-232 Receive (pin 13) to DB-9 pin #3
Analog ground (pin 3) to DB-9 pin #5