ENDEVCO 4990A User manual

IM4990A
REVISION A
30 July 2002
MODEL 4990A
RACK FOR 400 SERIES AMPLIFIERS
INSTRUCTION
MANUAL
E
San Juan Capistrano, California, USA

ENDEVCO MODEL 4990A RACK
INSTRUCTION MANUAL
i
TABLE OF CONTENTS
1. INTRODUCTION....................................................................................................................................... 1
1.1 SIGNAL CONDITIONERS.................................................................................................................... 1
1.2 COMPUTER CONTROLLED SIGNAL CONDITIONERS...................................................................... 1
1.3 OASIS 2000 Hardware......................................................................................................................... 1
1.4 OASIS 2000 Software .......................................................................................................................... 2
2. DESCRIPTION.......................................................................................................................................... 3
2.1 KEY FEATURES.................................................................................................................................. 3
3. FUNCTIONAL CHARACTERISTICS ......................................................................................................... 4
3.1 General................................................................................................................................................ 4
3.2 Mechanical Characteristics................................................................................................................... 4
3.3 Model 4990A-1: Ethernet Option........................................................................................................... 4
3.4 Model 4990A-2: RS-232 Option............................................................................................................ 5
4. INSTALLATION AND COMMUNICATION................................................................................................. 6
4.1 Unpacking............................................................................................................................................ 6
4.2 Installation............................................................................................................................................ 6
4.3 Default Jumper Settings for Ethernet Rack (4990A-1):.......................................................................... 9
4.4 Default Jumper Settings for RS-232 Rack (4990A-2):........................................................................... 9
5. POWERING UP OF THE RACK ASSEMBLY AND ESTABLISHING COMMUNICATION........................ 10
5.1 Apply Power....................................................................................................................................... 10
5.2 Computer Interface............................................................................................................................. 10
5.3 Installing the OASIS SW2000 Software. (Windows 95/98)................................................................. 10
5.4 Establishing Communication............................................................................................................... 11
6. OPERATION........................................................................................................................................... 19
6.1 Connecting Sensors to OASIS 2000................................................................................................... 19
6.2 Connecting the Analog Outputs.......................................................................................................... 22
7. SAFETY.................................................................................................................................................. 23
7.1 Ground The Instrument ...................................................................................................................... 23
7.2 Do Not Operate In An Explosive Atmosphere ..................................................................................... 23
7.3 Keep away from live circuits ............................................................................................................... 23
7.4 Do Not Service Or Adjust Alone.......................................................................................................... 23
7.5 Do Not Substitute Parts Or Modify Instrument .................................................................................... 23
7.6 Dangerous Procedure Warnings......................................................................................................... 23
7.7 Safety Symbols .................................................................................................................................. 24
7.8 Line Fuse ........................................................................................................................................... 24
7.9 Troubleshooting Tips.......................................................................................................................... 25
8. ROUTINE MAINTENANCE AND HANDLING.......................................................................................... 27
8.1 Introduction ........................................................................................................................................ 27
8.2 Factory Service .................................................................................................................................. 27
8.3 WARRANTY....................................................................................................................................... 27
8.4 OUT-OF-WARRANTY RETURNS...................................................................................................... 27
9. ORDERING INFORMATION & ACCESSORIES...................................................................................... 29
9.1 OASIS Part Numbers ......................................................................................................................... 29
9.2 Model 400 Series Accessories............................................................................................................ 29

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1. INTRODUCTION
ENDEVCO®, a leader in the vibration measurement field since 1951, has contributed many firsts
in vibration sensor design. These include: the first piezoelectric accelerometer capable of
continuous operation from cryogenic temperatures up to +750°F, the first shear design
accelerometer and the world's smallest piezoelectric accelerometer. To support a broad family of
vibration transducers, ENDEVCO has provided a wide variety of signal conditioners, including the
first transistorized charge amplifier, the first computer-programmable charge amplifier and the
first airborne vibration monitoring system that is based on a true digital tracking filter.
Other support systems includes the introduction of the first Laser Interferometer absolute
calibration system. Endevco is a pioneer in the science of Micro-Electro-Mechanical Systems
(MEMS) design and manufacturing various sensor technologies to include Gyro, Variable
Capacitance and silicone Pressure Transducers.
1.1 SIGNAL CONDITIONERS
To support the use of its sensors in large scale testing, ENDEVCO has developed several
generations of signal conditioner systems. Until recently, a state-of-the-art vibration laboratory
set up consisted of a rack of manually controlled signal conditioners. These signal conditioners
have manually controlled switches and knobs, to set full scale ranges, sensitivity and filter
corners and the set up information is recorded by hand.
1.2 COMPUTER CONTROLLED SIGNAL CONDITIONERS
To support the use of its sensors in large scale testing, and to eliminate the risk of incorrect
amplifier settings, ENDEVCO has developed several generations of computer controlled signal
conditioning systems. The first generation was the Multi-channel Amplifier Control system
(MAC). The second generation was the Computer Controlled Amplifier Systems (CCAS). The
CCAS family consists of five different systems that use the same rack and digital interface
assemblies with different analog boards. These units receive their setup commands over an
IEEE-488 interface bus from a computer/controller so that tests can be pre-programmed. In
addition, these units provide comprehensive self-test and self-calibration capabilities, which
greatly improves the reliability of the test data. User feedback indicates these units pay for
themselves by shortening test cycles, preventing re-tests and eliminating over-testing.
ENDEVCO is pleased to announce the third generation of computer controlled signal
conditioners: the OASIS 2000 (Optimal Architecture Sensor Interface System). Utilizing Ethernet
or EIA232 bus control, SMART Transducer technology, and a wide variety of signal conditioning
modules, the OASIS 2000 will meet all the requirements of multi-channel testing.
1.3 OASIS 2000 Hardware
The OASIS 2000 allows for configuration of a flexible modular multi-channel measurement
system that can interface to multiple sensor types (charge, voltage, full, half, quarter bridge PR,
VC, Isotron, IEEE 1451.4 compatible Smart Isotron) by using any combination of the 400 family
of signal conditioner cards housed in a 16 slot, 19” rack (ENDEVCO part No. 4990A).
The OASIS 2000 system can be customized to meet most requirements and is adaptable to the
developing needs of the user.

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AmplifierChannelNo.
CableID
SensorSerialNumber
MeasurementPosition
Ethernet
RS-232
Charge
PE
Full
Bridge
PR
AC
DC
Half
Bridge
PR
Quarter
Bridge
PR
Acceleration
Velocity
Pressure
Force
Strain
Temperature
16 4XX Cards
Upto128 ChannelsperRack
Upto16 Racks
SystemConfiguration Information
MeasurementPosition
CableID
SensorSerialNo.
SensorSensitivity
AmplifierChannelNo.
Full ScaleInputRange
OutputScaling
Amplifier'sGain
e2000Software
SystemConfiguration Control
Upto48 Analog Outputs
Combinedin4connectors
Smart
Sensors
CustomizableReports
ElectronicorPaper
BarCodeLabels
MeasurementPosition
SensorSerialNo.
CableID
Isotron
Smart
Isotron
SensorDatabase
ElectronicFile
CreatedManually
orAutomaticallyby
EndevcoCalibration System
1.4 OASIS 2000 Software
The OASIS 2000 Configuration Editor software (SW2000 or SW400) was developed to configure
Model 400 series signal conditioners and amplifiers installed in a Model 4990A rack.
The SW2000 software is a full featured software package designed to simplify system
configuration and amplifier setup.
•Intuitive, simple to use, graphical interface provides both table view and matrix view windows
for quick configuration for up to 2048 channels.
•Ethernet (one or more 4990A racks) or serial (single 4990A rack) communications.
•Reads 1451.4 Transducer Electronic Data Sheet (TEDS) information from sensors with a
TEDS capability. Writes 1451.4 ‘User Data’ (up to 8 characters) to TEDS capable sensors.
•Automatic Sensor Calibration due warnings.
•Customizes easily to user defined row definitions allowing for consolidation of all relevant
information in a single file.
•Configuration table data imports easily into MS Excel spreadsheets.
•Convenient ‘Online’, ‘Offline’ modes to facilitate setup prior to hardware installation or to
configure different setups without affecting the hardware.
•GoTo and Find operations for quickly accessing specific table view data.
The SW400 software is a subset of the SW2000 software that provides a basic set of tools for
controlling the amplifiers. This version provides only the matrix view window and it’s
associated amplifier functions.

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2. DESCRIPTION
The Endevco Model 4990A is a 19 inch rack that houses up to 16 of the Endevco Model 400
series signal conditioning modules in any combination. Signal conditioning modules supported by
the Model 4990A are:
•3-channel PE/IsotronSignal Conditioner Model 433
•3-channel DC Differential Voltage Amplifier Model 436
•2-channel PE/IsotronHigh Performance Signal Conditioner Model 428
•8-Channel Smart Transducer/Isotron®Signal Conditioner Model 482
The Model 4990A provides power, input and output connections, and computer interface for the
signal conditioning modules. Any combination of the 400 family of signal conditioning cards may
be used. The address of each signal conditioning module is automatically determined by the
position of the module in the rack.
The Model 4990A has four 25-pin “D” connectors on the front panel for access to the signal
conditioner outputs. Each connector contains the outputs of 4 modules for a maximum of 12
outputs. The outputs of the 8-Channel Smart Transducer Signal Conditioner Model 482 are
accessible only on its front panel, or through the optional Model 36020 output breakout panel.
The connection of the 4990A-1rack to the controlling PC is a standard TCP/IP Ethernet Network
bus RJ-45 connector.
The connection of the 4990A-2rack to the controlling PC is a standard EIA-232 bus through a 9
pin “D” connector.
Both computer interface connectors, 9 pin “D” connector and RJ-45 connector, are available on
the Model 4990A-1 and Model 4990A-2.
The Model 4990A-1rack contains an Ethernet to EIA-232 bus converter (EDAS) that can be
accessed through the TCP/IP Ethernet Network bus. This allows for multiple rack applications
where up to sixteen (16) 4990A-1racks (total of up to 256 signal conditioning modules) can be
interconnected and controlled by a single computer. Each Model 4990A-1 rack contains an RJ-
45 Ethernet connector and is assigned a unique IP address. The address of each individual card
is automatically determined by the rack address and the position of the card in the rack.
SW2000 configuration editor software and SW400 matrix view software is available to control the
Model 4990A rack and Model 400 series modules.
2.1 KEY FEATURES
•19 inch rack to support up to 16 Endevco Series 400 Signal conditioning modules in cabinet
installations or stand alone operation.
•Computer interface via TCP/IP Ethernet or serial EIA-232.
•Flexible design to accommodate any combination of the 400 family of signal conditioning
modules.
•Signal conditioner outputs easily accessible through four 25 pin “D” connectors.
•External Calibration input

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3. FUNCTIONAL CHARACTERISTICS
3.1 General
The Endevco Model 4990A-1 performs bi-directional communication with a computer through a
10 Mbps Ethernet bus. Each rack and module is assigned a unique address. The 4990A-2rack
communicates with the 400 family of signal conditioning cards through a half-duplex multi-drop
EIA-232 bus running at 9.6 or 19.2 kbps in a Master/Slave mode.
The Model 4990A only activates the communication bus as required by software polling or fault
reporting. This feature insures low noise operation.
3.2 Mechanical Characteristics
The Model 4990A consists of:
•CE certified 19” rack per IEC-297
•Power supply
•Power entry module with on/off switch
•Fuse
•Fan
•Computer interface port
•Module interconnect/power distribution PCB
•Four 25 pin “D” signal output connectors
•Calibration input BNC
•Card guides for installation of 16 signal conditioning cards
•Two 8 position DIP switches to set computer interface parameters.
The front side of the rack provides access to the front panels of the signal conditioning modules,
the signal output connectors, the computer interface port, and the calibration input BNC
connector. The rear side has the power entry module with on/off switch, fuse and fan.
The brackets for mounting the rack into a standard 19” cabinet and the handles are mounted on
the front side. The handles and brackets can be mounted on the rear side at the factory if
required.
The rack is designed to be used in 19” cabinets or stand-alone on the bench top. For bench top
applications the unit can be mounted in an optional Endevco Model EHM1616 powder-coated
shell. This option offers the following features:
•Light gray powder coat finish (RAL 7035).
•Tilt feet in the front, static feet in the rear.
•Integrated folding carrying handles on the sides.
3.3 Model 4990A-1: Ethernet Option
In the Model 4990A-1the EDAS monitors 32 discrete hardware lines that provide status on the
presence, absence and fault condition of each card, speeding up all control operations issued via
the Ethernet.

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3.4 Model 4990A-2: RS-232 Option
The Model 4990A-2uses the EIA-232 interface with a baud rate of 9.6 or 19.2 kbps to
communicate with the controlling PC. The communication function in the rack is simply an
extension of the EIA-232 connection between the controlling PC and the rack.
Card faults are detected in the Model 4990A-2by polling the addresses corresponding to each
slot.

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4. INSTALLATION AND COMMUNICATION
To help you get started using your OASIS 2000 with the fewest manuals in front of you as
possible, we’ve put all the basic information needed in this section. Once the system is
unpacked, setup, and running, refer to the following instruction manuals for detailed information
and specifications:
IMSW2000 Instruction Manual for the OASIS configuration software
IM428 Instruction Manual for the two channel PE/ISOTRON amplifier
IM433 Instruction Manual for the three channel PE/ISOTRON amplifier
IM436 Instruction Manual for the three channel DC amplifier
IM482 Instruction Manual for the eight channel SMART MODAL/ISOTRON amplifier
You will only receive the Instruction Manuals for the units you purchased. If you do not have
these documents contact Endevco before proceeding
4.1 Unpacking
CAUTION
OBSERVE SOUND ESD PRACTICES WHEN HANDLING THE SIGNAL
CONDITIONING MODULES TO PREVENT DAMAGE.
The Endevco Model 4990A rack is shipped with its instruction manual, accessories and power
cord in one package. The Model 400 series signal conditioning modules are shipped together
with their instruction manual and accessories, and the OASIS 2000 software is shipped
individually with its instruction manual. Carefully unpack and check all items for shipping
damage. Report any damage to the carrier immediately. If the shipping container or cushioning
material is damaged, it should be kept until the contents of the shipment have been checked
mechanically and electrically. Save the original packing materials for future shipments of the
hardware. Check each item of the shipment against the packing list. Verify that all ordered
optional accessories are included. Notify Endevco of any discrepancy.
4.2 Installation
Set the Model 4990A on a level, firmly supported surface. The weight of an empty 4990A is
approximately 24 pounds (35 pounds with the optional powder coated shell assembly). Add 12
ounces (340 grams) per amplifier card.
Insure sufficient clearance of the top and rear of the rack for proper operation of the ventilation
system. Insure the fan and chassis vents are not blocked. The internal temperature should not
exceed 28° C. Observe the environmental limitations of temperature and humidity when
installing the rack.
•Operating Temperature: 32° F to 122° F (0° C to 28° C)
•Storage Temperature: -40° F to 185° F (-40° C to 85° C)
•Operating Humidity: 0 % to 90 % non condensing
With no cards installed, look inside the 4990A rack from the front. On the backplane, above and
to the right of card slot 16 you will see two 8 position DIP switches. Verify the DIP switches are
set for the type of Model 4990A you have. Refer to the model number label on the rear of the

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unit and the default switch settings shown in paragraphs 4.3 and 4.4. You either have a Model
4990A-1 (Ethernet and RS232 control) or a Model 4990A-2 (RS232 control only).
Once the DIP switches are set to the appropriate position, install the Model 400 series signal
conditioning modules into the front side of the 4990A. Carefully align the modules with the card
guides, push the modules into the rack and secure them with the attached mounting screws.
Install the narrow blank panel to the right of slot 16. If your rack has less than 16 cards, install
the optional blank panels. Check that all modules and blank panels are secure in the rack.
J1J2J3J4J5J6J7J8J9J10 J11 J12 J13 J14 J15 J16
S1
S2
DIP Switches S1 and S2

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S1
S2
ON
S1
S2
ON
4990-1 4990-2
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8

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4.3 Default Jumper Settings for Ethernet Rack (4990A-1):
POS S1
SWITCH
SETTING
REMARK S2
SWITCH
SETTING
REMARK
1OFF(ON for snoop mode) OFF
2ON EDAS RX ßàback plane RX OFF
3OFF OFF (ON for snoop mode)
4OFF (ON for snoop mode) OFF (ON for snoop mode)
5ON EDAS TX ßàback plane TX X
6OFF X
7XX
8XOFF baud rate = 19.2 kbd
4.4 Default Jumper Settings for RS-232 Rack (4990A-2):
POS S1
SWITCH
SETTING
REMARK S2
SWITCH
SETTING
REMARK
1ON front panel RX ßà
back plane RX OFF (use POS1 ON for reversed cable, TX <--> RX)
2OFF OFF (use POS2 ON for reversed
cable, RX <--> TX)
3OFF ON straight cable (TX ßàTX)
4ON front panel TX ßà
back plane TX ON straight cable (RX ßàRX)
5OFF X
6OFF X
7XX
8XON baud rate = 9.6 kbd (OFF for
19.2kbd)

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5. POWERING UP OF THE RACK ASSEMBLY AND ESTABLISHING COMMUNICATION
CAUTION:
PRIOR TO INSERTING THE POWER CORD INTO THE POWER ENTRY MODULE, VERIFY
THE FOLLOWING:
5.1 Apply Power
Power source is between 90 and 264 VAC, 47 to 440 Hz.
Check that the installed fuse is the same rating as labeled on the rack next to the power entry
module. The fuse is located in the power entry module, on the outside of the rear panel
Check that the common connection (third wire) of the power source is connected to earth ground.
5.2 Computer Interface
Connect the Ethernet interface cable between the RJ45 connector on the 4990A-1 and network
hub or repeater connection. If you connect the host computer’s 10BASE-T network interface
card (NIC) directly to the 4990A-1 you must use a crossover cable. A crossover cable is a
twisted pair patch cable wired in such a way as to route the transmit signals from one piece of
equipment to the receive signals of another piece of equipment, and vice versa. The maximum
length of cable is 100 meters. If you plan on building your own cables see Appendix A
OR
Connect the RS-232 interface cable between the 9 pin “D” connector on the 4990A-1 or 4990A-2
and one of the host computer’s COM ports. The maximum length of cable is 15.2 meters. The
cable is a standard serial interface cable, straight pinning.
Power up the Model 4990A by activating the switch on the power entry module. Verify the fan is
operating.
5.3 Installing the OASIS SW2000 Software. (Windows 95/98)
Insert the OASIS CD in the CD drive and run the SETUP.EXE program. If your CD’s autorun
capability is active the setup program will run automatically.
All files will be installed into C:\”default directory” usually:
C:\Program Files\Endevco\OASIS (for SW2000 software)
C:\Program Files\Endevco\OASIS (for SW400 software)
An OASIS Program Item will be created.
To run OASIS, click on the Windows “Start” button then Programs>>Endevco>>OASIS

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5.4 Establishing Communication
The OASIS Configuration Editor screen is the main application screen. When the program is run,
this screen is displayed and the mode is defaulted to OFFLINE, as evidenced by the red
HARDWARE OFFLINE indicator visible below the ENDEVCO text
This spreadsheet-like table allows a user to quickly setup channels for an entire system of 400
series units.

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Click on the red HARDWARE OFFLINE indicator to establish communication between the computer and
hardware. The indicator should turn white and read HARDWARE ONLINE. This screen will immediately
appear:
Make your selection and click OK.

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The OASIS software can communicate with Model 400 units in a 4990A rack either serially or
through an Ethernet connection. The Options dialog box is provided to set the appropriate
communication parameters for an installation. To access the Options dialog box click on the Edit
drop down menu and select Options. The following screen will appear:

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5.4.1 RS-232 Serial Communication Control
If RS-232 communications is selected then the following parameters must be specified:
•Comm Port -Select the Comm port that is connected to the 4990A Rack.
•Baud Rate -Select the baud rate that matches the setting of the 4990A Rack. The 4990A
Rack is limited to 9600 or 19200. The options available in this pull down menu will be
determined by the Unit Type setting.
•Unit Type -Select which type of units are in the configuration. This setting not only
determines the appropriate options for the baud rate selection but also informs OASIS of the
unit types when it is in OFFLINE mode so it can provide the appropriate indications where
unit type is displayed.
5.4.2 Ethernet Communication Control
When Ethernet is selected as the communication type, the Ethernet communication controls
become active.
•Ethernet Addresses Table -This tables purpose is to assign a rack number to each physical
rack in the system. Since the Oasis controller software uses rack and slot number locations
to identify amplifier cards in the system, each physical rack needs to be assigned a different
rack number from 1 to 16.
Every device on an Ethernet network must have a unique set of Ethernet addresses. Therefore,
a rack’s set of Ethernet addresses is used to identify which physical rack is assigned to which
rack number in the table.
Below are the steps to assign and store Ethernet addresses for a rack:
1. Select a rack (row) in the table.
2. Enter in the table the desired Ethernet addresses for the selected rack.
3. Click on the “Write Rack” button and follow the displayed instructions for setting up
the selected rack to receive and store Ethernet addresses.
4. Click on the “Test Rack” button and follow the displayed instructions for setting up
the selected rack to verify Ethernet communication.
•Active Racks Checkboxes -These checkboxes to the left of the Ethernet Addresses Table,
allow a user to make a rack active/inactive (start/stop communication with it) without having
to re-enter/delete its Ethernet address data in the table.
•Read Rack Button -Reads the Ethernet addresses from the actual rack which is setup and
connected for Ethernet addressing into the selected rack in the table. (Instructions are
displayed for setting up and connecting the rack for Ethernet addressing.)
•Write Rack Button -Writes the selected rack’s Ethernet addresses in the table to the actual
rack which is setup and connected for Ethernet addressing. (Instructions are displayed for
setting up and connecting the rack for Ethernet addressing.)
•Test Rack Button -Verifies Ethernet communication with the selected rack in the table.
(Instructions are displayed for setting up and connecting the rack for Ethernet
communication.)
•Move Up Button -This is a table editing aid which moves the table's selected Ethernet
addresses up one row. (It exchanges the selected row's Ethernet addresses with the row
above it.)

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•Move Down Button -This is a table editing aid which moves the table's selected Ethernet
addresses down one row. (It exchanges the selected row's Ethernet addresses with the row
below it.)
•All Inactive Button -Unchecks all the active racks checkboxes.
•All Active Button -Checks all the active racks checkboxes.
5.4.3 Ethernet Addressing Guidelines
The host computer must have a 10BASE-T Ethernet Network Interface Card installed and you
must know the IP address, subnet mask, and installed gateway of the host computer.
All devices on a given network must have the same Subnet Mask.
Each device on a network must have the same Network ID portion of the IP address. (The
numbers in the IP Address corresponding to the 255s in the Subnet Mask)
Each device on a network must have a different Host ID portion of the IP address. (The numbers
in the IP Address corresponding to the 0s in the Subnet Mask)
All devices on a given network must have the same/valid Gateway Address if they are
communicating across networks.
Configuring the Model 4990A Rack
After entering the IP address, subnet mask and gateway address for all active racks, this
information must be written to the 4990A racks. Prior to writing data to the 4990A, the DIP
switches on the backplane, above and to the right of card slot 16 must be set to the positions in
the following table:
POS S1
SWITCH
SETTING
REMARK S2
SWITCH
SETTING
REMARK
1 OFF OFF
2 OFF OFF
3 ON EDAS RX ßàfront panel RX ON EDAS TX ßàfront
panel TX
4 OFF ON EDAS RX ßàfront
panel RX
5 OFF X
6 ON EDAS TX ßàfront panel TX X
7 XX
8 XXbaud rate = 9.6 or
19.2 kbd

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On the Options screen click on Write Rack. The following window will appear:
Follow the instructions and click OK. A write failure will produce the following window:
Correct the problem and click OK.
If you suspect the Ethernet NIC, cable, or hub may be the cause of the failure:
Identify a vacant serial (COM) port on the host computer
Connect a serial (RS-232) cable between this port and the 9 pin “D” connector on the 4990A.
Set the DIP switches for serial communication per paragraph 3.3
If the 4990A responds, check the hardware (NIC, cable, hub) and check for a correct IP address,
subnet mask and gateway address.

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Once you have the correct IP address, subnet mask and gateway address displayed in the
Options window, set the DIP switches as follows:
POS S1
SWITCH
SETTING
REMARK S2
SWITCH
SETTING
REMARK
1OFF (ON for snoop mode) OFF
2ON EDAS RX ßàback plane RX OFF
3OFF OFF (ON for snoop mode)
4OFF (ON for snoop mode) OFF (ON for snoop mode)
5ON EDAS TX ßàback plane TX X
6OFF X
7XX
8XOFF baud rate = 19.2 kbd
On the Options screen click on Test Rack. The following window will appear:
Follow the instructions and click OK. The following window will be displayed while the computer
is establishing communications with the rack:

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If communication with the rack fails, the following window will be displayed:
Correct the errors and click OK.
If you suspect the Ethernet NIC, cable, or hub may be the cause of the failure:
Identify a vacant serial (COM) port on the host computer
Connect a serial (RS-232) cable between this port and the 9 pin “D” connector on the 4990A.
Set the DIP switches for serial communication per paragraph 4.3
If the 4990A responds, check the hardware (NIC, cable, hub) and check for a correct IP address,
subnet mask and gateway address.