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Chapter 3

18

Connecting to a Self-Powered USB Hub

Self-powered USB hubs are USB hubs that are powered by their own
external power supply. Theoretically, you can connect up to five
self-powered USB hubs to a USB port on the host computer. Each of
these hubs supports up to four DT9820 Series function modules.

Note:

The practical number of DT9820 Series function modules that

you can connect to a single USB port depends on the throughput you
want to achieve.

The bandwidth of the USB bus is 12 Mbits/second. For each DT9820
Series module, the maximum throughput is 960 Hz and each buffer
is four bytes wide. Therefore, if you want to achieve full throughput
on each function module, you should connect no more than four
DT9820 Series function modules to a single USB port.

To connect a DT9820 Series function module to a self-powered USB
hub, perform the following steps:

1.

Attach one end of the EP310 cable to the DT9820 Series module
and the other end of the EP310 cable to a self-powered USB hub.

2.

Connect the power supply for the self-powered USB hub to an
external power supply.

3.

Connect the hub to the USB port on the host computer using
another EP310 cable.
The operating system automatically detects the USB device.

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Содержание DT9820 Series

Страница 1: ...DT9820 Series UM 18219 B Getting Started Manual...

Страница 2: ...ements of patents or other rights of third parties which may result from its use No license is granted by implication or otherwise under any patent rights of Data Translation Inc Use duplication or di...

Страница 3: ...Hardware Features 2 DT9820 Series Software 3 Getting Started Procedure 4 Chapter 2 Preparing to Use a Function Module 5 Unpacking 7 Checking the System Requirements 8 Installing the Software 9 Viewin...

Страница 4: ...Signals 46 Connecting Digital Output Signals 47 Chapter 7 Verifying the Operation of a Function Module 49 Installing the Quick Data Acq Application 52 Running the Quick Data Acq Application 54 Perform...

Страница 5: ...Windows Me Millennium Edition Windows 2000 or Windows XP operating system How this Manual is Organized This manual is organized as follows Chapter 1 Overview describes the key features of the DT9820...

Страница 6: ...owing conventions are used in this manual Notes provide useful information that requires special emphasis cautions provide information to help you avoid losing data or damaging your equipment and warn...

Страница 7: ...TM in Windows 98 Windows Me Windows 2000 or Windows XP to access the capabilities of Data Translation data acquisition devices This manual is included on the Data Acquisition OMNI CD DTx EZ Getting St...

Страница 8: ...artment is available to provide technical assistance Refer to the DT9820 Series User s Manual for information on how to contact the Technical Support Department refer to page 11 for information on vie...

Страница 9: ...1 1 Overview DT9820 Series Key Hardware Features 2 DT9820 Series Software 3 Getting Started Procedure 4...

Страница 10: ...of Analog Inputs Analog Input Sample Rate of Analog Outputs of Digital I O Lines 60 Hz 50 Hz DT9821 4 with 24 bit resolution1 1 The channels are configured as differential 960 Hz 800 Hz 0 8 input2 8...

Страница 11: ...tomatically calibrated when the module is powered up The Quick Data Acq application Provides a quick way to get a DT9820 Series function module up and running Using the Quick Data Acq application you...

Страница 12: ...getting started procedure Figure 1 Getting Started Flow Diagram Install the Function Module see Chapter 3 starting on page 13 Wire Signals see Chapter 6 starting on page 35 Verify the Operation of th...

Страница 13: ...5 2 Preparing to Use a Function Module Unpacking 7 Checking the System Requirements 8 Installing the Software 9 Viewing the DT9820 Series Documentation Online 11...

Страница 14: ...apter 6 starting on page 35 Verify the Operation of the Function Module see Chapter 7 starting on page 49 Configure the Device Driver see Chapter 4 starting on page 21 Prepare to Use a Function Module...

Страница 15: ...contact Data Translation If you are in the United States call the Customer Service Department at 508 481 3700 An application engineer will guide you through the appropriate steps for replacing missing...

Страница 16: ...em meets the system requirements install the software as described in the next section Table 2 Minimum System Requirements Feature Minimum Requirements Operating System Windows 98 Windows Me Windows 2...

Страница 17: ...can install appears 6 Click Device Drivers The DT Open Layers Data Acquisition software wizard appears 7 Click Next You are prompted for the destination location 8 Either change the directory path and...

Страница 18: ...program folder name 10 Either change the program folder name or accept the default program folder name then click Next The files are copied to the destination directory 11 Click Finish The DT Data Ac...

Страница 19: ...the table of contents on the left side of the document Within the document click the text shown in blue to jump to the appropriate reference the pointer changes from a hand to an index finger To go b...

Страница 20: ...Chapter 2 12...

Страница 21: ...13 3 Installing a Function Module Connecting Directly to the Host Computer 16 Connecting to a Self Powered USB Hub 18...

Страница 22: ...page 35 Verify the Operation of the Function Module see Chapter 7 starting on page 49 Configure the Device Driver see Chapter 4 starting on page 21 Prepare to Use a Function Module see Chapter 2 start...

Страница 23: ...sufficient for your application Connect to one or more self powered USB hubs described on page 18 Use this method if your application requires more than two DT9820 Series function modules connected t...

Страница 24: ...Figure 2 The operating system automatically detects the USB device Figure 2 Attaching the DT9820 Series Function Module Directly to the Host Computer 3 If you previously installed the DT9820 Series De...

Страница 25: ...Click Finish A New Hardware Found dialog box appears indicating that Windows is installing the driver for the USB device 8 Repeat the steps 1 to 2 to attach another DT9820 Series function module to th...

Страница 26: ...each DT9820 Series module the maximum throughput is 960 Hz and each buffer is four bytes wide Therefore if you want to achieve full throughput on each function module you should connect no more than...

Страница 27: ...0 Series Device Driver 5 Click the option to search for the driver then click Next 6 Click the option to specify the location then enter x Products Core DT9820 as the path from which to copy files whe...

Страница 28: ...without causing damage This process is called hot swapping Your application may take a few seconds to recognize a module once it is plugged back in EP310 Cable Self Powered USB Hubs Host Computer DT98...

Страница 29: ...21 4 Configuring the Device Driver...

Страница 30: ...hapter 6 starting on page 35 Verify the Operation of the Function Module see Chapter 7 starting on page 49 Configure the Device Driver this chapter Prepare to Use a Function Module see Chapter 2 start...

Страница 31: ...termination resistance is used for the analog input channels This is the default configuration Bias return termination resistance is particularly useful when your differential source is floating 5 Sel...

Страница 32: ...This name is used to identify the module in all subsequent applications 10 When you are finished configuring the function module click Close 11 Repeat steps 3 to 10 for the other function modules that...

Страница 33: ...25 5 Configuring and Attaching the Screw Terminal Panel Configuring the STP9820 28 Attaching the STP9820 32...

Страница 34: ...hapter 6 starting on page 35 Verify the Operation of the Function Module see Chapter 7 starting on page 49 Configure the Device Driver see Chapter 4 starting on page 21 Prepare to Use a Function Modul...

Страница 35: ...e STP9820 screw terminal panel then attach the STP9820 to the DT9820 Series module Refer to Figure 4 for an illustration of the STP9820 Figure 4 STP9820 Screw Terminal Panel J1 R2 R4 R7 R9 R12 R14 R17...

Страница 36: ...ules use dual RC low pass input filters for each analog input channel with a cutoff frequency of 100 Hz Through software you can turn these input filters on or off they are off by default If the filte...

Страница 37: ...equency also decreases the noise rejection Table 3 lists the approximate resistor values to use for certain input filter cutoff frequencies Table 4 lists the locations from which to remove and add res...

Страница 38: ...h TTL digital output lines allows the digital output lines of the DT9820 Series board to drive most commercially available 5 V relays with up to 100 mA of current and 5 V of user supplied power Table...

Страница 39: ...l a relay driver perform the following steps 1 Remove resistors from locations R22 to R29 2 Solder the relay driver in location U1 on the STP9820 while observing the correct polarity Continue with the...

Страница 40: ...le from Data Translation Figure 5 illustrates these connection methods Figure 5 Attaching the STP9820 Screw Terminal Panel to a DT9820 Series Function Module Table 5 on page 33 lists the pin assignmen...

Страница 41: ...ine 0 10 5 V Isolated Input Outputa 11 Isolated Digital Ground 12 Isolated Analog Common 13 Analog Input Subsystem 03 14 Isolated Analog Common 15 Analog Input Subsystem 02 16 2 5 V Reference 17 Analo...

Страница 42: ...ates power to the module You can externally power the 5 V isolated output signal This allows you to retain the last value that was written to the digital output lines when the DT9820 Series module is...

Страница 43: ...35 6 Wiring Signals Preparing to Wire Signals 37 Connecting Analog Input Signals 41 Connecting Analog Output Signals 45 Connecting Digital Input Signals 46 Connecting Digital Output Signals 47...

Страница 44: ...chapter Verify the Operation of the Function Module see Chapter 7 starting on page 49 Configure the Device Driver see Chapter 4 starting on page 21 Prepare to Use a Function Module see Chapter 2 start...

Страница 45: ...ctric motors power lines solenoids and electric arcs unless the signals are enclosed in a mumetal shield Prevent electrostatic discharge to the I O while the DT9820 Series function modules are operati...

Страница 46: ...Note Connector J1 is tied to the host computer s chassis ground Table 6 lists the assignments of the screw terminals on the STP9820 screw terminal panel Table 6 Screw Terminal Assignments of the STP98...

Страница 47: ...alog Ground 3 DAC0 Analog Output 0 4 DAC1 Analog Output 1 5 DGND Digital Ground 6 5VD 5 Va TB4 1 DOUT0 Digital Output 0 2 DOUT1 Digital Output 1 3 DOUT2 Digital Output 2 4 DOUT3 Digital Output 3 5 DOU...

Страница 48: ...ailable only when one of the subsystems is activated which in turn acti vates power to the module You can externally power the 5 V isolated output signal This will allow you to retain the last value t...

Страница 49: ...the differential channels by adding 10 k of termination resistance from the low side of the channel to isolated analog ground For more information on configuring termination resistance refer to Chapt...

Страница 50: ...Return Analog Ground Rs Analog In 0 Analog In 0 Return Analog Ground Rv Rs Bridge DC Supply A B STP9820 Screw Terminal Panel TB1 2 It is recommended that you software select 10 k of resistance to con...

Страница 51: ...make sure that the low side of the signal is connected to ground at the signal source not at the DT9820 Series function module and do not tie the two grounds together Figure 7 Connecting Differential...

Страница 52: ...log Input 0 Return Analog Ground 4 to 20 mA VCC User installed resistor The user installed resistor connects the high side of the channel to the low side of the corresponding channel thereby acting as...

Страница 53: ...Signals Figure 9 shows how to connect an analog output voltage signal channel 0 in this case to a DT9822 function module Figure 9 Connecting Analog OutputVoltages Shown for Channel 0 Analog Output 0...

Страница 54: ...connect digital input signals lines 0 and 1 in this case to a DT9820 Series function module Figure 10 Connecting Digital Inputs Shown for Lines 0 and 1 TB5 1 TB5 2 Digital Input Line 0 Digital Input...

Страница 55: ...s needed to drive this relay In this scheme one side of the relay is connected to the Vcc power supply this connection allows the internal cache diodes to limit the voltage spikes from the relay coil...

Страница 56: ...6 48 Figure 12 Connecting a Relay Driver to the STP9820 ScrewTerminal Panel TB4 1 Digital Output Line 0 5 V Relay Coil STP9820 Screw Terminal Panel TB3 5 STP9820 Screw Terminal Panel TB3 6 5 V Digital...

Страница 57: ...49 7 Verifying the Operation of a Function Module Installing the Quick Data Acq Application 52 Running the Quick Data Acq Application 54...

Страница 58: ...hapter 6 starting on page 35 Verify the Operation of the Function Module this chapter Configure the Device Driver see Chapter 4 starting on page 21 Prepare to Use a Function Module see Chapter 2 start...

Страница 59: ...single analog input channel or digital input port Acquire data continuously from one or more analog input channels using an oscilloscope strip chart or Fast Fourier Transform FFT view Output data from...

Страница 60: ...roducts that you can install appears 6 Click Quick Data Acq The Quick Data Acq setup wizard appears 7 Click Next You are prompted for the destination location 8 Either change the directory path and or...

Страница 61: ...Verifying the Operation of a Function Module 53 7 7 7 7 7 7 7 7 7 12 Click Finish The DT Data Acquisition Software setup program reappears 13 Click Main Menu 14 Click Exit...

Страница 62: ...e 9 3 Select Quick Data Acq from the Data Translation Inc Quick Data Acq program group Note The Quick Data Acq application allows you to verify basic operations on the module however it may not suppor...

Страница 63: ...information on connecting differential analog input signals 2 Click the Acquisition menu 3 Click Single Analog Input 4 Select the appropriate DT9820 Series function module from the Board list box Not...

Страница 64: ...u 3 Click Single Analog Output 4 Select the appropriate DT9820 Series function module from the Board list box Note Once you select the function module the LED on the module turns green 5 In the Channe...

Страница 65: ...for more information on connecting differential analog input signals 2 Click the Acquisition menu 3 For this example click Scope 4 Select the appropriate DT9820 Series function module from the Board...

Страница 66: ...hanges to reflect the selected range for all the analog input channels on the module 10 In the Trigger box select Auto to acquire data continuously from the specified channels or Manual to acquire a b...

Страница 67: ...he DT9820 Series function module Refer to page 46 for more information on connecting digital inputs 2 Click the Acquisition menu 3 Click Digital Input 4 Select the appropriate DT9820 Series function m...

Страница 68: ...module from the Board list box Note Once you select the function module the LED on the module turns green 5 Select digital output port B by clicking Port B 6 Click the appropriate bits to select the...

Страница 69: ...61 A Using Your Own Screw Terminal Panel Analog Inputs 63 Analog Outputs 64 Digital Inputs 65 Digital Outputs 66...

Страница 70: ...de If you choose not to use the STP9820 screw terminal panel considerations must be given as to how the signals interact in the real world as well as how they interact with each other This appendix de...

Страница 71: ...to cross talk and thermal errors One problem to consider with differential inputs is the bias current error The differential impedance is usually hundreds of megaohms With a very small bias current mu...

Страница 72: ...e grounds of most boards are optimized for analog inputs at the expense of some logic or high frequency noise on the analog outputs This is because the analog and digital grounds of the board are conn...

Страница 73: ...5 A A A A A A A A A Digital Inputs TTL type inputs must have current limiting so that circuitry is not damaged when power is removed On all Data Translation USB modules current limiting is used to pre...

Страница 74: ...he digital ground provided in the connector next to the outputs If just eight of the digital outputs are switching 16 mA per output then 128 mA of current flows To minimize problems with ringing loadi...

Страница 75: ...ls analog outputs 45 differential analog inputs 41 digital inputs 46 digital outputs 47 relays 47 connecting to the host computer directly 16 using a self powered USB hub 18 connector J1 pin assignmen...

Страница 76: ...uick Data Acq 3 installing 52 running 54 R related documents vi relay drivers 30 relays 47 requirements 8 running the Quick Data Acq application 54 S screw terminal assignments 38 STP9820 screw termin...

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