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User’s Guide
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USB-4750
32 Channel Isolated Digital I/O
USB Data Acquisition Module
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® OMEGAnet Online Service Internet e-mail omega.com info@omega.com Servicing North America: U.S.A.: One Omega Drive, Box 4047 ISO 9001 Certified Stamford, CT 06907-0047 Tel: (203) 359-1660 FAX: (203) 359-7700 e-mail: info@omega.com Canada: 976 Bergar Laval (Quebec) H7L 5A1, Canada Tel: (514) 856-6928 FAX: (514) 856-6886 e-mail: info@omega.ca For immediate technical or application assistance: ® U.S.A. and Canada: Sales Service: 1-800-826-6342/1-800-TC-OMEGA ® Customer Service: 1-800-622-2378/1-80
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USB-4750 32-Channel Isolated Digital I/O USB Data Acquisition Module User Manual
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Contents Chapter 1 Introduction ..................................................... 2 1.1 Hardware Features............................................................. 2 1.2 Software Overview............................................................ 3 1.2.1 More on the CD ............................................................. 3 Chapter 2 Installation ....................................................... 6 2.1 Unpacking ....................................................
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USB-4750 User Manual vi
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1 2 Introduction Sections include: • Hardware Features • Software Overview
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Chapter 1 Introduction Thank you for buying the USB-4750 data acquisition mod- ule. The USB-4750 is a powerful data acquisition (DAS) module for the USB port. It features a unique circuit design and complete functions for data acquisition and control. 1.1 Hardware Features USB-4750 features excellent measurement & control functions: • 32 isolated digital input/output channels • High-voltage isolation up to 2,500 VDC on all channels • Dry/wet contact support • Inte
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1.2 Software Overview Omega offers a rich set of DLL drivers, third-party driver support and application software on the companion CD-ROM to help fully exploit the functions of your device. The Device Drivers feature a complete I/O function library to help boost your application performance and work seamlessly with development tools such as Visual C++, Visual Basic, 1.2.1 More on the CD For instructions on how to begin programming in each development tool, some tutorial chapters
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USB-4750 User Manual 4
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2 2 Installation Sections include: • Unpacking • Driver Installation • Hardware Installation • Hardware Uninstallation
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Chapter 2 Installation 2.1 Unpacking After receiving your USB-4750 package, please inspect its contents first. The package should contain the following items: • USB-4750 Module • Shielded USB 2.0 Cable (1.8 m) • Companion CD-ROM (DLL driver included) The USB-4750 Module harbors certain electronic components vulnerable to electrostatic discharge (ESD). ESD could easily damage the integrated circuits and certain components if preventive measures are not carefully pai
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2.2 Driver Installation We recommend you install the software driver before you install the USB-4750 module into your system, since this will guarantee a smooth installation process. The 32-bit DLL driver Setup program for the USB-4750 module is included on the companion CD-ROM that is shipped with your module package. Please follow the steps on the following page to install the driver software: 7 Chapter
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For further information on driver-related issues, an online version of the Device Drivers Manual is available by accessing the following path: Start/Programs/Omega USB-4700 Series/ Device Driver’s Manual USB-4750 User Manual 8
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2.3 Hardware Installation Note: Make sure you have installed the software driver before you install the module (please refer to Sec- tion 2.2 Driver Installation) After the DLL driver installation is completed, you can now go on to install the USB-4750 module in any USB port that supports the USB 1.1/2.0 standard, on your computer. It is suggested that you refer to the computer’s user manual if you have any doubts. Please follow the steps below to install the module on your sy
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Step2: Right click the “Unplug or Eject Hardware” icon on your task bar. Figure 2.1: Unplug or Eject Hardware Dialog Step3: Select “USB-4750 Device” and press “Stop” Button. Figure 2.2: Stop a Hardware device dialog box Step4: Unplug your USB device from the USB port. Note: Please make sure that you have closed the application before unplugging the USB device, otherwise unexpected system error or damage may occur. USB-4750 User Manual 10
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3 2 Signal Connections Sections include: • Overview • Isolated Digital I/O Connections • Field Wiring Considerations
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Chapter 3 Signal Connections 3.1 Overview Maintaining good signal connections is one of the most important factors in ensuring that your application system is sending and receiving data correctly. A good signal connection can avoid unnecessary and costly damage to your PC and other hardware devices. 3.2 I/O Connectors USB-4750 is equipped with plug-in screw-terminal connectors that facili- tate connection to the module without terminal boards or cables. 3.2.1 Pin Assignment
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3.2.2 I/O Connector Signal Description Table 3.1: I/O Connector Signal Descriptions Signal Reference Direction Description IDI<0~15> GND Input Isolated digital input channels INT<0,1> INT_G Input Interrupt trigger sources. INT<0,1>_ - - Ground for interrupt pins. G CNT<0,1> GND Input Isolated input counters IDO<0~15> GND Output Isolated digital output channels COM<0,1> - - Common pins for connecting induc- tive loads of isolated output channels GND - - Ground
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3.3 Isolated Digital I/O Connections 3.3.1 Dry/Wet Contact Support for Digital Input Each digital input channel accepts either dry contact or 0 ~ 5 VDC wet contact inputs. Dry contact capability allows the channel to respond to changes in external circuitry (e.g., the closing of a switch in the external circuitry) when no voltage is present in the external circuit. Figure 3-1 shows external circuitry with both wet and dry contact components, con- nected as an input source to one of t
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3.3.2 Isolated Digital Output Connections Each of 8 isolated digital output channels comes equipped with a Darling- ton transistor. Every 8 output channels share common collectors and inte- gral suppression diodes for inductive loads. Channels 0 ~ 7 use COM0, and channels 8 ~ 15 use COM1 as a common pin. If an external voltage (5 ~ 40 V) is applied to an isolated output channel (IDO 0 ~ IDO 15) while it is being used as an output channel, the current will flow from the external voltage so
