User’s Guide Shop online at www.omega.com e-mail: info@omega.
OMEGAnet ® Online Service www.omega.com Internet e-mail info@omega.com Servicing North America: USA: ISO 9001 Certified Canada: One Omega Drive, P.O. Box 4047 Stamford CT 06907-0047 TEL: (203) 359-1660 e-mail: info@omega.com 976 Bergar Laval (Quebec) H7L 5A1, Canada TEL: (514) 856-6928 e-mail: info@omega.
Contents INTRODUCTION..........................................................................1 OVERVIEW................................................................................................ 1 W HAT ’S INCLUDED ................................................................................ 1 INSTALLATION ..........................................................................2 OPERATING SYSTEM INSTALLATION ................................................. 2 SYSTEM INSTALLATION................
Figures: Figure 1- RS-530/422 4 Wire 485 (Default)....................................................7 Figure 2 - RS-485, 2 Wire with Echo.................................................................7 Figure 3 - RS-485, 2 Wire No Echo....................................................................7 Figure 4 - Asynchronous Communications Bit Diagram.............................
Introduction Introduction Overview The OMG-USB-485-1 equips the PC with 1 USB to RS-530/422/485 Asynchronous serial port providing a versatile interface for common RS530/422/485 needs. The advantage of this product over more traditional approaches is that it doesn’t require opening the computer case, nor does it require resources such as I/O ports or IRQ’s. It does require a system that supports USB both in terms of hardware and operating system.
Installation Installation Operating System Installation Choose Install Software at the beginning of the CD and select the Serial I/O software drivers and install SeaCOM. System Installation The screen captures below are taken from a Windows 98 installation. Your particular operating system may differ slightly from what is shown based on your version of windows. The OMG-USB-485-1: can be connected to any Upstream Type “A” port either at the PC host or an Upstream Hub.
Installation Since you have already installed the software by running “Setup”, simply click “Next” to proceed. The drivers that were installed during setup will automatically be used to configure the adapter for use.
Installation Windows has now located a driver and installed the software. After the driver has been located click “Finish. You should see one more “New Hardware Found”, indicating the actual port being created. If you view your systems Device Manager at this point, you should have a new “COM” port in the Port(COM & LPT) Device Class. It should look similar to the screen shot on the following page.
Installation You can access your new COM: port by using the assigned COM: identifier shown above. In this case, it is COM5: but this assignment will vary from system to system. At this point, the hardware is recognized. To verify operation use the supplied WinSSD diagnostic utility. WinSSD can be found in the Start, Programs group.
Configuration Configuration Electrical Interface Selection The port on the OMG-USB-485-1 has the ability to be used as RS-530/422/485, RS-422 or 2 wire RS-485. This is selectable via the DIP-switch SW1. The chart below describes each of the switch position’s function. Please refer to the following page for switch setting examples. Switch SW1 ON enables, adds and connects. SW1 position OFF disables, removes and disconnects.
Configuration Switch Examples Please use the following examples to configure your adapter.
Technical Description Technical Description The OMG-USB-485-1: utilizes a USB UART. This chip features programmable baud rate, data format, 128 byte Dual Port TX Buffer, and 384 byte Dual Port RX Buffer. The RS-530/422/485 transceiver supports data rates up to 921.6K baud.. Features • Hot-Pluggable device that doesn’t require opening the case • No system resources are required (i.e.
Specifications Specifications Environmental Specifications Specification Temperature Range Humidity Range Operating 0º to 50º C (32º to 122º F) 10 to 90% R.H. Non-Condensing Storage -20º to 70º C (-4º to 158º F) 10 to 90% R.H. Non-Condensing Manufacturing • All Printed Circuit boards are built to UL 94V0 rating and are 100% electrically tested. These printed circuit boards are solder mask over bare copper or solder mask over tin nickel.
Appendix A – Troubleshooting Appendix A - Troubleshooting Serial Utility test software is supplied with the adapter and will be used in the troubleshooting procedures. Using this software and following these simple steps, most common problems can be eliminated without the need to call Technical Support. 1. If your adapter isn’t working, first check to make sure that USB support is enabled in the System BIOS and it is functioning properly in the operating system.
Appendix B – How To Get Assistance Appendix B - How To Get Assistance 1. Read this manual thoroughly before attempting to install the adapter in your system. 2. When calling for technical assistance, please have your user manual and current adapter settings. If possible, please have the adapter connected in a computer ready to run diagnostics. 3. Visit Omega’s website at www.omega.com for the latest software updates and newest manuals. 4.
Appendix C - Electrical Interface Appendix C - Electrical Interface RS-530 RS-530 (a.k.a. EIA-530) compatibility means that RS-422 signal levels are met, and the pin-out for the DB-25 connector is specified. The EIA (Electronic Industry Association) created the RS-530 specification to detail the pin-out, and define a full set of modem control signals that can be used for regulating flow control and line status.
Appendix C - Electrical Interface RS-485 RS-485 is backwardly compatible with RS-422; however, it is optimized for partyline or multi-drop applications. The output of the RS-422/485 driver is capable of being Active (enabled) or Tri-State (disabled). This capability allows multiple ports to be connected in a multi-drop bus and selectively polled. RS-485 allows cable lengths up to 4000 feet and data rates up to 10 Megabits per second. The signal levels for RS-485 are the same as those defined by RS-422.
Appendix D - Asynchronous Communications Appendix D - Asynchronous Communications Serial data communications implies that individual bits of a character are transmitted consecutively to a receiver that assembles the bits back into a character. Data rate, error checking, handshaking, and character framing (start/stop bits) are pre-defined and must correspond at both the transmitting and receiving ends.
Appendix E - Compliance Notices Appendix E - Compliance Notices Federal Communications Commission Statement FCC - This equipment has been tested and found to comply with the limits for Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.
WARRANTY/DISCLAIMER OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product. If the unit malfunctions, it must be returned to the factory for evaluation.
Where Do I Find Everything I Need for Process Measurement and Control? OMEGA…Of Course! Shop online at www.omega.
