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Omega Four Port RS-232/422/485 to USB Adaptor manual

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Table of contents for the manual

  • Page 1

    www .omega.com e-mail: info@omega.com U ser ’ s Guide OMG-USB-SER-4 Four Por t RS-232/422/485 to USB Adaptor Shop online at[...]

  • Page 2

    Servicing Nor th America: USA: One Omega Drive, P.O. 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: USA and Canada: Sale[...]

  • Page 3

    Contents I NTRODUCTION ..........................................................................1 O VERVIEW ................................................................................................ 1 W HAT ’ S I NCLUDED ................................................................................ 1 I NSTALLATION .......................[...]

  • Page 4

    A PPENDIX D - A SYNCHRONOUS C OMMUNICATIONS ...............14 A PPENDIX E - C OMPLIANCE N OTICES .....................................15 F EDERAL C OMMUNICATIONS C OMMISSION S TATEMENT ............ 15 C ANADIAN R ADIO I NTERFERENCE R EGULATIONS ......................... 15 EMC D IRE CTIVE S TATEMENT .................................................[...]

  • Page 5

    Introduction OMG - USB - SER - 4 Page 1 Introduction Overview The OMG - USB - SER - 4 equips the PC with 4 USB to RS - 232/422/485 Asynchronous serial ports providing a versa tile interface for common serial needs. The advantage of this product over more traditional approaches is that it does not require opening the computer case, nor does it requi[...]

  • Page 6

    Installation OMG - USB - SER - 4 Page 2 Installation Operating System Installation Choose Install Software at the beginning of the CD and install SeaCOM . System Installation The screen captures below are taken from a Windows 9 8 installation. Your particular operating system may differ slightly from what is shown based on your version of Windows. [...]

  • Page 7

    Installation OMG - USB - SER - 4 Page 3 You can access your new COM: ports by using the assigned COM: identifiers as shown above. In this case, it is COM3, 4, 5 and 6. However, this assignment will vary from system to system. At this point , the hardware is recognized and ready to use.[...]

  • Page 8

    Con figuration OMG - USB - SER - 4 Page 4 Configuration Original configuration This device ships with the following configuration. 422 mode, 120 ohm termination, 1K ohm pull up on RX+ 1K ohm pull down on RX - In order to change this configurat ion the box must be opened. Do this by removing the four screws located on the bottom. When reassembling p[...]

  • Page 9

    Con figuration OMG - USB - SER - 4 Page 5 Switch Descriptions Figure 1 : Switches SW2 and SW4 L 485 option, OFF for 422. OFF: No effect ON : Connects TX+ to RX+ for two - wire operation L 485 option, OFF for 422. OFF: No effect ON : Connects TX - to RX - for two - wire operation PU 485 option, OFF for 422. OFF: No effect ON : Adds a 1 K ohm pull - [...]

  • Page 10

    Con figuration OMG - USB - SER - 4 Page 6 Switch Examples Figure 2 : RS422/485 Interface Configuration 485 Mode Selection OFF : 422 Mode The transmitter lines TX+ and TX - are always driven ON : 485 Mode The transmitter lines TX+ and TX - are switched to high impedance when the device is n ot actively transmitting data NE 485 option, OFF for 422 OF[...]

  • Page 11

    Con figuration OMG - USB - SER - 4 Page 7 Switch Examples Continue d Port 4 Port 3 Port 2 Port 1 Figure 3 : Electrical Interface Configuration Port 1 : RS - 232 The corresponding shunt is in the 232 position. Th e switches will have no effect. Port 2 : RS - 485 two wire communication with no echo. The corresponding shunt is in the 422/485 position.[...]

  • Page 12

    Technical OMG - USB - SER - 4 Page 8 Technical Description The OMG - USB - SER - 4 utilizes four USB UARTs. These chips feature programmable baud rate, data format, 12 8 byte Dual Port TX Buffer, and 384 byte Dual Port RX Buffer. The RS - 232/422/485 transceiver supports data rates up to 921.6K baud for RS - 422/485 and 460.8K baud for RS - 232. Fe[...]

  • Page 13

    Specifications OMG - USB - SER - 4 Page 9 Specifications Environmental Specifications Specification Operating Storage Temperature Range 0º to 50º C (32º to 122º F) - 20º to 70º C (- 4º to 158º F) Humidity Range 10 to 90% R.H. Non - Condensing 10 to 90% R.H. Non - Condensing Manufacturing • All Printed Circuit boards are built to UL 94V0 r[...]

  • Page 14

    Appendix A – Troubleshooting OMG - USB - SER - 4 Page 10 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 adap[...]

  • Page 15

    Appendix B – How To Get Assistance OMG - USB - SER - 4 Page 11 Appendix B - How To Get Assistanc e Please refer to Appendix A - Troubleshooting prior to calling Technical Support. 1. Read this manual thoroughly before attempting to install the adapter in your system. 2. When calling for technical assistance, please ha ve your user manual and curr[...]

  • Page 16

    Appendix C - Electrical Interface OMG - USB - SER - 4 Page 12 Appendix C - Electrical Interface RS - 232 Quite possibly the most widely used communication standard is RS - 232. This implementation has been defined and revised several times and is often referred to as RS - 232 or EIA/TIA - 232. The IBM PC computer defined the RS - 232 port on a 9 pi[...]

  • Page 17

    Appendix C - Electrical Interface OMG - USB - SER - 4 Page 13 RS - 485 RS - 485 is backwardly compatible with RS - 422; however, it is optimized for part yline 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[...]

  • Page 18

    Appendix D - Asynchronous Communications OMG - USB - SER - 4 Page 14 Appendix D - Asynchrono us 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 bi [...]

  • Page 19

    Appendix E - Compliance Notices OMG - USB - SER - 4 Page 15 Appendix E - Compliance Notices Federal Communications Commission Statement This equipment has been tested and found to comply with the limits for Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are d esigned to provide reasonable protection against harmful inter[...]

  • Page 20

    Appendix E - Compliance Notices OMG - USB - SER - 4 Page 16 EMC Directive Statement Products bearing the CE Label fulfill the requirements of the EMC directive (89/336/EEC) an d of the low - voltage directive (73/23/EEC) issued by the European Commission. To obey these directives, the following European standards must be met: EN55022 Class B - ‘L[...]

  • Page 21

    W ARRANTY / DISCLAIMER OME GA ENGINEERING, INC. war rants this unit to be free of defects in materials and workmanship for a period of 1 3 months from date of purc hase. OM E G A ’ s W ARRAN TY adds an additional one (1) month grace period to the normal one (1) year pr oduct warranty to cover handling and shipping time. This ensures that OME GA ?[...]

  • Page 22

    M 3 900 /0303 Where Do I Find Ever ything I Need for Pr ocess Measurement and Control? OM EGA…Of Course! Shop online at www .omega.com TEMPERA TURE   Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies   Wire: Thermocouple, RTD & Thermistor   Calibrators & Ice Point References   Recorders[...]