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Table of contents for the manual
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www .omega.com e-mail: info@omega.com U ser ’ s Guide OMG-USB-SER-2 T wo Por t RS-232/422/485 to USB Adaptor Shop online at[...]
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Contents I NTRODUCTION ..........................................................................1 O VERVIEW ................................................................................................ 1 W HAT ’ S I NCLUDED ................................................................................ 1 I NSTALLATION .......................[...]
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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 IREC TIVE S TATEMENT .................................................[...]
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Introduction OMG - USB - SER - 2 Page 1 Introduction Overview The OMG - USB - SER - 2 equips the PC with 2 USB to RS - 232/422/485 Asynchronous serial ports providing a versatile interf ace 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[...]
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Installation OMG - USB - SER - 2 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 98 installat ion. Your particular operating system may differ slightly from what is shown based on your version of Windows. [...]
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Installation OMG - USB - SER - 2 Page 3 You can access your new COM: ports by using the assigned COM: identifiers as shown above. In this case, it is COM 3 and 4. However, this assignment will vary from system to system. At this point, the hardware i s recognized and ready to use.[...]
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Configuration OMG - USB - SER - 2 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 configuration the box mus t be opened. Do this by removing the four screws located on the bottom. When reassembling pl[...]
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Configuration OMG - USB - SER - 2 Page 5 Switch Descriptions Figure 1 : Switch SW4 L 4 85 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 - up resist [...]
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Configuration OMG - USB - SER - 2 Page 6 Switch Examples Figure 2 : R S422/485 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 not actively transmitting data NE 485 option, OFF for 422 OFF[...]
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Configuration OMG - USB - SER - 2 Page 7 Switch Examples Continued Port 2 Port 1 Figure 3 : Electrical Interface Configuration Port 1 : RS - 232 The corresponding shunt is in the 232 position. The switches will have no effect. Port 2 : RS - 485 two wire communication with no echo. The corresponding shunt is in the 422/485 position. Switches 485 2, [...]
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Technical OMG - USB - SER - 2 Page 8 Technical Description The OMG - USB - SER - 2 utilizes two USB UARTs. These chips feature programmable baud rate, data format, 128 byte Dual Port TX Buffer, and 384 byte Dual Port RX Buffer. The RS - 232/422/485 transceiver supports data rates u p to 921.6K baud for RS - 422/485 and up to 460.8K baud for RS - 23[...]
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Specifications OMG - USB - SER - 2 Page 9 Specifications Environmental Specifications Specification Operating Storage Temperatu re 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 [...]
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Appendix A – Troubleshooting OMG - USB - SER - 2 Page 10 Appendix A - Troubleshooting Serial Utility t est 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 ada[...]
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Appendix B – Ho w To Get Assistance OMG - USB - SER - 2 Page 11 Appendix B - How To Get Assistance Please refer to Appendix A - Troubleshooting prior to calling Techn ical Support. 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 curr[...]
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Appendix C - Electrical Interface OMG - USB - SER - 2 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[...]
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Appendix C - Electrical Interface OMG - USB - SER - 2 Page 13 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) o r Tri - State (disabled). This capability allows multiple ports to be connected in a[...]
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Appendix D - Asynchronous Communications OMG - USB - SER - 2 Page 14 Appendix D - Asynchronous Communications Serial data communications implies that individual bits of a character are transmitted con secutively to a receiver that assembles the bits back into a character. Data rate, error checking, handshaking, and character framing (start/stop bit[...]
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Appendix E - Compliance Notices OMG - USB - SER - 2 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 designed to provide reasonable protection against harmful interf[...]
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Appendix E - Compliance Notices OMG - USB - SER - 2 Page 16 EMC Directive Statement Products bearing the CE Label fulfill the requirements of the EMC directive (89/336/EEC) and of the low - voltage directive (73/23/EEC) issued by the European Commission. To obey these directives, th e following European standards must be met: EN55022 Class B - ‘L[...]
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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 ARRANTY 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 ?[...]
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M 38 9 9 /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 Recorder[...]