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Appendix A – Troubleshooting 

OMG-USB-SER-2

 

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 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. This can be done by using either the Windows 98/ME or Windows 
2000 Device Manager. 

2. 

Ensure that the software has been installed on the machine so that the 
necessary files are in place to complete the installation.  

3. 

When the 

OMG-USB-SER-2

 is configured properly, the USB Enabled LED 

(E) will be lit. This should allow you to use the WinSSD utility and the 
supplied loopback plug to check communications. The supplied loopback 
plug connects TD to RD.  If you decide to test the Modem Control Signals, a 
full pin loopback plug will be required.  Details on loopback plugs are 
included on WinSSD.  Contact Omega if you need further assistance 

4. 

When testing the 

OMG-USB-SER-2

 in loopback mode, you should see the 

port LED’s flashing as well as seeing echoed data on the screen. The 
loopback test first transmits a HEX pattern, 55AA, and then a ASCII string 
of data. If this test passes, then the 

OMG-USB-SER-2

 is ready for use in 

your application. 

5. 

Please note that if the adapter is configured for 2 wire RS-485 with no echo a 
loopback test is not possible. The receiver in this case will be turned off and 
the test will fail. If you plan on using this device in two wire mode test the 
adapter in RS-422 mode first. Then configure the adapter for your 
application. 

Содержание OMG-USB-SER-2

Страница 1: ...www omega com e mail info omega com User sGuide OMG USB SER 2 Two Port RS 232 422 485 to USB Adaptor Shop online at...

Страница 2: ...TCH EXAMPLES CONTINUED 7 TECHNICAL DESCRIPTION 8 FEATURES 8 CONNECTOR PIN ASSIGNMENTS 8 RS 422 485 DB 9 Male 8 RS 232 DB 9 Male 8 SPECIFICATIONS 9 ENVIRONMENTAL SPECIFICATIONS 9 MANUFACTURING 9 POWER...

Страница 3: ...COMMUNICATIONS COMMISSION STATEMENT 15 CANADIAN RADIO INTERFERENCE REGULATIONS 15 EMC DIRECTIVE STATEMENT 16 Figures Figure 1 Switch SW2 5 Figure 2 RS422 485 Interface Configuration 6 Figure 3 Electr...

Страница 4: ...s that it does not 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...

Страница 5: ...ther at the PC host or an upstream hub The OMG USB SER 2 is hot pluggable meaning there is no need to power down your computer prior to installation Connect the OMG USB SER 2 to an upstream host or hu...

Страница 6: ...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 hardwar...

Страница 7: ...e box must be opened Do this by removing the four screws located on the bottom When reassembling please note that the top and bottom are keyed to fit in only one direction Electrical Interface Selecti...

Страница 8: ...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 resistor to RX PD 485 option OFF for 422 OFF No effect ON Adds a 1 K ohm pul...

Страница 9: ...pedance when the device is not actively transmitting data NE 485 option OFF for 422 OFF The receiver is always enabled In a two wire setup the receiver will echo back all transmitted data ON The recei...

Страница 10: ...unt 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 NE 2 and Port 2 L L T PU...

Страница 11: ...s for USB Enabled and port activity Connector Pin Assignments RS 422 485 DB 9 Male Signal Name Pin Mode GND Ground 5 TX Transmit Data Positive 4 Output TX Transmit Data Negative 3 Output RTS Request T...

Страница 12: ...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 Power Consumption This device is a high power USB device...

Страница 13: ...E will be lit This should allow you to use the WinSSD utility and the supplied loopback plug to check communications The supplied loopback plug connects TD to RD If you decide to test the Modem Contr...

Страница 14: ...n a computer ready to run diagnostics 3 Omega Engineering maintains a home page on the Internet Our home page address is www omega com The latest software updates and newest manuals are available via...

Страница 15: ...c states The RS 232 and the EIA TIA 574 specification define two types of interface circuits Data Terminal Equipment DTE and Data Circuit Terminating Equipment DCE The OMG USB SER 2 is a DTE device RS...

Страница 16: ...and 32 receivers to be connected to one line This interface is ideal for multi drop or network environments RS 485 tri state driver not dual state will allow the e lectrical presence of the driver to...

Страница 17: ...f a pre defined number of stop bits usually 1 1 5 or 2 An extra bit used for error detection is often appended before the stop bits Remain Idle or next start bit Odd Even or Unused STOP P BIT 5 to 8 D...

Страница 18: ...e separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV t...

Страница 19: ...022 Class B Limits and methods of measurement of radio interference characteristics of information technology equipment EN55024 Information technology equipment Immunity characteristics Limits and met...

Страница 20: ...shall not exceed the purchase price of the component upon which liability is based In no event shall OMEGA be liable for consequential incidental or special damages CONDITIONS Equipment sold by OMEGA...

Страница 21: ...city Indicators Turbine Paddlewheel Systems Totalizers Batch Controllers pH CONDUCTIVITY pH Electrodes Testers Accessories Benchtop Laboratory Meters Controllers Calibrators Simulators Pumps Industria...

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