Communication Error between Vectrino Profiler and Serial Hub

Up to System integration and telemetry

Communication Error between Vectrino Profiler and Serial Hub

Posted by Hannah Ross at October 31. 2014

Hello Everyone,

I am using a Vectrino Profiler and am experiencing a connection issue when trying to communicate to the instrument via a Moxa UPort 1650-8 USB to 8-Port RS-232/422/485 Serial Hub. I currently receive an error saying "Vectrino II - Unsupported setup operation on serial port" when trying to connect. I have tried different settings and every baud rate, and I continue to receive the same error. Is there a way to correct this error? Or perhaps a different serial hub that is known to be compatible?

Note: The instrument performs properly when connecting directly to the computer via the supplied serial to USB converter. However, my setup requires connecting via a serial hub. 

 

 

Re: Communication Error between Vectrino Profiler and Serial Hub

Posted by Robert Craig at November 01. 2014

Hi Hannah:

   Unfortunately, we haven't tested any multi-port hubs for use with the Vectrino Profiler at this point. The unsupported setup error is usually as a result of an unsupported baud rate, but if you've tried other baud rates then that's likely not the issue.  Out of curiosity, do any other serial devices work with the hub?  Do the drivers for the hub produce a virtual COM port interface that lets software configure them exactly like a "normal" COM port?


You should double check that the hub is using RS-422 for communications, and that you've selected the correct COM port for the connection.  One other thing that you can do is to set up the Profiler at a given baud rate with the normal USB-Serial converter and then connect it into the Moxa hub and manually configure the port to match the instrument baud rate.  When the instrument is first turned on, it sends an identification string out the serial port, so you should be able to look at the port with a terminal emulator to see if that string gets through.  If it does, then there's a driver configuration problem with our software.  If it doesn't then there's a problem with the Moxa hardware.

      Robert.

Re: Communication Error between Vectrino Profiler and Serial Hub

Posted by Hannah Ross at November 03. 2014

Hi Robert,

Thank you so much for the information! Yes, several other serial devices work with the hub. Every other serial device in my experimental setup is using it, including a Nortek Vector, which is communicating without any issues at all. The Moxa driver does produce a virtual COM port interface, and when trying to connect, it shows that the Vectrino software is searching every available baud rate.

Every time I attempt to connect, I check that the correct COM port is selected and that it is configured for RS-422. I tried your suggested test, connecting via the normal converter, setting the baud rate, then configuring the Moxa hub manually with the same settings. I tried this test using both the Vector connected via the Moxa hub and the Vectrino connected via the normal converter. Both yielded the correct response (the identification string showed up), so I know the test was working correctly. However, when I tried the Vectrino connected via the Moxa hub, there was no response (the string did not get through), meaning there is a problem with the Moxa device. Do you know if this is a problem that would be possible to fix by adjusting settings on the Moxa hub, or is something wrong with the actual hardware itself?

Thank you!

Hannah

Re: Communication Error between Vectrino Profiler and Serial Hub

Posted by Robert Craig at November 04. 2014

Hi Hannah:

  If the Vector works, it doesn't seem very likely that the Moxa hardware is broken.   I'm not sure how you're connecting the Profiler into the Moxa, but the next thing to check is the wiring.  RS-422 doesn't have a standardized pin-out like RS-232.  According to the Moxa manual, they use pins 1/2/3/4/5 for TX-/TX+/RX+/RX-/Gnd (Chapter 3 of the Moxa user manual) for the DB9 connector.  The Profiler uses 2/7/3/8/5 of the DB9 for the same signals (page 11 of the Profiler manual and don't forget that you have to connect RX to TX).  It looks like the Moxa comes with a terminal block that you may be able to use to cross-wire things as required.  If we can get that start string transmitted through, then hopefully the software will "just work".

    Robert.

Re: Communication Error between Vectrino Profiler and Serial Hub

Posted by Hannah Ross at November 04. 2014

Thanks, Robert! Cross-wiring worked, and the Vectrino connected with no trouble. I really appreciate the advice!

Hannah 

Re: Communication Error between Vectrino Profiler and Serial Hub

Posted by Robert Craig at November 07. 2014

And thank you for testing the Moxa hub!  At least we know that's available as an option to others now :>

 

     Robert.

Re: Communication Error between Vectrino Profiler and Serial Hub

Posted by yolo at April 15. 2019

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