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PC interface to dif tranciever

Paul Gordon
Prodigy 60 points
Other Parts Discussed in Thread: SN65HVD09

I am trying to interface to some old existing hardware, and a PC.  The input to the old circuit card is a 9 channel differential tranciever, TI SN75LBC978.  It looks like the circuit card only uses 8 channels, anyhow just wondering if an 8 channel PCI RS485 card would work, or if there is any other way to interface to 8 channels with out building up a board?  The PC I am using only as USB as it is relatively new. 

Thanks Paul.

  • 0
    TI__Guru* 76130 points

    Hello Paul,

     

    You can use the SN65HVD09 for your new design.

    http://focus.ti.com/lit/ds/symlink/sn65hvd09.pdf

    Regards.

  • 0
    TI__Mastermind 28265 points

    Paul,

    this old card design sounds like a PCI application, hence your 8-ch PCI-RS485 card idea might work. Unfortunately we don't have a USB to PCI converter in the Industrial Interface department. However, our STELLARIS micro controller team provides all kind of interface converters in form of ready available modules. we simply deal with conversions of electrical only interfaces. When protocols need to be taken into account, such as USB and PCI, then our micro controller folks kick in.

    Let me know how the PCI card idea works. I'll try to find the USB converter mentioned before.

    regards, Thomas 

  • 0 in reply to Thomas Kugelstadt
    Prodigy 60 points

    Thanks for the response yes I think the old card was for a PCI application.  I also have some Agilent DIO cards so am thinking I will try to just program these and write out to a chip that converts TTL to differential.  Also as a backup if you can find the USB converter information that would be helpful.  Also since it is 8 channels I am wondering if you could use a single usb port with a specific type USB converer?

  • 0 in reply to Elias Villegas M.
    Prodigy 60 points

    thanks for the response, I think this IC will work with some Agilent digital I/O cards I have that produce TTL outputs.

  • 0 in reply to Elias Villegas M.
    Intellectual 810 points

    Hi Elias

    I am responding cause you proposed the SN65HVD09 for a new design.
    Does that mean that this is device is a current design and not a "soon-EOL-product"? We are evaluating this device for one of our new products, and ask ourselves if this device still will be available for some years? A second-source product will be hard to find...

    Thanks for your reply in advance
    Daniel 

  • 0 in reply to Daniel Haslimann
    TI__Mastermind 28265 points

    TI's obsolescence policy is to not obsolete a product unless its manufacturing becomes technically infeasible.

    The HVD09 is manufactured in a modern Lin BICMOS technology which will be around for many decades.

    Regards,

    Thomas

     

  • 0 in reply to Thomas Kugelstadt
    Prodigy 10 points

    We were considering the SN65HVD09 9-channel transceiver in an upcoming project that requires 8 channels of RS-422. I know that the HVD09 can send or receive, but can each channel be controlled independently? In other words, can we send on say channels 1B - 4B and receive on channels 5B - 8B at the same time? I ask because of the pin description for 1DE/RE to 9DE/RE.

     

    Thanks,
    Steven

  • 0 in reply to Steven Garcia
    TI__Mastermind 28265 points

    Pages 17 to 21 in the data sheet give you all the combinations you can perform with these chip. Your combination hould be possible. Regards, Thomas