How can I write VISA in labview to communicate with instrument using RS485

my instrument has a Modbus communication procotol, how can I use VISA write or read to communicate with the instrument? Thanks!

RS485 is simply a physical-layer protocol defining pinouts, signal levels and the like. To make the connection you need either an RS232-RS485 converter (check with BlackBox) or an RS485 serial IO card (check with NI). Either way, there should be no changes required to you Modbus drivers or other software.
Mike...
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Message Edited by Artemistech on 01-30-2009 11:06 PM

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How can I write VISA in labview to communicate with instrument using RS485

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