I have been very happy with the products from B&B Electronics:
If you are using RS-422 or RS-485, the first thing you will want to do is read their excellent RS-422/485 Application Note:
I have used their 3PXCC2B cards with great success. This is a dual serial port ISA card. Each port can be setup as RS-232, or RS-422, or RS-485.
One thing I love about B&B is that they provide full manuals and schematics on-line, so you can examine the details before you buy.
I have used several of their RS-485 converters. Check out the available versions at:
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Ray A. Rayburn
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