Chromalox 6040 and 6050 temperature controller with RS485

 I have a Chromalox heater and the Tempererature controllers (6040 and 6050).  Both controllers has the RS485 hook-up.  I would like to know how to communicate with these devices.  The devices themselves can function as an stand alone units with PID controller installed. These devices can be used with automatic or manual control.  I would like to set it on automatic and control it from Labview.  I am currenlty using the Fieldpoints modules with Labview 2009. I have several questions: 1. can I wire the RS485 2-wire connector directly to the field point module?  2.  if I need an RS 485 converter, I will use the RS485 to USB.  Would I then just use the RS232 visa? 3.  there are two connection on the controller for the RS485, I am not sure how to wire that together as twisted wire.  I have looked at the forum on the subjects and find bits and pieces of info..  I would like more directions.
Thank you,

Sorry, I believe I convoluted the issue here at hand.  Let me retract my earlier statement and say this.  Your FieldPoint module has the RS232 port on it, where you can write serial commands out to the device (I mentioned using Optomux earlier, while this is possible, upon second thought it is unnecessary).  You can then have the RS485 port write out to your temperature controllers.  Is this what you are trying to accomplish?  You should be able to wire the connections directly to the FieldPoint module.  Sorry for convoluting the issue earlier.  Does this answer your question more closely?  You mentioned using an RS485 to USB converter, where does that come into play?  I understood that you wanted to go from the FieldPoint RS485 port to an RS485 port onthe temperature controller?
Shane C
Applications Engineer
National Instruments

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