NI-488.2 installation issue for windows 7

[asso24]

my device is a relai multifonctions (rs-485 modbus rtu) , I will control it from my labview interface 

[Dennis_Knutson]

Which should have come with a manual that you need to read. Surely you know the make and model. You haven't provided that so how can anyone answer your questions?

[Dennis_Knutson]

And how do you think you can communicate to an RS485 device if you have an RS232 converter? They are different!

[asso24]

the device is The LUCM or LUCMT multifunction control units perform the following protection functions:
 Protection against over-currents (protection not provided by LUCMT)
 Protection against thermal overloads, with choice of trip class from 5 to 30
 Protection against ground faults
 Protection against phase imbalances
 Protection against mechanical jams during or after the start-up phase.
 Protection against idling
 Tripping of the starter via an external signal (as an option)

The protection,functions may be configured and monitored:
Locally, using the built-in display and keyboard
Remotely, using:
 An RJ-45 communication port, Modbus RS 485

the relai has a registers, and each register contains the  parameter that we will controlled it 

in the company they use rs485/rs232 converter to connect it to the pc , but in my own pc I don't have rs232 port so I use an adapter rs232/USB 

[Dennis_Knutson]

Well, you bought the wrong adapter if the device is RS485.

[asso24]

why ? what's wrong with it?!

[Dennis_Knutson]

It's RS232 and you just said the device requires RS485. Don't you understand the differences? Please do some basic research.

[asso24]

yes I understand the difference very well , there is a converter rs232/rs485 to connect it to the pc , in the company they has used this device with the logiciel modscan and it works  very well ( they can read the data using the converter),now the company need to provide this issue using labVIEW so my project is to create a labview interface for reading the data contained in the relai but I do not have the port rs232 so I use rs232-USB converter 

[Dennis_Knutson]

So you have a separate RS232 to RS485 converter as well? That was not clear from your posts. I don't understand where you are stuck now. The modbus spi for LabVIEW contains all of the functions for setting address to read and returning the register content.

[asso24]

my question was how can I rely the visa fonction with the MB serial Master query , as well as the class of my USB is USB RAW so I changed the visa class i/o session from usb instr to usb raw  , yet the error was appear plz check the piece joint