Instrument Control (GPIB, Serial, VISA, IVI)

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not working RS485 on crio9045

I want to use the onboard RS485 on the crio9045 but without success. 

I connected the TXD+ pin with the RXD+ pin and the TXD- pin with the RXD- pin as descript in the loopback test (http://www.ni.com/tutorial/3450/en/)

In the MAX I try to sent the *IDN?\n command. As a response it get a timeout.

 

As second option I have an USB-485 NI. But the crio is only detecting an unknown usb device.

 

Is there some software / driver that I need to install to let it work?

 

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Hi,

 

Some manufacturers reverse the + and - pin. 

You could try this. 

 

Kees

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