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Which pins do I use to receive data from PDS ELITE RS485 with the PXI 8431/2?

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Hello!

 

I am using the PXI 8431/2 to read out data from the PDS ELITE flowmeter (Modbus RTU). For receiving data, the RS485 protocol asks for pin 4 and 5, but this configuration does not seem to work. When I connect the RS-485 to USB converter from Microflex I do receive the data properly, so somehow between the pin lay out and the PXI there is this problem.

 

Can somebody help me out?

 

Cheers,

 

Steven

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Hello,

 

Could you check the below link?

 

http://force.natinst.com:8000/pls/ebs/niae_screenpop.main?p_incident_number=877874

 

Hope this helps.

 

Kind regards,

Hossein

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Hello Hossein,

 

your link is not working. Even https://force.natinst.com/ is not found with my browser...

 

Rgds,

 

Steven

 

 

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Solution
Accepted by topic author StevenSablerolle
08-27-2015 04:09 PM

Hello Steven,

 

I think what Hossein was trying to send you is this:

 

How do I Connect and Configure a 2-Wire Device With RS-485

 

Can you also tell me a bit more what you are using to read the data? What environment. Do you have 2 wire or 4 wire Modbus RTU?

 

Regards,

 

Rik Prins, CLA, CLED
Applications Engineering Specialist Northern Europe, National Instruments
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Hello Rik,

 

thank you very much! As I followed the link, we have shortcutted pin 4 with 8 and 5 with 9. Setting the it to half-duplex, the transmitter and receiver data can now go through the 2 wire cable.

 

Best regars,

 

Steven

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