Re : Connecting 9871 in two wires mode

[SmileBoB]

Hello,

I'm currently trying to use 9871 in two wires mode.

I've compiled a little FPGA bitfile that just writes  periodically a character on Port 1 of my module.

the port is configured as the following : 9600 bps, two wires auto, no parity 1 stop bit.

To receive this char i use  a RS485=RS232 converter that works fine with some instruments working on rs485. This converter has two line inputs : + and - .

My question is the following, which are the 9871 lines to connect to this pin when it is configured in two wire modes ?

I didn't find any KB on this !!!!

I guess it's the RX+ and RX- lines but I'm not sure.

do someone can confirm it to me ?

Best regards, 

[Steve__M. · Accepted solution]

Hi,

You need connect TX+  RX+ & TX - RX-

Maybe this document could help :

http://decibel.ni.com/content/docs/DOC-4169

Regards,

[SmileBoB]

Hello

thanks a lot for this info, I tried it just after sending the post and it works fine.

At the beginning I was guessing that the connection was done internally by the module as in a lot of RS485 interfaces from ohter companies.

Thanks for your quick response.