NI 9871 & cRIO

Hi,
I am working with a NI 9871 (serial RS485) an I seems to have a problem with sending a command to a instrument.
The instrument is connected to the NI 9871 with 2 wires, which is connected to pin 4 og 8(+) and pin 5 og 9(-) on a DB-9 connector. Is this a 2 wire connect or 4 wire? I ask because when I sent a sing to the port on the NI9871 I get the same string back if I use 4 wire mode but nothing if I use 2 wire mode.
This instrument needs a 4 letter ASCII string and will return a long string with data. In order for the instrument to recognizes that a command is being sent it needs a break signal. The instrument manual says this about the break signal:
“The break Signal suspends the character’s transmission on the serial line, setting it to a break status. In this status, the voltage level of the transmission line from the computer to the Anemometer passes from nominal -12V to +12V. “
Does Labview sent this kind of break signal?
-gjels

Here is the proigram I have been working on
Attachments:
Serial_test.zip ‏445 KB

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Hi,
I have a PCIe-based RS422 card that can write to our NI 9871 cRIO module at 460.8 kbaud but the data is garbled at 921.6 kbaud (which is supposed to be supported ion the 9871).
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Hey Ryan:
Thanks for reply.
I indeed saw those papers you mentioned and implemented what they instructed, including downloading a Serial Loop self test vi.
Still no go..
Is it possible the order in which software is loaded has an effect?
For another data point I tried running the serial loop test on the controller port 1 serial port and it worked fine. Its just with the modules I'm not having any
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MAX screen shot.jpg ‏158 KB
Project screen shot.png ‏96 KB

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4. Not use the NI 9871, and use the serial port on the Crio with a custom modbus device. This leads to a timing issue as I have five devices that I would like to interact with from one port. May reduce functionality.
Solved!
Go to Solution.

An update, since I found a method that worked pretty well and was easier than I expected.
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I wrote a custom device that opened a VISA session to my port and then was able to implement the code I needed to communicate with my rs485 device. I was using modbus protocol and all of the functions worked inside of my custom device with no modification. I could also adjust the VISA settings in MAX and could run a VI from my pc that would send/recieve data to the ports. This will be useful as an additional way to test/change parameters on my rs485 devices outside of NIVS.
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Error 65575: overrun error while reading data from NI 9871

Hello everyone,
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Accéder à la solution.

Bonjour,
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Attachments:
SubVI1.PNG ‏50 KB
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I am recieving an Error code when I try to compile a program to an FPGA chp in a cRIO but I don't know what the code means.

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Message Edited by Huter on 04-29-2009 04:16 PM

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Exito en tu aplicación
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Attachments:
NI Vision Acquisition Express Error for NI cRIO 9022.JPG ‏39 KB
IMAQ and dx Modules Installed on my NI cRIO 9022 hardware(No NI Vision Acquisition 2010 SP1).JPG ‏82 KB
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