RS-485 and LabVIEW

[VTW1985]

Hi, I’m just learning LabVIEW so I’m not that good at it yet, but I’m trying to write a program that can communicate with a temperature monitoring device using RS-485.  I was able to do this using RS-232 and the given LabVIEW examples but when I switch my device to 485 and tried the LabVIEW 485 examples I can’t get it to talk.  I know the device is working because I’m able to use HyperTerminal and communicate with it.  Any one work on something like this before or have any ideas?

[AnalogKid2DigitalMan]

Are you using an National Instruments RS-485 card or an RS-232 (or USB) to RS-485 converter?

Is cabling correct?

Does the vendor have software (non-LabVIEW) you can download to test?

[Chris_R.]

Hi Vince,

Also check for proper termination as Hyperterminal automatically adds termination, but LabVIEW does not.  \r\n usually does the trick to terminate as Hyperterminal does.

[VTW1985]

Thanks Chris that was the problem