08-09-2005 12:53 AM
08-10-2005 08:48 AM
Hello Spring,
This question was already answered in the following post (http://forums.ni.com/ni/board/message?board.id=190&message.id=2820). If you are getting this error, it is because there is no communication to the modbus box. Again, make sure that the configuration is ok, that you are using the correct cable and that the modbus is powered on. As Khalid said, check your serial port to make sure that it works. You might have software that could be using the serial port like a PDA or something like that. Make sure that the serial port works and check the rest of the things. Make sure also that the modbus address is set to 1 in case of the demobox.
Ricardo S.
National Instruments