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From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
03-24-2014 11:04 AM
Hello,
I recently downloaded the euotherm labview driver from ni.com and I am using this USB to RS485 converter http://www.kksystems.com/english/html_files/product_pages/usb485.htm for communication, unfortunately I keep getting this error when using both example VI's.
1. When I use the process value monitoring example vi
Error -1073807339 occurred at VISA Read in Eurotherm 32xx Series.lvlib:Utility MODBUS RTU Receive Message.vi->Eurotherm 32xx Series.lvlib:Utility Read From Register - Floating Point.vi->Eurotherm 32xx Series.lvlib:Utility Read From Register - Float or Int.vi->Eurotherm 32xx Series.lvlib:Read Process Variables.vi->Eurotherm 32xx Series Process Value Monitoring.vi
2. When I use the temperature control monitoring example vi
Error -1073807339 occurred at VISA Read in Eurotherm 32xx Series.lvlib:Utility MODBUS RTU Receive Message.vi->Eurotherm 32xx Series.lvlib:Utility Read From Register - Integers.vi->Eurotherm 32xx Series.lvlib:Utility Read From Register - Float or Int.vi->Eurotherm 32xx Series.lvlib:Configure Instrument Mode.vi->Eurotherm 32xx Series Temperature Control Monitoring.vi
Can someone please help with this?
03-24-2014 02:04 PM
03-25-2014 04:51 AM
Hello Albert,
My current RS485 serial configuration settings are; baud rate = 9600, parity = none, break length (timeout) = 2ms (all default values from the eurotherm manual), and the modbus address I am reading from is address 1, which from the manual is the temperature input value.
Is this correct, or am I still doing something wrong?
03-25-2014 08:06 AM
Hi dexterpoet,
I have found a potential solution for you.
Please have a look at this article:
http://digital.ni.com/public.nsf/allkb/874B379E24C0A0D686256FCF007A6EA0?OpenDocument
I hope it helps!
Kind Regards,
03-25-2014 09:33 AM
03-25-2014 10:54 AM
Hi Albert,
I am using this USB to RS485 Serial converter http://www.kksystems.com/english/html_files/product_pages/usb485.htm and it is already terminated. Is there anything else I need to do to make it work right, if this is the problem?
Thanks for your help
03-27-2014 04:14 PM
06-24-2017 02:25 PM
I have the exact same issue as you.
Were you ever able to find a solution? Could you please share it with me?