eurotherm 3216 labview error

[dexterpoet]

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?

[Albert.Geven]

The timeout error always happens when no one answeers.

So either your rs485 settings are wrong or you don;t have the right address for the eurotherm.

[dexterpoet]

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?

[M.Kuznetsov]

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,

[Albert.Geven]

And did you check that you have the right cable?

rs485 is not equal to rs232 !

you need two wires for sending and receiving and they should be terminated when the distance is long.

Furthermore your rs485 card should switch from send to receive in time.

[dexterpoet]

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

[Albert.Geven]

I found at th e link you provided the following feature

 User-selectable RS422/485 modes: RS422 or 2/4-wire RS485

did you select the correct mode for the Eurotherm?

[nano_research]

I have the exact same issue as you. 
Were you ever able to find a solution? Could you please share it with me?