Watlow F4D Serial Communication Problem Error Code -1073807339 VISA Read in Watlow F4.lvlib:Utility MODBUS RTU Receive Message.vi

Hi

I am trying to communicate with a Watlow F4D controller on a Chamber using RS232. I use a USB-Serial Converter Cable and NI Watlow F4D Serial Driver.

The error code -1073807339 occurs in :

VISA Read in Watlow F4.lvlib:Utility MODBUS RTU Receive Message.vi->Watlow F4.lvlib:Utility Read From Register.vi

I am not sure what caused the issue. I am able to see the USB-Serial Converter Cable in NI MAX. Please see pictures for details

Thanks

Felix