06-23-2015 10:21 AM
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
Solved! Go to Solution.
06-23-2015 12:05 PM - edited 06-23-2015 12:21 PM
Please see picture attached for more details. The errors occurs mainly at VISA READ in Receive Message.VI
Thanks
Felix
06-23-2015 01:58 PM
06-23-2015 02:02 PM
Thanks for your reply. The cables are working. I used the USB-Serial converter and the Serial Cable on other instruments before.
06-23-2015 02:48 PM
06-23-2015 03:10 PM - edited 06-23-2015 03:12 PM
I tried two other serial cable. I got the same time out error. The Modbus communication board has both Serial and GPIB connections. I tested both connections in VISA test panel. I was able to get *DIN? information using the GPIB connection. I was not able to get *DIN? information using the Serial connection. A time out error occured. What should I change in VISA property nodes in the Watlow F4 Serial Driver to enable GPIB communication ?
Thanks
06-23-2015 06:36 PM
06-24-2015 08:29 AM
The communication board connected to Watlow F4 is Synergy488. I tested the RS232 connection using an application provided by the company. I was able to get response for the *IDN? command. Does this prove that the cable is working and there is something I need to change in Labview driver ?
Please see pictures for detail
Thanks
Felix
06-24-2015 08:56 AM
06-24-2015 08:58 AM
Update :
I was able to get *IDN? response in NI Max it turned out to be syntax error. It should be *IDN?\r\n instead of *IDN?\n. I changed Baud Rate Setting in NI Max to 19200 and tried to run the VI. I still got the same error at VISA Read...