Kepware UCON Driver

[Kepware_User]

Dear Community,

I've got a problem on my hands with the KepwareServer Ex Ucon-Driver.
The driver can't recognize the string I got from a device - this message pops up.

in the communication logs I can see that the machine communicates; 

The Read-Response transaction is set to "terminated by stop characters" which are "SP""CR"EOT", which are also the received characters. Despite that, the driver is not recognizing the characters?
"Frame has a known length" also doesnt work, despite getting the right frame size from the machine.

I am using Ethernet Enc. over a MOXA converter to get to the machine - when I used a virtual serial port, it worked, but was a lot slower. 

Kind regards,
Kepware User 

[ntripathi · Accepted solution]

@Kepware_User 

Greetings,

I would like to inform you that the reason behind this error is "the combination of "data start byte" property of the Update Tag command and tag data size have caused to driver to attempt to access non-existent source buffer elements". 

Please follow the below steps:-

This command can only operate on bytes received by the last Read Response command, previously stored in a Scratch buffer or global buffer, or the 16-bit values stored in event counter buffers. Make sure the sum of data start byte and the data length (2 for word, 4 for float, and so forth) does not exceed the number of bytes in the source buffer.

Reference document is here:-

https://www.ptc.com/~/media/kepware-store/en/manuals/user-configurable-ucon-manual#page=139