Hello
thanks for your ideas.
I wrote an extra programm only for COM1 and only with the VISA Read task and tried two things:
1. When I close the VISA session immediatelly after configuring the port, disableing the termination character, setting the buffer size and writing the print order the following thing happens (this is the way a had done until now): I can read only 22 byte, independent of how many bytes are at the port (bytes at port = byte count at the VISA Read vi, but this number is not equal to the read count at the VISA Read vi)
2. I closed the VISA session after the while loop with the Read vi, I mean at the end of the programm. In this case I can read as many bytes as exist at the port. (bytes at port = byte count at the VISA Read vi = return count at the VISA Read vi) But the string I read are squares and strange signs but no numbers.
I'll attache the 2. version.
Zane