VISA bug with serial communication on MAC !

[Koen]

Hello to you all again,

I have appreciated all feed back from you about a problem encountered with serial communication on the MAC (see earlier questions)

To situate the problem:
One can only read 63 bytes back from the serial port using VISA calls (without handshaking). With the old serial VIs you can read everything back. In addition the exact same VIs do not show this problem on windows platform.

I have now performed extensive tests with a loopback on the serial port and the problem still stand.
I attach two VIs to an answer to this question (for some obscure reason I can not attach them to the question?) which do the basic loopback, one uses VISA the other the old serial VIs. Please try them out o
n your computer (for Mac RS422 miniDIN you should connect pin 3 to 5 and 6 to 8 to do the loopback)(for windows RS232 DB9 connect pin 2 to 3) in loopback configuration (see also resource library).
Please post a message if the described problem also occurs on your MAC.

Thanks to all of you for your cooperation!!

[Koen]

here are the VIs a promised

[Doug C]

Hello Koen,

From what I understand there is an incident report that has been turned in on this to R&D. The behavior is specific to the MAC, and the two VIs I pulled down ran like a champ on windows, but not on a MAC clone (SuperMac). At this point I could not find a work around.
Doug