Hi,I apologize for my english, it is not my native language.My situation:I use labview, and I want to measure voltage using a HP 34401A Multimeter with GPIB (using a agilent USB-GPIB adapter). Furthermore, I want to control a motor using the RS232 interface (ISEL motor control unit).Therefore, I use the RS232 of the computer (on the Mainboard). Both tasks were developed separatly and work quite fine independly. My task is to join both parts and thats were I have the problems.Problem:Case 1:In MAX, I activate the serial (NiViAsrl.dll) VISA passport (deactivate all others)-> In Labview: all serial SubVI work fine.Case 2:In MAX, I activate the GPIB (NiVisaTulip.dll) VISA passport (deactivate all others)-> In Labview: all GPIB SubVI work fine.Case 3:In MAX: I activate both at the same time-> In Labview: the GPIB works well, but the serial SubVI not. The "VISA I/O Flush" VI says Error -1073807299 (invalid buffer mask). Here's a link to that error: http://digital.ni.com/public.nsf/allkb/AD03F1520934D67F86256D4B001DC2CE Of course I checked the mask and it is like it should be (16). And it is working again as soon as I deactivate the Tulip passport in MAX. More Informations:- It is only related to this GPIB passport in MAX, the GPIB device doesn't even has to be connected.- The settings of the serial connection are default and as specified for the motor control unit. - The effect also occures in minimal examples (init the device and directly try to flush)- I tried a different computer with the setup and it fails too (same software involved, including any passports/drivers).- I tried to reinstall labview and passports/driver, still the same.- The Computer: Its a 64bit windows 7 enterprise, but a 32bit Labview 2014.My guess:The tulip passport messes around with the buffers and I am failing to find the option to change that.I tried to search the forum as well as the internet but I wasn't able to find a solution. Any Ideas?Best regardsSteKo

hello @ all, as a follow up to what we just did on site: the problem appeared because the Agilent IO Suite caused some kind of driver issues. It seemed that it is not a LabVIEW problem but an Agilent problem. Instead of using the newest version, we switched to the "Agilent IO Libraries Suite v 16.2.15823.0". The valid question would be: why this version? Because this one was often used by me in other projects without any problems and the installer was available... If someone is interested in digging deeper into the problem, feel free. For now, it seems that the older version gets the job done. greetings from Berlin. David

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