Mistake 1073807302 by using VISA Read

[Stefan1101]

Hello,

I want to communicate with a photometer, that used a HID interface. The device use a PIC24FJ.

The photometer is new (published in the last month) and the interface protocol isn´t published yet, but I got a preliminary version from the producer.

I created a driver by using VISA Driver Wizard and the device is in MAX visible.

Now i can use "VISA Write" and the device react to the commands, but it isn´t possible to read the data from device. 

Mistake No. 1073807302

When I try to read the data by using the VISA test panel in MAX I get a "Read Operation Error  0xBFFF003A".

Also I tried to communicate by using mcHID.dll (Link), but LabVIEW always crashed.

I attached my VISA Test VI.

Have anyone an idea, which can solved my problem?

Stefan

[mtwar]

Hi,

Try to use VISA Configure Serial Port on the very beginning to set up transmission parameters properly.

Have you tried to put some delay between write and read?

Marcin

[Stefan1101]

Hi Marcin,

thank you for your answer.

I use the class USB Raw, so it isn´t possible to use "VISA Configure Serial Port".

Also I tried to insert a delay between Write and Read by using the Express VI Delay, but I don´t succeded. The problem is also there, if I want only read from Device in a VI.

Stefan

[mtwar]

I have no idea how to deal with this error. Can you maybe try to use dlls from the manufacturer of the device? Are they available for you?

[Stefan1101]

I´ve got the code from a Demo application by manufracturer, which can communicate the device.

When I understand the c code correct, they used the setupapi.dll. So this way have to be possible.

But first I want to try to solve this problem by using VISA, because this should be much easier?!

Maybe someone else have got any idea?