Using VISA Write to input a hex shortcut

[Rodnebb]

Hi,

I am communicating over a serial port with another device.

This device requires hex shortcuts where the most significan byte has been set.

Example: 0xA6 10100110

I want to use VISA Write to send this to my device. VISA Write takes a string, but if I try to write in A6 (in hex display for instance) this is not understood by my device.

Any ideas what I may be doing wrong?

[tibo_xlim]

I suppose your are sending order to your device with a string mode as follow :
    viPrintf (GPIB_ID, command);
where command is your string.


You should write directly on the GPIB bus the byte in binary mode :
    viWrite(GPIB_ID, (ViBuf) buffer, lSize, &actual);
buffer is your byte array,, lsize the number of bytr you are goind to send on the bus.

[Makoto]

If you are using C language, type \xA6 in the string to send.  This is control char expression of standard C languages.

[Rodnebb]

I don't nd messages to the device in a c environment, I am using LabVIEW's VISA Write vi.

The problem is that this vi takes an input string, and I have not found a way of manipulating this string so that it sends over the command I would like it to.

As it is a case of putting the right data into the buffer, this should be possible (?)

[Albert.Geven]

In LabVIEW You can change the string control (right mouse click) to show hex or pasword setting or /codes and even normal view.
In this mode you also can type in HEX.

Remember
 Instruments that want hex strings normally don't want what is in the manual but a binary value that in the manual is typed in hex representation.

So put your control in hex mode and try it with your instrument.

[Rodnebb]

I have tried putting the input string into hex mode and writing my code there (in HEX). This doesn't work.

As far as I know, I cannot change VISA Write to work in another mode, som I'm still stuck.