Writing numbers in Visa

[neemtt]

Hello All

    viWriteBuffer[20] = 0x00;
    
    sprintf( timeInterval, "0x%X", txInterval );
    
    viWriteBuffer[21] = *timeInterval;        //time period - set to 10 seconds for now  (0x0A)
    
            
        status = viWrite( gateway, viWriteBuffer, viWriteBufferSize, viWriteDataSize );

I have a buffer (viWriteBuffer) which I am using to send a message to VISA.  The last byte, I take a number from a numeric control, convert it to hex, and then write that number to VISA.  However, when I look at the message I am sending to visa, the writeBuffer variable shows that I am always sending a 0x30, no matter what I change the numeric to.  Does anyone know if this is a formatting issue with VISA and if there is any way around it?
Note:  The variable timeInterval is associated with the right numbers (if my numeric control is set to 15, the timeInterval variable associated with viWriteBuffer[21] is equal to 0x0F...)

neemtt

[jr_2005]

But seeing as how you are writing either the value "0x0A" or "0x0F" into the string variable timeInterval, it is not surprising that the first character shows as 0x30 - this being the ASCII value of the leading "0" in your string.

JR