Sending a floating point through serial using VISA

[sanath.j.bhat]

how do I send a floating point number through a serial port to my microcontroller using VISA Write

[Dennis_Knutson]

How does the micro expect it? You can either typecast it or convert to ASCII string. Pick the conversion that the micro uses.

[sanath.j.bhat]

The microcontroller which I am using takes it as a byte value.

[Dennis_Knutson]

How many bytes? Typecast a sgl or dbl.

[sanath.j.bhat]

okay i got a byte array. Now how do I pass that to the VISA write?

[Dennis_Knutson]

How did you manage to get a byte array from the typecast? I have no idea what you are doing.

[sanath.j.bhat]

OK let's start over. I am trying to send a floating point value to a C program which is expecting it as a 4 byte value rather than as an ASCII string. How can I force the serial port to send it as a 4byte value rather than a ASCII string?

I managed to get a byte array using string -> number function, and then setting it to sgl representation. Is that the right way to do it? Ive added an image for a better understanding

[Dennis_Knutson]

Why are you using a string for the number. Just use a numeric control set for sgl. I already told you to use the typecast function. Why didn't you use that? I've said the same thing three times now. The default behavior for a typecast will convert the sgl to a string that you simply pass to the VISA Write.

[Dennis_Knutson]

Another option is the flatten to string. You can specify the endianess with that.

[crossrulz]

I would recommend the Flatten To String because of being able to change the endiness.  Some systems want Big Endian while others want Little Endian.  It is best to specify.