about VISA write value

[cantata2014]

I want to write a freuquency value into VISA write buffer. but the integer part and fractional part should be written in different registers.

this is what I've done:

but the array cannot connect with the VISA string. How can I change the configure? Thanks!

[Neos]

you should write to each register one by one.

VISA write does not accept clusters.

[dkfire]

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@cantata2014 wrote:

but the array cannot connect with the VISA string. How can I change the configure? Thanks!

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That is not an Array, but a cluster that you are sending to VISA Write.

[crossrulz]

I think what you really want is Concatinate Strings.

[cantata2014]

but after combining them by using concatenate string, the string becomes 64bits, isn't it?

[mikeporter]

No, it just becomes a longer string. The number of bits is only a factor for a number that is being expressed as a single binary value. You are creating two commands that each consume 4 bytes. Concatenating them will produce a single string 8 bytes long.

Mike...

[crossrulz]

Just a fair warning.  A lot of instruments do not like to recieve commands back-to-back like this.  You may need to use two VISA Writes (one for each command) with a small delay in between to allow the device to process each one.