LabVIEW
Instrument Control Issue (What Data Type to Indicate Channel Index? ASCII, HEX, DEC?)
I'm trying to control an old Kikusui DPO2212A controller. I can get it to output the correct voltages, but it does it to both channels 1 and 2 instead of the ones I'm telling it to!
Details:
The format of a control string for this device is AYKXXXV, where:
Y: channels 1-3
XXX: value between 000-999
PROBLEM:
If I plug in any single digit number for Y, both DAC outputs will turn on with my desired voltage. I've checked the hardware connections and they are correct.
LABVIEW QUESTION: how come the instrument accepts my A, K, 000-999 characters as is, but does not accept numbers 1, 2 correctly such that the appropriate channel turns on instead of all channels? do I need to format this number differently?
* The screenshot below shows a typecast that does not currently work. The default configuration is actually to directly feed the AYKXXX string into the concatenation block.
Additional Note:
In the product manual, they use some ancient program to place the code in. I'm not sure what this program does to the channel index (1-3) as it is not indicated in the datasheet.
@AnalogEE wrote:
LABVIEW QUESTION: how come the instrument accepts my A, K, 000-999 characters as is, but does not accept numbers 1, 2 correctly such that the appropriate channel turns on instead of all channels? do I need to format this number differently?
* The screenshot below shows a typecast that does not currently work. The default configuration is actually to directly feed the AYKXXX string into the concatenation block.
I don't know, you didn't show us the part of the code that has the 999 part. But I do see the problem with the 1 or 2 part.
The "ancient" code 🤣 you attached tells the secret. (That is called BASIC by the way.). It tells you that you want to have the "2" as a string.
So don't put in an integer 2 and typecast that will send the ASCII code for STX, not the character 2.
Just type "2" in a string constant.
If you do have it has an integer control, then you want to do a Format Into String to turn it into the character "2".
Overall, format into string would be the best choice. Then the code would look like this.
