Hello，I am using VEE to control a RS232 equipment and the connection is good. The problem is I can control the equipment well but I don t know how to read data. I can see it have responded in the Serial debugging assistant, but no response when I use " read "in Vee.
Is someone can help with this?
Hi Stan，
Tried to read ...This time I can see the program was finished but still no output.
If your DIO object ran to completion then there there IS an output. So if there is truly nothing on the output then either the DIO didn't run or it ran and then the data was later deleted, as in pre-run if you have multiple independent threads. But remember these are binary values not ASCII characters so there's no reason why they would necessarily show up in your alphanumeric display which is only going to show printable characters.
However you should see a byte array on the line, not a nil, even if the data is invalid. Without knowing anything more about your program, good old sequencing is the likely suspect. That is- how sure are you that the DIO object actually ran? Turn on the debugging tools (show execution/show data) and watch to see what happens. Single-step if needed.
Stan
Hi Stan，
It should be a equipment/connection issue since it workes find without changing anything just restarted the equiment.Thank you .
Hi Stan,
Now there is an data on the output, but the data type is UInt 8，different with that we can get from the SPU（HEX）.How can we convert the data?
There's not really a conversion involved- just formatting- unless you consider change of base a conversion. The byte 17 can be formatted as a decimal value or as a hex value, as in
Just two ways of showing the same value. Elsewhere you might want binary (00010001) or octal (#Q21) or any other format, but a byte is a byte, so underlying the formatting you still just have a single value.
Stan
Just as VEE problems are usually sequencing, IO problems (after connection) are usually due to lack of knowledge about what is being sent or what needs to be sent. The bus monitor is the first thing I usually suggest for IO issues like this.
In this case though the bus monitor isn't needed since you already have everything you need in your screenshots.
Your earlier problem was that you were comparing the SPU's binary write to an ASCII write in VEE. Same issue here: your SPU example reads binary values and your VEE example attempts to read ASCII so doesn't work. It times out looking for HEX values in ASCII format which never arrive. Your SPU screenshot shows that you send (Tx) 6 bytes and receive (Rx) 2 bytes. Hence your instrument is sending two bytes and you need to read two bytes.
try READ BINARY x BYTE ARRAY:2
Stan