Remiain data in buffer with event VISA

Hello

I'm trying to use the VISA event to read data from a serial port. I created a simple VI to test this (see attachment).

1. I initialize the port and the event

2. in a while loop: whenever I press a button 'help' of the order is sent to my Board of directors who responds with some help instructions, which should be to trigger a series of events and lines to be read.

The event is on the characters of the term. The strange thing is that whenever I press the help, I get 'event 5' or 5 printed lines, not all 8 lines that are actually sent by the Board of Directors. If I then press 'help' once again, the 3 remaining lines (2 news since the last aid application) are read on the VI. I don't understand what is happening?

I tried to change the length of the max queue (which has no effect, if it is set to 1 or 100).

I tried to change the timeout of 50ms, but also it has no effect.

I don't know that the Board of Directors came out the right commands, I read this in a terminal.

If I jump the functionality of the event (just read the bytes to port), I can get out all the lines as expected, however I had other problems with this approach and would really like to fix this with an approach to the event. Also, I would like to understand what is happening... I would be grateful for the advice!

Best,

Maria

Do NOT use the bytes to the Port for this.  Just set the number of bytes to read if something really high.  The VISA of reading stops when the stop character is located.

In addition, I'm actually just make a separate loop that does nothing but read from the port.  No VISA necessary event.  Let just wait times occur on playback VISA if nothing comes.

Tags: NI Hardware

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