rs232 so slow, why?

[RPalma]

Hello

I'm using a serial Visa at 128000bps. I'm using a handshake thats working like this: I send a char from Labview to the Pic with Visa write then the PIC responds with 5 bytes of data that are read with a Visa read. The problem is that I need  a better sampling rate, right now the PIC is sampling at 96us and Labview is taking 62ms with the write-read-display cycle. So im loosing too much data.

How can I solve this problem?

Thanks in advance.

[Ben]

"write-read-display "

Have you tried without the "display" part?

If it works better you should chase down a producer consumer design pattern to sepearte the I/O from the GUI.

Ben

[RPalma]

Hi Ben, thanks for your reply.

The display part is only a wire connected to a waveform chart/graph. Yes, I've tryed without the waveform and the processing time continues above 60ms. There's something to increase the speed of loops?

Thanks.

[TCPlomp]

Hi RPalma,

move the code where you set the baud rate outside the while loop. You'll only have to set this once. Also try to code  a little tidier, use left to right  coding style.  And if you have to read faster, isn't it possible to read more than one sample at a time?

Ton

[RPalma]

Hi TonP, thank you for your reply. I will do what you've said about the baud rate. The code is a bit messed up because I had to rearrange to fit in the snapshot.

[Zoyo]

Hi
I need some help about rs-232 communication. I want to make a vi witch can do this things:
-read a txt file (to simulate a serial port like when the datas are coming)
-write in a txt file or draw in a diagram (or both)
if anybody can help pls HELP ME because im a beginner in this problem.
I already do something but Im not sure that good.
Thx for all.