Serial Problem

[Ghouly0104]

I am very new to Labview, and am trying to make a VI to control a
laser for a physics experiment via a serial port, and I want to use
Labview to control it. Because I am new I have started by looking at
the basic serial read/write VI that comes with Labview 8.5 in order to
get a grasp on some of the fundamentals. I have used this basic VI to
send commands to the laser, but it only works some of the time. When
it doesn't work I receive an error message consisting of some portion
of the command that I sent, but no the whole command. For example: If
I want to change the current to the laser to 30% of maximum I would
write "current=0.30" to the serial port. When I do this the response
I get back is something like "Error:CURRENT0.30- 67" or
"Error:CURENT=0.3- 67" note that I am inputing "current=0.30" and that
I am not misspelling anything in the input. The laser is sending back
an error that consists of my input minus a few of the characters in
the middle. I am also in contact with the hardware manufacturer, but
I don't know if this is a hardware or software problem. Assuming this
is a Labview problem, I would be forever grateful if someone could
point me in the right direction.

[yenknip]

Have you tried communicating to the device directly with Hyperterminal? - Assuming Windows OS
Has the manufacturer given you a command set (I assume so, as you mention you have got it working occasionally)

[Pnt]

Can you post a simplified sample of your code?

If it works ok with hyper terinal, then it is not a hardware problem. Can you try this?

[Ghouly0104]

On Jul 28, 11:10 am, Pnt <x...@no.email> wrote:
> Can you post a simplified sample of your code?
> If it works ok with hyper terinal, then it is not a hardware problem. Can you try this?

The VI I am using can be found here:
ftp://ftp.ni.com/pub/devzone/epd/basic_serial_write_and_read.vi

and in the write section I input (for example) "current=0.30\r".

If I have Hyperterminal, I doubt I have access to it (school computer,
and I don't have administrative access), so I can't try it that way
until I can get an admin in here, which I will try to do soon.