I would like to store my rs232 data into a excel file and graph it using cvi.

[SachaE]

Hi Mark,
Looks like the software is OK. Heres a couple of things to try - the 13 we're sending for the carriage return - try changeing it to a 10. (this is a new line character instead of a carriage return.)

Also, do you have another PC that you can run Hyperterminal on - we need to check that the PC is in fact sending out Data from the serial port. You'll need a serial cable to connect the two machines.(Null Modem cable - i.e. it crosses over the Tx and Rx lines).
Possibly a little easier to do if you have a connector handy is to do a loopback on the serial port so that whatever you send out comes back in - that verifies both sides of your port. (check out the following URL for more info on a
loopback test)
http://digital.ni.com/public.nsf/websearch/e22da85e97818de78625678c0069bfc9?OpenDocument
I think it's a hardware issue somewhere in the system. We need to isolate that first.

S.

[SachaE]

Hi Mark,
another quick thought - you have checked the baud rate setting on the DART? Did the manufacturer / seller provide an example (possibly fully built) program that you can check the communication with?

S.

[SachaE]

Hi Mark,
forgot to say - if you use the hyperterminal method, don't forget to go into the windows settings to change the baud rate / parity etc. of the serial port.

S.

[marktj000]

I am able to check communication with this instrument and a couple other of these instruments with a winwedge software where I tell it to send BAcr and the program will communicate with the software so I know it isn't a hardware problem. When I run the sample program you supplied I tried changing the baud rate, and request command to BBcr for continuous data output and I am unable to see anything disply in the text box. I know that cvi is sending the BAcr because I can hear the instument make a clicking sound from the instruments that the softwar/hardware from the instrument are getting the request to send data out the RS232 but nothing is getting displayed from the CVI program
. Mark

[SachaE]

Hi Mark,
try putting a breakpoint in the code in the Com Callback function. Run it as debug, then you can see if it gets called at all.
S.

[SachaE]

Hi Mark,
just had a though - the data might be there, but if the first character in the buffer is a "\0" (ASCII value 0) then when I try to write to the textbox, it won't write anything.
Try replaceing the code in the com callback function with this

char serialReadData[2048] = "\0";
unsigned char byteRead;
int i;
int inQLength;
inQLength = GetInQLen (1);
for (i=0;i&ltinQLength && i&lt2048;i++)
{
byteRead = ComRdByte (1);
if (byteRead==0)
{
byteRead = 10;
}
serialReadData[i] = byteRead;
}
serialReadData[i+1] = '\0';
SetCtrlVal (panelHandle, PANEL_TEXTBOX, serialReadData);



S.

[marktj000]

Hi SachaE,

I tried inserting the code you provided but the only way I was able to get it to compile and run was by getting rid of the lt in your for statement. I know this instrument does send the NA data cr when I tried it with another software to check the rs232.

[SachaE]

Hi Mark,
ok - idiot hat on me - I was incorrectly setting up the com callback - in fact the original code was removing it!
InstallComCallback (1, LWRS_RECEIVE | LWRS_RXFLAG, 3, 13, ComCBFunc, 0);

OK,
I;ve attached a new set of files - they have a few extra indicators and an extra button to force the serial byte in check. (just in case I've made another mistake - sorry)
The time indicator is a 2 second indicator. If you hit the get data button, it checks the outQLen for up to 2 seconds, stopping once all the data has gone - good check)
If you hit the check port button, it checks the inQlen for either 2 seconds, or a length of 3 b
ytes. If there's 3 or more bytes of data in the inQ, it forces a call to the comcallback function.
If this works, we can strip out some of the checking again.

Fingers crossed.

S.

[marktj000]

Hi SachaE,

I tried running your program but it doesn't work, where you able to get it to compile. It is stating that identifiers for panel time, panel inqlen, and panel outqlen are not found. mark

[SachaE]

Hi Mark,
I just downloaded the files from here, and created a new project - it compiles and links fine for me. Did you make sure you overwrote the .h file?

S.