voltage signal thru 9 pin serial?

[drrh]

Can Labview 5.0 read a small volatge signal out of the 9 pin serial connector in the back of the PC? how can I configure it to do so?

[markwysong]

I think we'll need a little more information.

Do you have a DAQ card? With what will you read this voltage?

Mark

[Al_S]

Do you want to determine if the pin is high or low or do you want to measure the voltage?
If you just want to get whether a pin is high of low, you can use VISA VIs (and the UART internal to your PC) and a property node reading the Modem Line Settings property. See some of the serial VI examples that ship with LabView.
If you want to measure the voltage, you need some DAQ hardware. A voltage measurement is a hardware thing, not just a software thing.

[drrh]

hi,

I have a keithly 2700 multimeter/DA box reading temp and can send out both temp and corresponding volatage (in mV range) via RS232. signal goes from RS232 to the PC's 9 pin serial where I am hoping to read it directly via LabView.

also, should I display this signal as a waveform?.

thanx

[drrh]

hi,

I have a keithly 2700 multimeter/DA box reading temp and can send out both temp and corresponding volatage (in mV range) via RS232. signal goes from RS232 to the PC's 9 pin serial where I am hoping to read it directly via LabView.


also, should I display this signal as a waveform in Labview?

[Dennis_Knutson]

You instrument probably sends a string representing the measured voltage and temperature over the serial port. LabVIEW is more than capable of communicating with serial instruments. I couldn't find a driver for the instrument at NI's site but I Keithley has both an IVI driver and traditional LabVIEW driver here. Download the one you want. It's up to you how you want to display the data. If you periodically poll the instrument and want to display the values over time, then yes a chart or graph would work well.

[nicola]

Hi,
I have a 2700 and i suppose you want read a temp with PC via RS232?
The cable is directly connection (TX-TX RX-RX GND)
Select remote in the front panel and select the coreect protocol form.
With the ascii code and VISA (SEE MANUAL)you can read the measurement of TEMP.
Note :if you want control the level state of pin you can utilize PORT IO in the advanced menu of function palette.

See the Vi attached for example

Best regard