Hi Greg,
Thanks for the 411. I figured out the problem (the cables).
*peace*
-DG
In article <37FF3D26.A4035DF8@austin.rr.com>,
GMCKASKLE@austin.rr.com wrote:
> > Do I need a DAQ board to read data off a serial port?
> >
> > I have Labview 5.0, 16550 UART (COM 1) and I'm getting data off a
RS-232
> > Port. The data is weak (in the 10s of microvolts).
> >
>
> In general, no, you just use the serial functions in
> either VISA or the serial port to read the logical
> value of the serial port. The bit collecting, parity,
> and handshaking business are taken care of by the
> HW and serial driver.
>
> With values this low, they will all be below the
> threshold voltage and no data will arrive. If the
> signal is a logical serial signal that is th
is weak
> because of distance or poor cabling, then it would
> be best to fix the cabling or whatever. Amplifying
> the signal would just amplify whatever noise exists,
> and the signal would be a mess.
>
> To answer the original question, though -- yes, a
> DAQ board can measure this if the board can apply
> a gain or if you preamplify it.
>
> Greg McKaskle
>
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