Re: Serial Port Problems
On 10/4/2014 10:48 AM, Markos wrote:
> Dear Ethan,
>
> Your scale has a DB9, DB25 or USB connector?
>
> It is important to make sure that the cable you are using has the
> correct pinout.
>
> Your scale has come with a cable from manufacturer or you set up the
> communication cable yourself?
>
> The DB9 serial cable for communication use, in general, only 3 pins, Tx,
> Rx and Gnd. If your instrument follows the standard RS232.
>
The "standard" for RS232 also includes Data Set Ready (DSR), Data
Terminal Ready (DTR), Request To Send (RTS) and Clear To Send (CTS).
Many consumer equipment doesn't use these - but a significant percentage
of commercial equipment does.
Data Carrier Detect (DCE) and Ring Indicate (RI) are also available, but
generally only used in Modems (although some commercial equipment can
use DCE).
> Then you need to know what are the serial communication parameters that
> the scale are using (data bits, parity, stop bit, bps) to be able to
> configure your acquisition program correctly.
>
<snip>
> Any question, email-me,
> Markos
>
Jerry
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