Maximum Transfer rate?

[Einly]

Dear all,

I wish to send data from pic to a computer through RS232. Each second, I would like to send 20kBytes of data. May I know how can this transfer rate be achieved? If not, what is the maximum transfer rate be achieved and how to achieve it? Either hardware/ software?
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Einly

[ckielstra]

20kBytes per second equals 200kbits per second including start- and stop-bits.

Depending on the chosen clock speed the hardware UART of the PIC-series goes up to 2500kbaud at 40MHz, so your data throughput is possible.

There are some limitations though:
- At these high baudrates the line length for RS-232 is limited to about a meter.
- The mismatch between the UART baudrate settings and the required baudrate has a maximum allowed error of 4%. This may require less common clock frequencies.

For these amounts of data I would recommend looking into USB which is better equiped to handle these throughputs. Also consider many of the newer laptops are supplied without RS-232 connector.

[asmallri]

Another alternative is to use an ethernet interface running TCP or UDP. Application development is easier and far more portable across operating systems, platforms, and applications than USB.
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Regards, Andrew

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