Hi,

I'm working on a project that requires converting unidirectional
data from one baudrate to another. If anyone has ideas on an elegant
and inexpensive way to do this, it would be appreciated.

The converter is for a DMX transmitter. DMX is the standard protocol
used in the entertainment industry for controlling lighting equipment
such as dimmers, colour changers, fog machines, etc. It is electrically
RS-485, and the data is 250kbps.

The crux is that I am interfacing it with an embedded PC using the
RS-232 port which runs at 115.2kbps. Of course there is a bottleneck,
but it's ok because the data being sent is generated less often then
what would be needed to max out the DMX output.

Here are my current thoughts on a solution:

- 2 PICs connected together with either parallel or I2C
- a PIC with 2 UARTs (but the only ones are 64TQFP, not nice to solder)
- a PIC controlling a 16550 UART

Any ideas would be greatly appreciated.


Cheers,

Andrew

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