pic16f627 with different baudrates

Hi!

I am a newbee of using PIC USART and internal clock.

I am developing a program that will send a data to an instrument to enable
it to send an output to the PC via RS232.  The problem is, my hardware has
8 channels with different instruments which run with different baudrates.
The data sent is similar on all channels.  How could i send the correct
data to the corresponding channel which i am not sure what baudrate to
use? Is it possible for me to constantly change different baudrates after
i send a data to each channel since different instruments have different
data request. What i am going to do? Do you have any idea. Too, i am using
the inaccurate internal clock since i am running out of ports.

Your response is highly appreciated. Thank you so much. 

rose fay wrote:
> Hi!
> 
> I am a newbee of using PIC USART and internal clock.
> 
> I am developing a program that will send a data to an instrument to enable
> it to send an output to the PC via RS232.  The problem is, my hardware has
> 8 channels with different instruments which run with different baudrates.
> The data sent is similar on all channels.  How could i send the correct
> data to the corresponding channel which i am not sure what baudrate to
> use? Is it possible for me to constantly change different baudrates after
> i send a data to each channel since different instruments have different
> data request. What i am going to do? Do you have any idea. Too, i am using
> the inaccurate internal clock since i am running out of ports.
> 
> Your response is highly appreciated. Thank you so much. 
> 
> 
Yes you can change the baud rate if you know the correct rate for each 
instrument. You will most likely needed a crystal the PIC internal 
oscillator is not accurate enough. You will need a bigger chip or some 
type of I/O expander

On Mon, 08 Oct 2007 04:38:27 -0500, "rose fay" <rf_orcullo@yahoo.com>
wrote:

>Hi!
>
>I am a newbee of using PIC USART and internal clock.
>
>I am developing a program that will send a data to an instrument to enable
>it to send an output to the PC via RS232.  The problem is, my hardware has
>8 channels with different instruments which run with different baudrates.
>The data sent is similar on all channels.  How could i send the correct
>data to the corresponding channel which i am not sure what baudrate to
>use? Is it possible for me to constantly change different baudrates after
>i send a data to each channel since different instruments have different
>data request. What i am going to do? Do you have any idea. Too, i am using
>the inaccurate internal clock since i am running out of ports.

So that's 9 UART channels total, 1 PC plus 8 instruments, and your PIC
has 1 UART and nothing to multiplex that 1 UART.  All that plus an
inaccurate baud clock to boot.

One thing you could do that might pay off would be rethink your
hardware architecture.

-- 
Dan Henry