WILLIAM J LUTTER wrote:
> SUMMARY I'm running SL 5.0 (Boron) with kernel 2.6.18-92.1.22.el5.   I have a
> 15 year old digitizer unit with vanilla 8N1 (8 bits, no parity, one stop bit)
> serial port parameters.
> 
> When I send the unit a status prompt which returns 55 characters, it comes
> back using a c "read(fd,data,80) (read in up to 80 bytes) as 8 bytes per read
> - as if there is an 8 byte buffer associated with the 16550A UART serial
> port.

the 16550 uart has a 16 byte fifo buffer.

if you are using a 'canned' i/o to read/write the 16550, that could be causing
your problems.

i would suggest that you pull http://www.national.com/ds/PC/PC16550D.pdf and
read so that you can write your own i/o to get interface that you want.

hth.


-- 

peace out.

tc,hago.

g
.

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