There may be also a classic fault of 250KHz NOT being quite 250KHz but a little more..... this would send in the first few channels OK after SC and then , gather error as it moves down the line.
Every processor has it's own little quirky way of doing the 250KHz best in only one possible way.
Forexample, in a 89C51 you can do it best with a 16MHz Xtal and using serial port set to Mode 2 with PCON = h00. This will set Baud rate = CLock Frequency / 64 = 250KHz very precisely for DMX transmission. NO other configuration seems to give the right timing
BTW, check your XTAL anyway. They sometimes screw up very innocently.
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