"we never had this problem before" 

do you know if something wrong with the cable? or some setting wrong in 802D side or in you PC (you call it computer) 

How many cable do you have, is it possible try on other known good system?

What software you use in you PC (computer), why you don't post picture of 802D screen?

Epitome5

Hi we are using CNC 802D , when we are transfering daata from computer to CNC through serial port wire, we never had this problem before, out of no where computer  shows,

"Data Transfer Error" path19200 on CNC machine screen, do anyone know what causes the issue.

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Split from Problem transferring data from Sinumerik 802d to PC and vice versa.