Applies To:
  • CitectSCADA 4.xx, 5.xx
Summary:
Using a Koyo 405 PLC with ccm on COMX. Receiving "Bad or Garbled Response" error messages. The problem is project dependent and does not occur on all ports. The error messages occurs once every few hours on win95. The problem has not been observed on NT 4.0.  

Solution:
The latest version of the COMX driver now writes all available data to the com port in "one go". This should reduce the number of coms errors when sending to devices that are sensitive to message receive timing. 
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