WEIGL ProCommander LX Instruction Manual page 66

DMX-Read in
Both values will be compared and the highest value will be
transferred into the output-signal.
Merge Change:

The value which had been changed as latest will be taken.
Merge Add:

Both values will be added and the sum will be transferred
into the output-signal. The output value will be limited to the
maximum value 225.
Merge Combine:

Within the merge range only the external signal will be
transferred to the output signal.
Merge Show Priority:

66
As long as a show runs from the card the intern generated
DMX-signal will be outputted. After the end of show, the
external signal takes over and defines the content of the merge
range.