Compuprint 4051 - Manual (Page 57)

Printer Setups
51
Robust XON
BUFFER CONTROL
↑
ROBUST XON → or ← No (*) ↑ or ↓
↓
Yes ↑ or ↓
HIGH GUARD LEVEL
This function selects the execution of Robust XON.
High Guard Level
ROBUST XON
↑
HIGH GUARD LEVEL → or ← 10% Buffer Size ↑ or ↓
↓
... ↑ or ↓
INTERFACE TYPE
90% Buffer Size (*) ↑ or ↓
Selects the percentage of the input buffer to fix to the High Guard Level signal.