Read:
T C G 
G A G 
C C A 
Data transmission fine...

Read:
A A A 
C C A 
C C A 
Data transmission fine...

Read:
G A G 
A G G 
G G A 
Data transmission fine...

Read:
A G G 
G C T 
G T C 
Data transmission fine...

Read:
C T G 
A T T 
C G C 
Check code error at position (2, 1)

Read:
T A T 
A T T 
G T A 
Check code error at position (2, 0)

Read:
C C A 
C C A 
C A A 
Check code error at position (2, 0)

Read:
T A G 
C C A 
G A G 
Error in pos: (0,1) ... corrected, new code:
T C G 
C C A 
G A G 

Read:
C C A 
T T A 
G G A 
Data transmission fine...

Read:
G C T 
A T T 
G G A 
Data transmission fine...