Omron V530-R150E-2 Operation Manual page 218

Error Codes and Countermeasures
Data Matrix
206
(X direction)
1
A margin of 4 or more cells around the code is required.
2
Timing patterns (The cross point between black and white.)
3
The L-shape in the corner is a finder pattern.
4
Parts other than 1 to 3 are data.
Section
(Y direction)
9-2