SATO CL4NX Programming Reference Manual page 218

Data n
FNC1 1BH
ECI 1BH
Aztec code is settable within the range (00H – FFH).
To set 1BH, specify [1BH,1BH]
To set FNC1, specify [1BH, 30H].
To set ECI, specify [1BH, *]. ('*' refer from 31H to 36H.)
Data n+1
30H
30H to 36H
210