Matrix Orbital DD-DB1 LCD/VFD Dev Board - Manual (Page 35)

9. Miscellaneous
9.1.Read Version
Number
Dec
Hex
ASCII
254 54
FE 36
6 ■
Causes display to respond with it's firmware version number.
Response 1 byte, convert to hexadecimal to view major and minor revision numbers
9.2.Read Module
Type
Dec
Hex
ASCII
254 55
FE 37
7 ■
Causes display to respond with it's module number.
Response 1 byte, module number, see partial list below
23 DD-DB1-AL202 24 DD-DB1-AV202 25 DD-DB1-AL204 26 DD-DB1-AV204
33