Samsung PE40C Manual page 59

1
Preparations
Ack

Header
0xAA
V.Wall_On : Same as above
Nak

Header
0xAA
"ERR": A code showing what error has occurred
Data
Command
length
ID
0xFF 4
Command
ID
0xFF
Ack/
r-CMD
Nak
'A' 0x89 Wall_Div
Data length Ack/Nak
3 'N'
Val1 Val2
Checksum
Wall_SNo
r-CMD Val1
Checksum
0x89 "ERR"
1 Preparations
59