Canon VC-C50i/VC-C50iR Programmer's Manual page 148

Answer Format
No Error
d0 d1
Header Device Num
FEh 30h
The operation status (16 bit) indicating the camera internal status is expressed as
a four-digit hexadecimal number with the ASCII code returned as the status
value.
Example:
Generated Error
d0 d1
Header Device Num
FEh 30h
Error Flag indicates in 2 figures hexadecimal and returns ASCII code value.
Example:
Parameter Error :
Mode Error :
Conditions for setting of error flag
Parameter Error •The designated parameter is an invalid value.
Mode Error •Not in status of Camera ON.
•Not in status of Host Control Mode.
d2 d3
Error Code
3Xh 30h
d5
s0
⇓
s0
b15 b14 b13 b12
1 1 1 1
"F"
⇓
46h
s2
b7 b6 b5 b4
1 0 0 0
"8"
⇓
38h
d2 d3
Error Code
3Xh e0
⇓
01010000B ⇒ 50h ⇒ 35h 30h
10010000B ⇒ 90h ⇒ 39h 30h
d4
30h
d6 d7
Status
s1 s2
s1
b11 b10 b9 b8
1 1 1
"F"
⇓
46h
s3
b3 b2 b1
0 0 0
"0"
⇓
30h
d4 d5
End mark
e1 EFh
147
d8 d9
End mark
s3 EFh
1
b0
0
e0 e1