Vaddio Canon VC-C50i Programmers - Manual (Page 68)

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13.8 Focus Position Request
Camera Control Command Type 1
Function To return present focus position.
Command 00B1h
Length 1 byte Parameter
Value 0h
Length 4
byte Status
Range Within range to be return by Focus Range Request
Reference
Format of Control Code
d0 d1 d2 d3 d4 d5 d6
Header Device Num Command Parameter End mark
FFh 30h 3Xh 00h B1h 30h EFh
Answer Format
In case of No Error
d0 d1 d2 d3 d4 d5 d6 d7 d8 d9
Header Device Num Error Code Focus Position End mark
FEh 30h 3Xh 30h 30h s0 s1 s2 s3 EFh
⇓
Present position indicates in hexadecimal 4 figures and its ASCII code is Status
value.
Example:
s0 s1 s2 s3
256 ⇒ 0100h ⇒ 30h 31h 30h 30h
In case of Error
d0 d1 d2 d3 d4 d5
Header Device Num Error Code End mark
FEh 30h 3Xh e0 e1 EFh
⇓
Error Flag indicates in 2 figures hexadecimal and returns ASCII code value.
Example: e0 e1
In case of Busy :
00010000B ⇒ 10h ⇒ 31h 30h
In case of Mode Error : 10010000B ⇒ 90h ⇒ 39h 30h
Condition of Error flag to be set
Busy •In process of camera initializing operation by Camera Reset
command, etc.
•In case of executing Preset Move command.
Mode Error •Not in status of Camera ON.
•Not in status of Host Control Mode.