V
Shutter Control Unit Communications Commands
1 Communication-controlled operation
49
1-4
Communications parameters
Baud rate:
9600 bps (fixed)
Data length: 8 bits (fixed)
Start bits:
1 bit (fixed)
Stop bits:
1 bit (fixed)
Parity check: None
1-5
Communications format
The data format used when the system receives data from external equipment is
referred to as “command format,” while that used when the system sends data is
called “response format.” In the following description, [ ] indicates a delimiter and not
data (characters) that is actually sent or received.
1-5-1
Command format
[A][BBB][C
…
C][CR]
[A]:
Command identifier (one lower-case alphabet character, ASCII code, one byte)
Identifier Description
c
Operation, control, and data setting command
r
Data request command
[BBB]:
Command name (three upper-case alphabet characters, ASCII code, three
bytes)
[C
…
C]:
Parameter (ASCII code)
[CR]:
Carriage return (0x0D)
1-5-2
Response format
[D][BBB][E
…
E][CR][LF]
[D]:
Response identifier
Identifier Description
o
Response given when command processing is normally
terminated
n
Response given if an error occurs during command
processing
a
Response given to r command
[BBB]:
Command name (three upper-case alphabet characters, ASCII code, three
bytes)
[E
…
E]:
Data read or error code (ASCII code)
[CR]:
Carriage return (0x0D),
[LF]:
Line feed (0x0A)
[Error codes]
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