Canon SX 50 - Manual (Page 11)

Projector User Commands
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Response
Transmissions sent from Projector to PC in response to commands from PC.
Transmissionformat
Character strings consisting of one or more ASCII characters.
The first two characters are always :
The first character indicates the response type.
Response type Meaning Example
i State response i:OK i:BUSY etc.
w Warning w:USER_COMMAND..
e Error e:000B INVALID..
g Reference command response g:AVOL=10
r Range request command response r:VKS=N, -50, 50
Delimiters for commands sent from PC.
Type
OK response After processing of each command is completed, a response is sent indicating that the next
command can be received.
:=i:OK
BUSY response
This response is sent when a command cannot be received during processing. Wait for a few
moments, and then try sending the command again.
:=i:BUSY
Example: > IMAGE=2
< i:BUSY
WARN response
This response is sent when warning information is issued.
Note that this command cannot be executed.
:= w:
Example: > IMAGE=2
< w:USER_COMMAND_VERSION_IS_UPDATED
ERR response
An error message is output.
:= e:□
* is expressed as a four-digit hexadecimal number.
* Refer to “Error List”!
Example: > abcdefg
< e:0002 INVALID_COMMAND
GET response Request response for each parameter.
:=g=
Example: > GET LANG or ? LANG
< g:LANG=JPN
RANGE response This is the settable range response for each parameter.
:= r:=,
value range>
* refer to the RANGE command.