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118
Appendix —
RS-232C command reference (Presenter)
For information regarding the RS-232C settings, refer to “Using the RS-232C Connector” (p. 95).
■
Command overview
A command consists of an ASCII code sequence containing “
stx
,” two alphabetical characters, and a
semicolon (“;”). The two alphabet characters show the command type. Arguments can be added to the
command and they are separated from the two alphabet characters with a colon (“:”) and multiple
arguments are themselves separated by commas (“,”).
“
stx
”
The ASCII code signal name (code number: 02H (hexadecimal)) and code that signals
the command start.
“
:
”
Code used by Presenter to separate the command and its arguments.
“
;
”
Code used by Presenter to signify the end of a command.
Example 1:
To start playback, send the ASCII command:
stxPL;.
Example 2:
To start the playback of video clip number 2 in palette number 0, send the ASCII
command:
stxPA:0,2;
.
■
About the protocol
Depending on the command, there are three different types of communication protocols.
Specifying an action and making a setting to Presenter
1.
Transmit the command from the control device to Presenter.
2.
If received correctly, Presenter returns ACK; and if an error occurs, Presenter
returns ER.
“
ACK
” is an ASCII code signal name (code number 06H0 the tells the control device that the command
was correctly received).
Querying a Presenter setting
1.
Transmit the command from the control device to Presenter.
2.
If received correctly, Presenter returns the setting as a command; and if an
error occurs, Presenter returns ER.
3.
If the command from Presenter was received correctly, an ACK is returned (this
ACK can be omitted).
*
If an ER command is sent to Presenter, Presenter will resend the command it sent in
step 2
. This can also
be omitted, in which case the procedure must be repeated from
step 1
.)
Having Presenter automatically send commands
1.
Presenter sends a command automatically. Returning an ACK or other
command is not necessary.
RS-232C command reference (Presenter)
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