120
RS-232C command reference (Presenter)
For information regarding the RS-232C settings, refer to “Using the RS-232C Connector”
(p. 101).
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.
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