Typographic Conventions; Syntax Of Messages; Messages From Keyboard To Pc - Videotec DCZ Manuel D'instructions

9.2 Typographic conventions

The following typographic conventions are used in
the protocol described below:
• [messages]: Transmitted message
• variable_parameter: Variable parameter
inside a message
• ±: Plus or minus sign.

9.3 Syntax of messages

The messages sent to and from the PC consist in
printable characters (from ASCII 32 to ASCII 127
codes, excluding ASCII 91 and 93) which are delimited
by brackets [ and ]:
• [ (ASCII 91) Open square bracket, STX start of
transmission
• Message text of variable length
• [ (ASCII 93) Closed square bracket, STX start of
transmission
Given the type of messages transmitted and the
quality of the USB communication, no checksum
system is foreseen.
Example: When the ESC
1, column 3) the default keyboard will transmit
[K+13]:
• [: Identifies the start of the message
• K+: Pressed key
• 13: Key lookup value (row 1, column 3)
• ]: Identifies the end of the message.
14
key is pressed (row

9.4 Messages from keyboard to PC

The DCZ keyboard transmits every event to the PC
and does not expect an acknowledge message.
The events are:
EVENT MESSAGE
[K+val]
Pressing of a
touch key.
[K+val:shift]
Pressing of a
touch key +
shift.
[K-val]
Release of a
touch key.
[H+shift]
Pressing a
"shift" key.
[H-shift]
Releasing a
"shift" key.
[J±pp±tt±zz]
Movement of
the joystick.
[S±aa]
Movement of
the shuttle.
[D+1]
Movement of
the jog dial.
[D-1]
Movement of
the jog dial.
Tab. 02
PARAMETERS
val: Value of the
key in the lookup
chart.
val: Value of the
key in the lookup
chart.
shift: Pressed
"shift" keys ('1' . . ' 8').
val: Value of the
key in the lookup
chart.
shift: Number of
"shift" key ('1' . . ' 8').
shift: Number of
"shift" key ('1' . . ' 8').
±pp, ±tt, ±zz:
Pan, tilt, zoom
position -07..+07.
±aa: Rotation
angle -70°..+70°.
Clockwise rotation
by one click (10
clicks per turn
angle).
Counter clockwise
rotation by one
click (10 clicks per
turn angle).