user-programmed device supports a maximum of 10
command slots. There may be other practical
problems with the protocol you are trying to
reproduce that may render custom devices unsuitable.
•
The custom device system was designed to control
VTRs, Video Servers, or Audio Servers. To control
something other than these devices, you can re-use
the existing command-tag names but substitute
different commands. For example, the Play command
tag could be used to cue a camera shot.
•
The commands can be run manually from the
VTR
Remote
menu or recorded into custom controls.
To Program a Custom Device Command
1.
Press
HOME
>
Setup
>
Installation
>
Com
Setup
.
2.
Press
Custom Device
and use the
Custom
knob
to select the custom device (
CUSTOM0
or
CUSTOM1
) that you want to create a command
for.
3.
Press
Modify
.
4.
Use the
Command Tag
knob to select the
command you want to program.
•
SEEK TIMECODE
— sends the clip time as a
packed BCD of the form HHMMSSFF.
•
REWIND
•
FRAME REVERSE
•
PAUSE
•
STOP
•
PLAY
— requires the
Roll Clip
feature to tie
the command to a transition.
•
FRAME ADVANCE
•
FAST FORWARD
•
RECORD
•
FADER POSITION
— not supported at this
time.
•
DIAGNOSTIC 1
— can only be run from a
custom control
•
DIAGNOSTIC 2
— can only be run from a
custom control
•
DIAGNOSTIC 3
— can only be run from a
custom control
5.
Press
Insert Line
to insert a line, or byte, into the
command signal.
6.
Insert a hexadecimal byte into a new line as follows:
a)
Use the
Set Nibble
knob to set a Hexadecimal
value for the first nibble in the byte.
b)
Press
Toggle Nibble
to switch between the
first and second nibble in the byte.
c)
Use the
Set Nibble
knob to set a Hexadecimal
value for the second nibble in the byte.
d)
Press
Insert Line
do add additional bytes to
the signal.
7.
Insert a special command into a new line as follows:
a)
Press
Toggle Special
.
b)
Use the
Command Flag
knob to select the
flag you want to insert or press
Special
Options
and use the knobs to select the flag
you want to insert.
8.
Press
HOME
>
Confirm
.
Special Commands and Parameters
Besides strings of constant Hex values (bytes), commands
can be programmed with special characters and with
converted parameter values. Examples of the special
characters include the two special values to perform a
communications break. The communications break is
formed by a data zero event that extends beyond the
normal data bit length permitted in the serial data word
(for example, serial word length of 8-Odd-1Stop bit is
1+8+1+1 = 11 bits long). The commonly used minimum
length for break is 17 bits long or one and a half to two
data-words. To implement a break in custom devices,
there needs to be a
[Break On]
, a
[Break Off]
, and an
optional delay in between.
Certain commands pass a parameter to the custom device
driver that can be converted into a string of bytes using
a special packed command in place of a single byte. Only
one of these special command lines may appear in any
given command slot (since only one parameter is ever
passed). This command line is converted during runtime
into the specified one to four bytes of parameter data,
and included at that location in the command string. One
command tag that gets a parameter is the Cue to Clip
command. The value passed when a Cue to Clip
command is triggered is the desired cue time as
represented in a packed word timecode format. Typically,
this value must then be converted into some
representation of packed timecode bytes to be sent to the
external device.
Table 10: Packed Command Flags
Function
Special Name
Force the outputs to data low value (for RS-232
data low is a positive voltage).
[Break On]
Release the outputs from a forced data low.
[Break Off]
Insert the checksum byte (currently supports
only simple 8-bit additive checksum).
[Checksum]
Not currently supported.
[Posn X]
62
• Device Control — Acuity Setup Manual (v9.2)
Содержание Acuity 4410AR-020
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