User Manual

Copyright 2012 Page 19
This data can be stored by the camera or external equipment for recording and
subsequent post processing.
A set of additional functions are available to 5I lenses which allow them to receive
an externally generated data string and then append this received data to the normally
generated data stream of the lens before it is sent to the camera. A unit which sends
data to a 5I lens through its external interface is called an “External Data Source Unit”
or EDSU. Operation with an EDSU is described in Section 9. Section 5.4 defines the
commands associated with the EDSU functionality.
4.7.4 Red 18-50mm and 50-150mm Zoom Lenses
Red lenses have a single channel interface for direct communication with a
camera. The start-up baud rate will be 115k2 if an N command is received within one
second. If no N command is received within one second, the speed will drop to 9600
baud and the lens will wait without timeout for an N command. Baud rate can be
adjusted using the Kbn command. All CORE commands described in Sections 5.1
through 5.1.18 are available for Red lenses.
4.7.5 DigiOptical, Angenieux, Fujinon and Sony Lenses
As I Technology partners, DigiOptical, Angenieux, Fujinon and Sony have agreed to
support all CORE I Technology commands. Each manufacturer may also have unique
EXTENDED command features which are considered hidden to the general user.
Depending on the manufacturer, some EXTENDED commands may be available by
request to technicians who service equipment and I Technology developers.
4.8 CORE Command / Response Structure
Communication with a lens is initiated by the Camera or External device and a lens
replies with the requested information and/or to acknowledge the command. The only
exception to this sequence is at Power-Up. A lens will automatically transmit a data
string to each existing channel to indicate a power-up has occurred. The lens will then
wait to receive an N command. The lens must receive the N command as its first
command, after which all other commands are available to the controlling channel(s).
Each command has a specific lens response. A lens will respond with the error
response string: ”? [L/F][C/R]“ to any unrecognized command, unless the Inhibit Errors
command “Ka” has been issued.
Each of the two communication channels on 5I lenses function independently.
S4I lenses send the same response to both channels and can receive commands only
from the controlling channel. For S4I lenses, when power is present on the external