Grass Valley Turbo iDDR v.2.3 - Manual (Page 294)

294 Turbo iDDR User Guide
Appendix C Specifications
RS-422 specification
The RS-422 interface conforms to ANSI/SMPTE 207M-1997 standard
(SMPTE 422).
GPI I/O specifications
IEEE 1394A interface specification
The following table describes the input requirements for the optional IEEE 1394A
interface.
LTC Transmitter LTC transmitter outputs LTC at the nominal frame rate for the selected
standard at 1x speed, forward direction only.
Characteristics Description
Number of Inputs/Outputs 6 inputs; 6 outputs; 1 common ground
Connector type 15pin D
GPI Input Inputs set to TTL level high = 2.4-5V
External current sink = 1ma
(Compatible with 5 volts CMOS/TTL open collector, or
contact closures.)
GPI Output Outputs are open drain drivers.
Max. voltage when outputs are open = 30V
Max. current when outputs are closed = 100ma
Typical risetimes approximately 625ns
Typical falltimes approximately 400ns
Characteristics Description
Standard IEEE 1394A for import of video and audio from a digital
recording device.
NOTE: The iDDR record channel transport controls can
be used to control the remote device– play, stop, fast
forward, rewind, goto timecode.
Port Assignments Any of the ports 1-3 can be used for making a connection to
a IEEE 1394 device.
NOTE: The top port on the rear panel and the front panel
port are electrically the same. Use only one port at a
time.
Video Requirements DV – DV25 video
HDV – MPEG-2 MP@H14L
Audio Channels 2 channels, 16 bit, 48KHz
Timecode Device timecode input is not recorded. Instead, the clip
timecode is striped using the iDDR record channel internal
timecode generator. Start timecode is automatically set to
00:00:00:00.
Parameter Specification