User manual

Imagestore User Manual Installation and Integration
Miranda Technologies Ltd Page 165
Output from GPI
A GPI port may used as an output and its active status, (on), is defined by the
output being internally pulled to ground by a "Darlington" configured
transistor such that an active low will be represented by +0.7V. Lamps or
relays attached to an output GPI may use the GPI +12V supply (pin 8) but the
maximum current drawn from this supply should not exceed 500mA.
Where a GPI output is used to drive a relay coil, reverse voltage protection
diodes should be incorporated in the circuit to protect the Imagestore from
voltage transients.
Connection of LTC
Where linear time code is provided for Imagestore it should conform to
ANSI/SMPTE standard 12M-1995. The input level should be between one
and two volts peak-to-peak.
KYBD and VGA Connections
Hardware interface listings deliberately exclude details of the unit's rear panel
"kybd" and "vga" connectors.
The "kybd" and "vga" connections are solely for use by the Miranda
Technologies Ltd development team and no user functions can be accessed
via these ports. Making any connection to these ports is a high-risk activity
that Miranda Technologies Ltd would strongly advise against.
Set Up Procedures
Selecting the set up option from the front panel "Boot-Up" menu gives access
to the set-up menus. Select set-up and press the enter key.
Successful configuration of an Imagestore requires a clear understanding of
the purpose of each setting. The set-up procedures are each described
following a brief explanation of their purpose, and to this end, GPI inputs,
GPI outputs and faders are dealt with as a group.