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Lock the caption keyers off when you want to guarantee pass through of
existing line 21 closed caption information that is already on the program
material. See section 3.5.2 for information on controlling the bypass relay.
OPERATION
Models 8084/8084AD/8085 Closed Caption Encoder Manual
3.1.2 Caption Keyer Control Group
The 8084AD, 8085 and later 8084 caption encoder models have separate
Field 1 and Field 2 caption keyer enable buttons (see section 3.1.2.1). The
earlier 8084 encoders have a single global Caption On/Off button, which
controls both Field 1 and Field 2 caption keyers (see section 3.1.2.2).
These controls are also used to "lock" the caption keyers. When the keyers
are locked, neither the keyer control buttons nor software controls can
change the state of the keyers. If the user attempts to turn a keyer on or off
while the keyers are locked, the front panel will briefly display KEYERS
LOCKED.
Even when the keyers are turned off, EDH packet checksum correction is
still performed on the SDI video, and composite video level adjustment is
performed where applicable.
3.1.2.1 Keyer Control on 8084AD, 8085 and later 8084
Encoders
KEYER FLD 1 Toggles the Field 1 caption keyer on or off. When the
keyer is off, the device will merely clock the video through its
internal registers and route it to the video output. The Fld 1
LED indicates if the Field 1 keyer is enabled or not. Software
commands received by the 8084(AD) may also turn the keyer
on or off.
KEYER FLD 2 Toggles the Field 2 caption keyer on or off. When the
keyer is off, the device will merely clock the video through its
internal registers and route it to the video output. The Fld 2
LED indicates if the Field 2 keyer is enabled or not. Software
commands received by the 8084(AD) may also turn the keyer
on or off.
SHIFT + KEYER FLD 1
SHIFT + KEYER FLD 2 Either of these key combinations will lock both
Field 1 and Field 2 caption keyers in their current position.
Software commands received via the serial ports will not change
the keyer settings when they are in the locked mode.
Revision 1.6.6
Page 3-5
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