OPTICAL SYSTEMS DESIGN
DOC ID: 10103502
OSD553 OPERATOR MANUAL
PAGE 7
2.4
OPERATION
2.5
CONTROLS
The OSD553 automatically maintains the output video signal at 1.0
±
0.1Vpp
The OSD553 has the following controls:
LK4, LK3, LK2
Enable the video mute to operate on Channel 1 (Top), 2, 3
(Bottom). If installed the video output is disabled when the
associated “video present indicator” changes from green to red.
LK 7, LK6, LK5
Couple channels 1, 2 and 3 to the alarm relay (if fitted). This is
useful when the unit’s “Alarm” function is required as unused
channels can be disabled by removing the associated link.
LK1
Set to 1 if –12V is available (as is the case when used in an
OSD350 or OSD370 chassis fitted with an OSD911 or OSD922
power supply unit (PSU)) and to 3 if –12V is not available (as is
the case when an OSD921 PSU is used).
2.6
INDICATORS
The OSD553 has only three indicators, one for each channel.
"Video Signal Present"
Green when a video signals is detected
Red when no video signal is detected
Note that this will glow red even if an optical signal is present but there is no video signal
transmitted by the remote transmitter.
