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4-5IN1404XT Video Scaler and Switcher • Programmer’s Guide
Command/Response Table for RS-232 Commands
Command ASCII Command Response Additional description
(host to scaler) (scaler to host)
Input selection
Select a video and audio input [CH
X1
] [OK] Select video and audio input
X1
.
Example: [CH3] [OK] Select video and audio input 3.
View input video selection [CH?] [
X1
] Video input
X1
selected.
The CH? command code views the selected video input only. There is no
corresponding view audio input command.
Select a video input [CHV
X1
] [OK] Select video input
X1
.
Select an audio input [CHA
X1
] [OK] Select audio input
X1
.
Autoswitch mode
Autoswitch mode on [AS1] [OK] Scaler autoswitches to the
highest numbered input with an
active input. If no inputs are
active, input 1 is selected.
Manual input selection is not available, neither on the front panel nor via
RS-232 control.
Autoswitch mode off [AS0] [OK] Autoswitch mode off.
View autoswitch mode [AS?] [
X2
] View autoswitch mode status.
Seamless switch mode
1. Input 4 must be configured as passive. Turning seamless switch mode on
automatically configures input 4 as passive if necessary.
2. Turning seamless switch mode off does not reconfigure input 4.
3. When seamless switching is on; and you switch to input 1, 2, or 3; that
input is synced to the input 4 reference. The synced input 1, 2, or 3 is
termed the “channel in common”. Seamless switching only occurs
between the passive channel 4 input and the channel in common input.
Switching between input 4 and a non-common in channel input occurs
during the vertical interval of input 4. There is a slight delay without
blanking while the new input syncs to input 4 and becomes the new
channel in common input.
When you switch between two scaled inputs without going through input
4, the switch is not seamless. A brief blanking interval is seen on the
output.
Seamless mode on [SM1] [OK] Turn seamless mode on (and
configure input 4 as passive, if
necessary).
Seamless mode off [SM0] [OK] Turn seamless mode off.
View seamless mode [SM?] [
X2
] View seamless mode status.
Blue screen and video blank
Blue screen on [BLANK3] [OK] Set the video output to blue.
Blue screen off [BLANK2] [OK] Set the video output to either the
selected input 1 through 4 or the
blank screen (if enabled).
Video blank on [BLANK1] [OK] Set the video output to blank.
Video blank off [BLANK0] [OK] Set the video output to either the
selected input 1 through 4 or the
blue screen (if enabled).