Contemporary Research
10
232-STS Stereo S-Video TV Tuner
General RS-232 Commands
S7=
Set audio mode
0=Mono/Mono, 1=Stereo, 2=Mono/SAP, 3= SAP/SAP
S8=
Set bass gain level (0-19)
See Bass Level chart on page 6
S9=
Set treble gain level (0-8)
See Treble Level chart on page 6
SQ
Request Q Mode status
Unit sends “Q” Mode status string
SS
Request Front Panel status
Unit sends “S” Front Panel status string
ST
Request Channel status
Example:
‘>ST’
Unit sends “T” Channel/Source status string
Returns Channel/Source status response string
SV
Request A/V status
Unit sends “V” Audio status string
TR=
Set Tune Ring (TR)
Example:
‘
>2TR=2,4,7-10’
Limits access to specified channels, 120 chars max
Stores unit#2 Tune Ring as 2,4,7,8,9,10
TT=
Select tuned channel
Example:
‘
>TT=28’
0=video mute, 255=mute off, does not change audio level
126=External AV Inputs
Selects channel 28 only if 28 is present in current TR
TC=
Force tuned channel
Example:
‘
>TC=39’
0=video mute, 255=mute off, does not change audio level
126=External AV Inputs
Selects channel 39 regardless of current TR
TP
Set to previous channel
Selects previous channel only if present in current TR
TU
Tune channel up
Example:
‘
>3TU’
Selects next higher channel in stored Tune Ring
Bumps Unit#3 tuned channel up one from available Tune Ring
TD
Tune channel down
Selects next lower channel in stored Tune Ring
XT
Toggle Mute A/V
Alternates Mute A/V on and off
XX
Mute A/V off
Turn A/V outputs on at previous level
XM
Mute A/V on
Example:
‘>XM’
Mutes A/V outputs
Mutes audio and video outputs
P0
Power Off
Same as XM
P1
Power On
Same as XX
PT
Power Toggle
Same as XT
VU
Ramp volume up
Starts volume ramping up
VD
Ramp volume down
Starts volume ramping down
VL
Ramps volume to level (0 – 63)
Sets volume to specific level
VX
Volume Mute off
Restores audio volume to previous level
VV
Stop volume ramp
Stops volume ramping
VT
Toggle Volume Mute
Alternates audio mute on and off
VM
Volume Mute on
Example:
‘
>VM’
Turns off audio outputs
Mutes audio outputs
A carriage return is required at the end of each command and is assumed in all examples. The ‘=’ sign for parameters may
be omitted if desired, though it is helpful for clarity in checking programming.
Working with A/V Detectors and Status
The 232-STS has two active A/V sensors, the audio sensor detects if the station in broadcasting in stereo or mono, and
the video sensor looks for presence of video. If you desire, your control system can respond whenever the status of
the audio or video detectors change. For example, you can change the text of a button to MONO or STEREO by
tracking the Audio Status Response (V), shown on page 13. In the same way, you can light up a NO VIDEO button,
when the Channel/Source Response (T) indicates a video loss.
If you use AV detector status, it’s important to understand how the functions will operate in the real world. When you
change from a stereo channel to a mono broadcast, the V string will first show the audio status as stereo. When the
audio detector locks in, the status will be sent again, indicating mono audio. This is similar to the stereo/mono
indicator and “blue screen” functions on your TV, there may be a little delay, and the function may switch back and
forth a couple times for marginal stations. So expect that the detectors may send the string a few times as well,
depending on signal quality.
As most applications aren’t tracking the A/V sensors, the tuner is normally set not to send a response string whenever
the detectors sense a change. You can turn on one or both functions using the Q3 command on page 9.
