Hall Research Technologies VSA-X21 User manual

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User’s Manual
VSA-X21
HDMI Audio Extractor with 50 Watt Audio
Amplifier, HDBT Input, Line Audio Input
RS-232 Ports and IP Control
(Telnet & Internal Web GUI)
UMA1234 Rev A

Table of Contents
1.0 INTRODUCTION...............................................................................................2
2.0 FEATURES ......................................................................................................3
2.1PACKAGE CONTENTS .......................................................................................3
3.0 SETUP.............................................................................................................4
3.1INSTALLATION .................................................................................................4
4.0 OPERATION ....................................................................................................5
4.1FRONT PANEL.................................................................................................5
4.2REAR PANEL...................................................................................................7
4.3FACTORY DEFAULT ..........................................................................................8
4.4POWER CONNECTION.......................................................................................8
4.5LINEINCONNECTION......................................................................................9
4.6L/RSPEAKER CONNECTIONS...........................................................................10
5.0 SERIAL COMMANDS .....................................................................................11
5.1SERIAL CONNECTIONS.................................................................................... 11
5.2AUTO DETECTION..........................................................................................18
5.3DEVICE ADDRESSING .....................................................................................18
6.0 WEBGUI AND TELNET OPERATION...............................................................20
6.1AUTO DETECTION..........................................................................................20
6.2INPUT SELECT...............................................................................................20
6.3AUDIO MIX ...................................................................................................20
6.4VOLUME CONTROL.........................................................................................20
6.5LOCATING THE DEVICE ON A COMPATIBLE LANNETWORK...................................... 21
6.5TELNET........................................................................................................21
7.0 SENSE FUNCTIONALITY................................................................................21
7.1PAGESENSOR ..........................................................................................21
7.2PAGE SENSOR INSTALLATION...........................................................................22
7.2PAGE MUTE ON CONTACT CLOSURE..................................................................22
8.0 DUCKING AND AUTOMUTE FUNCTIONALITY ................................................22
8.2AUTO MUTING...............................................................................................22
9.0 TROUBLESHOOTING.....................................................................................23
10.0 SPECIFICATIONS.........................................................................................24
TRADEMARKS USED IN THIS MANUAL
Hall Research and its logo are trademarks of Hall Research. Any other trademarks mentioned in this
manual are acknowledged as the property of the trademark owners.
FCC RADIO FREQUENCY INTERFERENCE STATEMENT
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
1. This device may not cause harmful interference, and
2. This device must accept any interference received, including interference that may cause undesired
operation

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1.0 Introduction
The VSA-X21 is a 4K HDMI Audio Extractor with built-in 50 watt audio amplifier for direct
connection of 8 ohm speakers. It provides an additional line-level stereo audio input that
can mix with the HDMI audio. Volume can be controlled using front panel buttons, RS-
232 commands, WebGUI, Telnet, or via an external rotary digital encoder.
The VSA-X21 provides an independent RS-232 output port that can control other
devices. Typically, to control the power on/off state of the TV or video projector
connected to its HDMI output.
Full EDID management provided allows the user to learn, download, upload, emulate or
pass-thru the EDID from the connected display. Use the USB port on the front panel to
configure the device operation via a free Windows™ GUI available from the VSA-X21
product webpage on http://www.hallresearch.com.
The VSA-X21 can pass through commands from its RS-232 input to the RS-232 output,
but also supports store user-defined commands for controlling devices connected to its
RS-232 output.
The stored RS-232 commands can be triggered automatically (based on detecting +5V
or a HDMI input signal) or manually by user command (RS-232, Telnet or WebGUI),
button press or contact closure.
The device is IP enabled giving the user the ability to control the device through a PC or
Smartphone. The Telnet control uses the same commands as the serial interface.
Figure 1 – Connection Diagram

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2.0 Features
4K HDMI audio extractor with EDID management
Built-in 50 watt amplifier for connection to 8 Ohm speakers (25 watts/channel)
Audio input for connecting line-level audio inputs (e.g. wireless microphones).
Control via, front panel, RS-232, digital pot (rotary encoder), Webpage or Telnet
HDMI Ducking (when Line input is detected, HDMI sound volume in the mix is
automatically lowered)
Primary RS-232 port for device control
Secondary RS-232 port for auxiliary device control
Store separate commands for the auxiliary devices
HDMI and HDBT Inputs
Compatible with X21-UI
Compatible with UHBX-SW3-WP or UHBX-SW3-S
Compatible with UI-KNOB-DP
Supports HDMI, DVI, HDCP, 3D and Deep color
Stereo or Mono output
Priority Paging Sensor input (for automatically muting the audio output)
Compact, Rugged, Reliable, and Economical
Made in the USA
2.1 Package Contents
Qty (1) VSA-X21
Qty (1) 48V DC Universal DC Power Adapter
Qty (1) User’s Manual
Qty (1) Type A to Mini-B USB cable
Qty (1) 4 Position Screw Terminal Strip
Qty (1) 9 Position Screw Terminal Strip

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3.0 Setup
3.1 Installation
Connect an HDMI compatible source signal to the HDMI IN connector.
Optionally, connect the HDMI display device to the HDMI OUT connector. A
display device is NOT required for audio only applications.
Connect 8-ohm loudspeakers to the speaker output screw terminals. For
connecting more than two speakers, please see Section 4.6 L/R Speaker
Connections.
Optionally, connect a compatible line-level audio source to the LINE IN
connector. (e.g., wireless microphone or MP3 player)
Optionally, connect a compatible line-level audio output device to the LINE
OUT connector. (e.g., headphones, assistive listening devices). The Line out
signal volume is variable and is set by adjusting output volume
Optionally, connect a compatible RS-232 control device to the RS-232 IN 3-pin
terminal connector. (e.g., Serial Controller)
Optionally, connect the compatible RS-232 device to be controlled to the RS-
232 OUT 3-pin terminal connector. (e.g., Projector or LCD)
Optionally, connect to your compatible LAN using a CAT5e/6 cable plugged to
the LAN connector.
Optionally, connect one of the following functions to the configurable pins on
the rear terminal strip.
The mode in which these pins operate is set using the free
Windows GUI available on product's website.
oExternal digital rotary encoder
(Compatible with Model UI-KNOB-DP)
oPriority Page Sensor (for detecting page announcement)
oOccupancy Detector (to trigger the unit to send out serial
commands to the display).
See section 4.2 Rear Panel for details.

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4.0 Operation
The following is a functional block diagram of the audio routing in the VSA-X21:
Figure 2 – Audio Routing and Processing Diagram
4.1 Front Panel
Figure 3 - Front Panel
MUTE
Press this button to mute the output audio. When the unit is muted, the LED glows.
▲& ▼
Press these buttons to increase or decrease the output volume. Volume can be adjusted
regardless of mute status. If volume is changed when the output is muted, it will be at the
new level when un-muted.
LED Volume Bar
The illuminated LEDs show the current audio setting 0 to 100%. The level is adjusted
using the ▲& ▼buttons, RS-232, Windows GUI, WebGUI or Telnet.
NOTE Volume setting affects both the Speaker output as well as the 3.5mm
stereo output. The volume of the audio embedded in the HDMI output is
not affected.

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Audio Mix Buttons
The LINE and HDMI buttons are used to select audio inputs. When both are selected, the
audio from each source is mixed together.
LINE
Press this button to select the Line input and add it to the output audio. When
the Line input is selected, the LED glows.
HDMI
Press this button to select the audio embedded in the HDMI input and add it to
the output audio. When the HDMI input is selected, the LED glows.
Using the HDMI ARC audio
Instead of using the audio from the HDMI input, the user can use the audio signal
returning from the TV connected to the output (TV must support ARC function). To
reassign the HDMI audio from INPUT to ARC, use the free Windows GUI available for
free download on the product's website.
When configured to use ARC, selecting the HDMI button on the front panel lights both
HDMI and ARC LEDs at the same time. This indicates the ARC pin in the HDMI is being
selected.
VIDEO SEL
The VIDEO SEL button selects the desired video input.
HDBT LED
When the HDBT IN connector on the rear panel is the active video input, the
RED HDBT LED is on.
HDMI LED
When the HDMI IN connector on the rear panel is the active video input, the
GREEN HDMI LED is on.
AUTO LED
When the AUTO LED is on when AUTO MODE has been activated. This
means the VSA-X21 can switch to an active INPUT and optionally transmit RS-
232 ON and OFF strings to an external device (like a projector or LCD).
The following methods are available for triggering AUTO MODE:
+5V from SOURCE on HDMI IN or HDBT IN connectors
VIDEO from the SOURCE on HDMI IN or HDBT IN connectors
Contact Closure between CCW and GND terminals
NOTE If nothing is connected to the 3.5mm audio input, it is recommended to
deselect the LINE in the audio mix. This eliminates any possible residual
noise picked up by the analog circuits connected to the unused LINE
input

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USB
Connect the supplied USB cable to a compatible Windows™ PC using for use with the
Software GUI available for download from http://www.hallresearch.com.
4.2 Rear Panel
Figure 3 – Rear Panel
HDMI IN
Connect the HDMI connector to a compatible video source. (e.g., such as a DVD or Blu-
ray player).
LINE IN
Connect the 3.5mm jack to compatible line level audio source. (e.g., such as a MP3 or
Microphone).
HDMI OUT (HDMI Connector)
Connect the HDMI connector to a compatible video sink. (e.g., such as a LCD or
Projector).
LINE OUT
Connect the 3.5mm connector to compatible line level audio output devices (e.g., such
as headphones)
L/R 2-Channel Output
Connect 8-16 ohm speakers to the 4-position terminal strip. Observe speaker polarity.
25 watts per channel maximum.
NOT
E
The Line input is configured for nominal Consumer Level
(typical of MP3 players or wireless microphone receivers).
This input connector is stereo (Tip=Left channel, Ring=Right
Channel). Care must be taken when connecting to a mono signal
or a balanced signal.
Refer to Section 4.5 LINE IN Connection below

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VOL Control / PAGE Sense Terminals
These 3 terminal strip connections have different purposes based on the system
configuration.
For VOLUME Control
Connect a compatible rotary encoder (Model UI-KNOB-DP) to the CW, CCW
and GND terminals for system volume control. (Factory Default)
OR for PAGE Sensing and Audio Muting
Connect a compatible PAGE SENSOR (Model VSA-PGSNS) to the CW and
CCW terminals for automated PAGE Muting control.
OR for switch controlled Audio Muting
Connect a SPST switch between the CW and GND terminals for automated
PAGE Muting control.
AND, optionally, connect a switch between the CCW and GND terminals for
automated transmission of the user programmed RS-232 ON and OFF strings
associated with the ‘AUTO’ function from the RS-232 OUT terminals.
VOL Control
Connect a rotary encoder (Model UI-KNOB-DP) to the 3-pin terminal for controlling the
volume or a sensor for page control.
RS-232 IN
Connect the PC’s RS-232 port to the input of the unit with a 3-pin terminal connector.
RS-232 OUT
Connect RS-232 out to the controlled device such as a projector using a 3-pin terminal
cable.
LAN
Connect to the compatible LAN network.
DC PWR
Connect to the power supply shipped with the unit.
See Section 4.4 Power Connection.
4.3 Factory Default
Hold the ‘Auto’ and ‘Mute’ buttons for more than 4 seconds to reset the unit to the
‘FACTORY DEFAULT’ state.
4.4 Power Connection
A 120/240 VAC 50/60 HZ to 48 Volt DC 1.5A external universal power supply provides all
the power required for the system to operate.

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4.5 LINE IN Connection
NOTE
The LINE IN connection expects a line level signal (maximum of ~0.9 vDC), so you
may need an external preamp for low-level dynamic microphones, the Hall Research
HR-101-S may work for your needs.
In most K-12 installations, the wireless (RF or IR based) microphones used have a
line-level output.
Most condenser and some Dynamic microphones may work without external
preamps if you turn up the microphone volume on that microphone system.
Use the following diagram for connection of external preamp (such as wireless
microphone receiver) to the system.
Ground referenced means that the external preamp has a connection to ground (the
AC cord has a ground prong).
If the preamp does not provide a balanced (differential) output, you should not tie the
return of your source to the ground of the VSA-X21. Doing so would create a ground
loop that will most likely cause audio hum.
If you are sure that your external preamp is floating (its AC cord has no ground
prong), then it may be advisable to connect the negative input signal to ground at the
VSA-X21.
TIP, RING and SLEEVE refer to the LINE IN 3.5mm connector

HDMI Audio Extractor with Power Amplifier
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4.6 L/R Speaker Connections
NOTE
The audio amplifier is designed to drive loads equal to or greater than 8 Ω
Using lower loads may cause an over-current shutdown of the audio amplifier, this
will be detected and the amplifier will be reset.
Audio output from the amplifier will mute during this time.
It is recommended that when using a single speaker for each side to use 8 or 16
Ωspeakers.
The amp can drive 50 watts total (25 watts per channel) when using 8 Ω
speakers, which may be loud for a small room. Using 16 Ωspeakers will cut the
power delivered by half.
To drive 2 speakers from each side (total of 4 speakers in the room), connect two
16 Ωspeakers in parallel or two 4Ωor 8 Ωspeakers in series as shown below.
Never connect two 8-Ωspeakers in parallel.
Figure 6 – Speaker Connection Example

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5.0 Serial Commands
The following table lists the RS-232 commands:
oA single carriage return character (0x0D) must terminate each command.
oInvalid input, spaces and line feeds characters (0x0A) are ignored.
RS-232 communication on the RS-232 IN terminal strip is:
o9600 bps, 8 Bit, No Parity, 1 Stop bit.
RS-232 communication on the RS-232 OUT terminal strip is:
oConfigurable, factory default is 9600 bps, 8 Bit, No Parity, 1 Stop bit.
oThe OUTPUT baud rate can be changed via Software GUI or via the “XBx”
and “XPx” commands.
<CR> in the table below refers to a single carriage return character (0x0D)
“Error – Invalid Command” is sent in response to invalid RS-232 commands
“Error” is sent in response to invalid command parameters
5.1 Serial Connections
(3) Screw Terminal - RS-232 IN (TX, GND andRX)
(3) Screw Terminal - RS-232 OUT (TX, GND and RX)
Command Response Function and Example
FW FWx.y<CR> Current firmware version.
X and Y represent the firmware version numbers.
(e.g., FW1.1<CR>)
PWx
PWx<CR> Controls power status.
PW?<CR> – Query current power setting
PW1<CR> -- Turn power on
PW0<CR> -- Turn power off (Factory Default)
LRx
LRx Controls Line Level Audio Input LR?<CR> – Query current Line Level Audio setting
LR1<CR> -- Turn on Line Level Audio (Factory Default)
LR0<CR> -- Turn off Line Level Audio
HDx
HDx<CR> Controls HDMI Audio Input
HD?<CR> – Query current HDMI Audio setting
HD2<CR> -- Turn on ARC Audio (valid in ARC Mode –
AR1)
HD1<CR> -- Turn on HDMI Audio (Factory Default)
HD0<CR> -- Turn off HDMI Audio
VOLxxx VOLxxx<CR> Controls Audio output level. Allowable range is 0 to 100%.
VOL?<CR> – Query current volume level
VOL50<CR> -- Set volume level to 50%
VOL0<CR> -- Set volume level to 0% (Factory Default)
VUPxxx VOLxx<CR> Controls Audio output level. Optional range is 0 to 100%.
VUP<CR> -- Adjust volume level up 2%
VUP10<CR> -- Adjust volume level up 10%

HDMI Audio Extractor with Power Amplifier
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Command Response Function and Example
VDNxx
VOLxx<CR> Controls Audio output level. Optional range is 0 to 100%.
VDN<CR> – Adjust volume level down 2%
VDN10<CR> – Adjust volume level down 10%
VCx VCx<CR> Controls current volume control setting
VC?<CR> – Query current volume control setting
VC1<CR> – Line Input (defaulted to 70%)
VC2<CR> – HDMI/ARC Input
VC3<CR> –
Both LINE and HDMI/ARC Inputs together
(Factory Default)
Note:
It is recommended that the user always return the setting
to VC3 (default) if they have changed to another setting
(VC1 or VC2).
This is so volume adjustments are set for both the LINE
and HDMI/ARC together and not just one.
For example:
To set the LINE Input to 50% Volume and then reset the
control to the default LINE+HDMI/ARC, use:
VC0<CR>VOL50<CR>VC3<CR>
MUTx
MUTx<CR> Controls the MUTE status
MUT?<CR> – Query current Mute Setting
MUT1<CR> – Turn on Audio Muting
MUT0<CR> – Turn off Audio Muting (Factory Default)
ARx
ARx<CR> Controls ARC Mode (Audio Return Channel)
AR?<CR> – Query current ARC mode setting
AR1<CR> – Turn on ARC Mode
AR0<CR> – Turn off ARC Mode (Factory Default)
When ARC mode is turned off, using the HDMI
button on the front panel will toggle between HDMI
audio and no HDMI audio.
When ARC mode is turned on, using the HDMI
button on the front panel will toggle between ARC
Audio and No ARC Audio.
AUx
AUx<CR> Controls AUTO DETECT Mode
AU?<CR> – Query current Auto Detect Mode Status
AU1<CR> – Auto Detect Mode Active
AU0<CR> – Auto Detect Mode inactive (Factory Default)
EDx EDx<CR> Controls EDID mode setting
ED?<CR> – Query current Mute Setting
ED1<CR> – Pass-Thru (Factory Default)
ED0<CR> – Emulated
FD FD<CR> Resets device to Factory Defaults
Unit will reboot

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Command Response Function and Example
MOx
MOx<CR> Controls the MONO/STEREO Status
MO?<CR> – Query current MONO/Stereo Setting
MO1<CR> – Turn on MONO
MO0<CR> – Turn off MONO (Stereo) (Factory Default)
FPx
FPx<CR> Controls the Front Panel Lock Status
FP?<CR> – Query current Front Panel Lock Setting
FP1<CR> – Turn on Front Panel Lock
FP0<CR> – Turn off Front Panel Lock (Factory Default)
ST System status Queries system status
ST<CR> – Query the current system status
Current Status for the commands below:
FW?, IP?, SB?, GW?, PW?, LR?, HD?, MUT?, VOL?,
MO?, VC?, AU?, AT?, AR?, BS?, BE?, BT?, ED?,
DA?, XC?, XB?, XP?
XBx
XBx<CR> Controls the RS-232 Out Baud Rate
XB?<CR> – Query current Output Baud Rate Setting
XB4<CR> – Set Baud Rate to 9600 (Factory Default)
The baud rate can be set to any of the following:
XB1 = 1200, XB2 = 2400, XB3 = 4800
XB4 = 9600, XB5 = 19200, XB6 = 38400
XB7 = 57600, XB8 = 115200
XPx
XPx<CR> Controls the RS-232 Out Parity
XP?<CR> – Query current Output Parity Setting
XP0<CR> – Set Parity to ‘NONE’ (Factory Default)
XP1<CR> – Set Parity to ‘EVEN’
XP2<CR> – Set Parity to ‘ODD’
XT
XT<CR> Transmit from RS-232 OUT with specific baud and parity
Terminated with <0x17><0x0D>
XR
Up to 128 bytes received
on RS-232 OUT RX line Reads characters received on the RS-232 OUT RX
terminal.
128 characters maximum
IP? or |IPx IPxxx.xxx.xxx.xxx<CR> Controls IP Address setting
IP?<CR> – Query current IP Address
|IP192.168.001.100<CR> -
Set IP Address to 192.168.001.100
Note:
Setting takes effect when Gateway address is set

HDMI Audio Extractor with Power Amplifier
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Command Response Function and Example
SB? or
|SBx SBxxx.xxx.xxx.xxx<CR> Controls Subnet Mask setting
SB?<CR> – Query current Subnet Mask
|SB255.255.255.000<CR> -
Set the Subnet Mask to 255.255.255.000
Note:
Setting takes effect when Gateway address is set
GW? or
|GWx GWxxx.xxx.xxx.xxx<CR> Controls Gateway address setting
GW?<CR> – Query current Gateway address
|SB255.255.255.000<CR> -
Set the Subnet Mask to 255.255.255.000
Note:
Setting takes effect when Gateway address is set
DHCPx
DHCPx<CR> Controls the DHCP status on LAN Enabled Versions
DHCP?<CR> – Query current DHCP Setting
DHCP1<CR> – Turn on DHCP (Factory Default)
DHCP0<CR> – Turn off DHCP (STATIC Addressing)
SPx
SPx<CR> Controls the Serial Data Pass-Thru Status
SP?<CR> – Query current Serial Pass-Thru Setting
SP1<CR> – Turn on Serial Pass-Thru
SP0<CR> – Turn off Serial Pass-Thru (Factory Default)
BPx or
BPx,y BPx<CR> BPx,y<CR> Controls transmission of stored serial commands
BP?<CR> – Query current Button Press Status
BP1<CR> – Simulates pressing button #1
BP0<CR> – Simulates pressing button #0
BP1,0<CR> – Simulates turning button #1 off
AUx
AUx<CR> Controls AUTO DETECT Mode
AU?<CR> – Query current Auto Detect Mode Status
AU1<CR> – Auto Detect Mode Active
AU0<CR> – Auto Detect Mode inactive (Factory Default)
ATx ATx<CR> Controls the Auto Detection Method Settings
AT?<CR> – Query current Auto Detection setting
AT0<CR> – Auto Detection Disabled (Factory Default)
AT1<CR> – +5VDC on HDMI INPUT
AT2<CR> – Video on HDMI INPUT
AT3<CR> – Contact Closure (CCW & GND)
Auto Detect must be active (AU1) for a Trigger to occur.
Disabling Auto Detection will turn off Auto Detect (AU0).
Note:
Using the AUTO DETECT Contact Closure (AT3) will
disable the ability to use the Encoder or Page Sensor.

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15
Command Response Function and Example
PGx PGx<CR> Controls the Encoder/Page Sensor Setting
PG?<CR> – Query current Encoder/Page Sensor setting
PG0<CR> – Rotary Encoder (Factory Default)
PG1<CR> – Page Sensor (Model VSA-PGSNS)
PG2<CR> – Contact Closure (CW & GND)
Note:
Using the Rotary Encoder or Page Sensor will disable the
ability to use the PAGE SENSE (CW & GND) and AUTO
DETECT (CCW & GND) contact closures.
Using the PAGE SENSE (CW & GND) Contact Closure
will disable the ability to use the Rotary Encoder or Page
Sensor.
XCxx XCx <CR> Controls device addressing
XC?<CR> – Query current device address
XC0<CR> – Set device address to 0 (Factory Default)
XC1<CR> thru XC99<CR>
Set device address to 1 thru 99
Note:
All devices in the daisy chain will respond with the
device address, in order (closest to RS-232 IN 1st and
then each subsequent unit).
DA? DA? <CR> Queries current device ID # (Factory Default = 0)
(Set via USB GUI).
ISx ISx<CR> Input Selection
IS?<CR> – Query current input selection
IS0<CR> – Select LOCAL HDMI Input on rear panel
(Factory Default)
If UHBX-SW3-WP/S Installed (WP1):
IS1<CR> – Select HDMI #1 Input on UHBX-SW3
IS2<CR> – Select HDMI #2 Input on UHBX-SW3
IS3<CR> – Select VGA Input on UHBX-SW3
If UHBX-SW-WP/S NOT Installed (WP0):
IS1<CR> thru IS3<CR> – Select HDBT Input
IRx IRx<CR> IR Direction Selection
IR?<CR> – Query current IR direction selection
IR0<CR> – IR Detector connected to 3.5mm IR on rear
panel
IR1<CR> – IR Sender connected to 3.5mm IR on rear
panel (Factory Default)

HDMI Audio Extractor with Power Amplifier
16
Command Response Function and Example
WPx WPx<CR> UHBX-SW3-WP/S Installed Selection
WP?<CR> – Query current UHBX-SW3-WP/S Installed
selection
WP1<CR> – UHBX-SW3-WP/S Installed
WP0<CR> – UHBX-SW3-WP/S NOT Installed
UIx UIx<CR> X21-UI Installed Selection
UI?<CR> – Query current X21-UI Installed selection
UI1<CR> – X21-UI Installed
UI0<CR> – X21-UI NOT Installed
HPx HPx<CR> HDBT RS-232 Bypass Selection
HP?<CR> – Query current HDBT RS-232 Bypass
selection
HP1<CR> – HDBT RS-232 is bypassed directly to the
RS-232 OUT terminal strip.
HP0<CR> – HDBT RS-232 is NOT bypassed to the RS-
232 OUT terminal strip.
Note:
When HDBT Bypass is active, the user cannot control the
unit from the HDBT input until HDBT Bypass is made
inactive again.
APx APx<CR> Auto Detection Input Priority Selection
AP?<CR> – Query current Auto Detection Input Priority
selection
AP0<CR> – Manual Control
AP1<CR> – HDBT over Local HDMI
AP2<CR> – Local over HDBT
AP3<CR> – Last Plugged
BSx BSx<CR> Button State Selection (Bit Addressable)
BS?<CR> – Query current button state
BS0 thru BS255<CR> – Set the 8 programmable buttons
to a specific state, On or Off.
‘1’ bit = Button ON
‘0’ bit = Button OFF
BEx BEx<CR> Button Enable Selection (Bit Addressable)
BE?<CR> – Query current button enable/disable state
BE0 thru BE255<CR> – Enable or disable the 8
programmable buttons.
‘1’ bit = Button Enabled
‘0’ bit = Button Disabled
BTx BTx<CR> Button Type Selection (Bit Addressable)
BT?<CR> – Query current button type state
BT0 thru BT255<CR> – Sets the 8 programmable button
types.
‘1’ bit = Momentary button
‘0’ bit = Toggle button

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Command Response Function and Example
BGx BGx,y<CR> Button Group Selection
Button x = 0 thru 7
Button Group y = 0 thru 8
0 = NO GROUP, 1 thru 8 separate groups available
BG?<CR> – Query current all button group states
BGx?<CR> – Query button group state for button ‘x’
BG0,1<CR> – Set Button ‘0’ to Group #1
BG4,0<CR> – Set Button ‘4’ to Group None
Button Function Selection
Button x = 0 thru 7
Button Function y = 0 thru 11
BG?<CR> – Query current all button group states
BGx?<CR> – Query button group state for button ‘x’
BG0,1<CR> – Set Button ‘0’ function to Power
BG4,0<CR> – Set Button ‘4’ function to None
BFx,y BFx,y<CR>
0 = No Function
1 = Power (PW)
2 = Mute (MUT)
3 = HDMI (HD)
4 = LINE (LR)
5 = IR (IR)
6 = Volume Up (VUP)
7 = Volume Down (VDN)
8 = Local HDMI Input (IS0)
9 = HDBT Input or UHBX-SW3 HDMI Input #1 (IS1)
10 = HDBT Input or UHBX-SW3 HDMI Input #2 (IS2)
11 = HDBT Input or UHBX-SW3 VGA Input #3 (IS3)
12 = AUTO (AU)
BNx,y BNx,y<CR> Button Name Selection (displayed in WEBGUI)
Button x = 0 thru 7
Button Name y = Up to 8 characters in length
BN?<CR> – Query current all button names
BNx?<CR> – Query button name for button ‘x’
BN0,VCR<CR> – Set Button ‘0’ name to “VCR”
BN4,SAT<CR> – Set Button ‘4’ name to “SAT”

HDMI Audio Extractor with Power Amplifier
18
5.2 Auto Detection
This model supports sending user programmed RS-232 strings associated with the
‘AUTO’ function from the RS-232 OUT terminal strip based on different events:
Source +5V – Local or HDBT HDMI Source +5V
+5V from source detected sends the ON string.
+5V from source lost for more than the programmed OFF Delay sends the OFF string.
The OFF Delay is programmable from approximately 0 to 240 minutes (+/- 10%).
Factory default - 3 minutes
Source Video – Local HDMI Source VIDEO
HDMI Source Video detected for more than 1 second sends the ON string.
HDMI Source Video lost for more than the programmed OFF Delay sends the OFF
string.
The OFF Delay is programmable from approximately 0 to 240 minutes (+/- 10%).
Factory default - 3 minutes
Contact Closure – External contact closure connected on the CW & GND terminals.
Contact closed sends the ON string.
Contact open sends the OFF string.
Using this feature disables the use of a Rotary Encoder or Page Sensor.
5.3 Device Addressing
The model VSA-X21 units have the ability to daisy chain the RS-232 IN and RS-232 OUT
together with other units and have a serial controller at the head of the chain be able to
access all the units in the chain.
This is accomplished by setting a unique device ID for each model in the chain and then
enabling the serial pass-thru mode. This allows the RS-232 commands from the serial
controller to pass thru each unit to the end of the chain.
Commands will only work on the last device that the ‘XCx’ serial command was set for.
The factory default setting is DEVICE ADDRESS “0”.
All units in the daisy chain with the same DEVICE ID # (‘DA?’) will react to those
commands.