EasyTalk USB Tools
Vaddio EasyTalk USB Solution - Document Number 342-0449 Rev A Page 45 of 48
Appendix 2: EasyUSB Mixer/Amp Serial Commands (ASCII)
The EasyUSB Mixer/Amp has an RS-232 command interface for configuration and real-time control. The
interface can be used interactively with a serial terminal emulator such as AMX or Crestron Control systems. The
DIP Switch 1 must be in disable mode for the EasyUSB Mixer/Amp to function as a Data Terminal Equipment
(DTE) device. The command echo and prompt can be enabled or disabled with the 6121 command. When
enabled, command input to the EasyUSB Mixer/Amp are echoed back, and a ‘>’ prompt character is
automatically output on a carriage return. When the command echo and prompt are disabled, the echo and
prompt characters are suppressed.
For all commands, the termination character is a carriage return (hex 0D). Responses from the EasyUSB
Mixer/Amp will end with a carriage return followed by a line feed (hex 0A).
The Baud rate of the EasyUSB Mixer/Amp is 38400. (However, if in DCE mode for direct connection to Vaddio
Cameras, baud rate will be 9600). The serial format for the EasyUSB Mixer/Amp is:
Stop Bit: 1
Data: 8 bit
Parity: None
Flow: None
The EasyUSB Mixer/Amp protocol is based upon a “Set” and “Get” scheme. Set commands automatically return
an acknowledgement upon execution.
The “Get” command returns a string representing the current value of the queried setting.
“Set” commands return one of three responses:
OK (4100),
Unknown command (4199), or
Bad parameter (4198).
“Get” commands return a response string indicating the command being responded to and the data requested.
The format of a “get” response is a 4-digit response code, a space, and a two-digit hex value. Examples of
command usage are:
Set Command Usage: > 6101 00 <carriage return> (unmute the microphones)
Response: > 4100 00 (Microphone not muted)
Get Command Usage:> 5101 <carriage return> (queries current mute state)
Response: >4101 00 (Microphone not muted)
EasyUSB Mixer/Amp Command Table
Command Argument Function Successful Response
5101 Get mute status (0=mute off, 1=mute on) 4101 bb (b=00 or 01)
5102 Get speaker volume (need range) 4102 vv (vv = volume value)
5103 Get mic volume (need range) 4103 vv (vv = volume value)
6101 0 or 1 Set mute off/on
4100 bb (bb=00 or 01, repeats 6101
argument)
6102 0 or 1 Decrement/increment speaker volume
4100 bb (bb=00 or 01, repeats 6102
argument)
6103 0 or 1 Decrement/increment mic volume
4100 bb (bb=00 or 01, repeats 6103
argument)
6121 0 or 1 Disable/enable serial echo None if arg=0, 4100 01 if arg=1
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