Polycom Vortex EF2211 User Manual

6.1. Boolean Commands
Boolean commands take one of the three following arguments.
● '0' indicates that the parameter should be turned off.
● '1' indicates that the parameter should be turned on.
● '2' indicates that the parameter should be toggled (i.e., '0' becomes '1' and '1' becomes '0').
Parameters associated with boolean commands can be queried using the '?' character. For example, if
input A is muted, and you send ' S04MUTEIA? ', the EF2211 will respond with a status message of '
S04MUTEIA1 '. When a status message is generated for a boolean command, the command data will
either be a '0' or '1', since '2' is obviously not a valid state.
6.2. Integer Commands
Integer commands can take one of two types of arguments. The first argument type is absolute,
meaning that the parameter will be set to the specified number. For example, ' S04GAINIA10 '
means that the gain on input A will be set to 10 dB. In this case, the device will respond with a status
message of ' S04GAINIA10 '.
The second argument type is relative, meaning that the parameter will be incremented or
decremented by the specified amount. The increment character is '>' and the decrement character is
'<'. For example, ' S04GAINIA>3 ' increments the gain on input A by 3 dB. If the input's gain was
previously set to 6 dB, then it would now be set to 9 dB. In this case the device would respond with a
status message of ' S04GAINIA9 '.
The numeric part of both the absolute and relative arguments can contain a '+' or '-' to indicate the
algebraic sign of the argument. If no sign is given, '+' is assumed.
The parameters associated with integer commands have maximum and minimum values associated
with them. If you try to set a parameter above its maximum or below its minimum, the parameter will
be set to its maximum or minimum value, respectively.
Parameters associated with integer commands can be queried using the '?' character. For example, if
input A 's gain is set to 12, and you send ' S04GAINIA? ', the device will respond with a status
message of ' S04GAINIA12 '.
6.3. Channel Commands
A command can be a channel command in addition to being one of the other types of commands
(integer or boolean). A channel command means that the command applies to a specific input or
output channel. The channel is specified by a single character (e.g., '1', 'A', 'B', etc.) occurring before
any other payload data.
An example of a boolean channel command is the '
AGC' (Automatic Gain Control) command. '
S04AGC10 ' disables the AEC on input channel 1 . After sending this command, the device will

Polycom Vortex EF2211 Specifications

Power

input voltage	110-240 VAC
frequency	47-63 Hz
power consumption	25 W
phantom power	24 V

Connectors

RS-232	DB9F
EF Bus In/Out	RJ45
Telephone Line/Set	RJ11
Control/Status	DB25F
Audio	3.5mm quick connect terminal blocks

Audio Specifications

microphone input	-30 dBu to +0 dBu
line inputs	-20 dBu to +0 dBu
line outputs	-20 dBu to +0 dBu
loudspeaker output	10 W, 4-16 Ohms
input impedance	10 k Ohms
output impedance	50 Ohms
headroom	20 dB
signal to noise ratio	85 dB
frequency response	20 Hz - 22 kHz

Echo and Noise Cancellation

total cancellation	65 dB
convergence rate	40 dB/second
noise cancellation	0-15 dB
echo cancellation	40 dB, total >65 dB
convergence	30 dB/second
cancellation span	32 ms
acoustic echo cancellation span	270 ms

Operating Environment

operating temperature	0 °C - 40 °C
status outputs	5 V, 20 mA each

Weight and Dimensions

width	483 mm
length	244 mm
height	45 mm
weight	1.8 kg
shipping weight	2.5 kg