Manual Polycom Vortex EF2280 (page 11 of 105) (English)

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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 'F04GAINIA? ', the device will respond with a status message of 'F04GAINIA12

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', '2', 'A', 'B', etc.) occurring before any other payload data.

An example of a boolean channel command is the '

AGC' (Automatic Gain Control) command. 'F04AGC30 '

disables the AEC on input channel 3 . After sending this command, the device will respond with a status message

of 'F04AGC30 '.

An example of an integer channel command is the '

GAINI' command, which adjusts the gain on the input

channels. 'F04GAINIA12 ' sets the input gain of channel A to 12 dB. After sending this command, the device will

respond with a status message of 'F04GAINIA12 '.

A wildcard character ('*') can be used as the channel specifier for many of the channel commands. If this is the

case, there are two options for specifying the values for the channels. The first method is to specify a single

value that will be applied to all the channels.

Take the

MUTEI command for example: 'F04MUTEI*1 ' mutes input channels 1-8 and A-D After sending this

command, the device will respond with a status message of 'F04MUTEI*111111111111 '. In this status

message, the device reports the status of all the channels. Since the MUTEI command applies to channels 1-8

and A-D the status of all 12 channels. The first (left most) value corresponds to channel 1 and the last (right

most) value corresponds to channel D .

This leads us to the second method of using a wildcard character: specifying the values for each of the channels.

For example, 'F04MUTEI*101010101010 ' mutes channels 1, 3, 5, 7, A, C and unmutes channels 2, 4, 6, 8, B,

D . In this case, the device will respond with a status message of 'F04MUTEI*101010101010 '.

As an interesting example, consider sending 'F04MUTEI*2 ' after the above example. The device will respond

with a status message of 'F04MUTEI*010101010101 '. Notice that all the states have been toggled.

Queries using the '?' character are straightforward. For example, 'F04MUTEI1? ' might return 'F04MUTEI11 ',

while 'F04MUTEI*? ' might return 'F04MUTEI*111111110000 '.

Using the wildcard character with integer channel commands is similar to using it with boolean commands, but

there are some differences. If we sent 'F04GAINI*10 ', the input gains on channels 1-8 and A-D will all be set

to 10 dB. The device will respond with a status message of 'F04GAINI*ÄÄÄÄÄÄÄÄÄÄÄÄ '. Those weird

characters are the main difference between using wildcards with integer channel commands versus boolean

channel commands. When reporting multiple integer values, the Vortex uses a binary format with one byte per

integer value. This allows for more compact commands and reduces RS-232 and bus traffic. To convert from an

integer value to a byte value, we add 132 to the integer value. In the above example, where the gain is set to 10

dB, we have: 10 + 132 = 142 = 0x8E (hex) = Ä (ASCII). The reason for adding 132 is to allow us to

conveniently represent negative numbers as well as avoid the use of special characters that are normally used in

RS-232 and EF Bus communications.

When using a wildcard character to specify separate values for each channel, you must also use the binary

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