Polycom Vortex EF2241 Programming Manual page 43

So, the signal at output 3 is at 3 dB, while the signals at the rest of the outputs are at -20 dB.
The next two bytes (pp) consist of only one value.
p = 0x70 = 112 112 - 132 = -20
So, the signal level of both AEC references is -20 dB.
The next four bytes (pppp) consist of only one value.
p = 0x70 = 112 112 - 132 = -20
So, we know that the room gain for inputs 1-4 is -20 dB.
The next four bytes (èèèè) consist of only one value.
è = 0x8A = 138 138 - 132 = 6
So, we know that the AGC gain for inputs 1-4 is 6 dB.
The last four bytes (äàåç) consist of four different values.
ä = 0x84 = 132 132 - 132 = 0 = Idle
à = 0x85 = 133 133 - 132 = 1 = Transmit
å = 0x86 = 134 134 - 132 = 2 = Receive
ç = 0x87 = 135 135 - 132 = 3 = Double Talk
So, we know that the AEC on input 1 is in idle, input 2 is in transmit, input 3 is in receive, and input 4 is in
double talk.
In the above description, the data in the BLDATA command consists of 33 bytes (9 input levels + 10 output
levels + 2 AEC reference levels + 4 room gain levels + 4 AGC gain levels + 4 AEC states). It is possible to tell
the EF2241 to only send a subset of this information. There are two reasons you might want to do this. First,
it makes parsing the data easier since you can ask for only the data that you are interested in. Second, when
you decrease the amount of data being sent, the EF2241 can send the messages faster. This means that if
you are trying to implement a signal level meter, you can get faster refresh rates by asking the EF2241 to
only send the data you're interested in.
Suppose you were only interested in signal levels on inputs A-D. You could send the following command.
B01BLINFO000011110000000000000000000000000
In the above
BLINFO
positions of the data that we don't want. Now, when we send a BLDATA? command or enable BLAUTO, the
Vortex sends messages of the form:
B01BLDATAiiii
command, there are 1's in the positions of the data that we want and 0's in the