Martin Audio ENGINEER Guia do Utilizador descarregar pdf (Página 77)

Engineer 418 & 818 User Manual Page 77

The third variable in our information package is the checksum, which is defined in the same way as described

above: The sum of bytes 0 to 3 combined with a binary AND calculation with 127.

The gain information package is defined as follows:

Byte index 0 1 2 3 4 5

Data 254 12 Node index Gain index 255 Checksum

Again, an example. If we want to set the gain for “Zone 1” (defined as “Dance Floor” in the screenshot above)

to -2 dB, we construct our package as follows:

Node index for zone 1 = 136

Gain index for -2 dB = 172

Checksum calculation:

254 + 12 + 136 + 172 = 574

Checksum = 574 & 127 = 62

To set the volume for zone “Dance Floor” to -2 dB we would now do the following:

 Open a connection to the device

 Set the RTS pen

 Wait for 10 ms

 Send package 254 12 136 172 255 62

 Reset the RTS pin

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Martin Audio ENGINEER Guia do Utilizador Página 77