Martin Audio ENGINEER Guia do Utilizador descarregar pdf (Página 75)

Engineer 418 & 818 User Manual Page 75

Recalling presets

Preset recalls work on an index basis. This means you'll need to know the preset number you want to recall.

You can check out the index that goes with each preset using the Engineer control software's preset

management window:

Downsync your project first, then hover your mouse for about 3 seconds over any preset in the preset

manager. The index will then be shown in the preset information.

The preset index used in previous versions of this protocol has now been deprecated: The preset type will be

automatically selected by the engineer when recalled. Therefore we can use a value of 0 for this parameter.

Now that you have these two parameters you can construct the information package required to recall a

preset. This package has the following syntax:

Byte index

Data 254 14 Preset index 0 255 Checksum

The “checksum” field's purpose is to ensure no data is lost during transmission. It's defined as follows:

Checksum = (254 + 14 + preset index + preset type) & 127

The “&” character in this calculation is a “binary AND” operation. If this calculation exceeds the range of one

byte (when the value's exceeds 255), the most significant bit is discarded.

An example: If we would want to recall a preset at index 2, the checksum would be:

254 + 14 + 0 + 0 = 268

checksum = 270 & 127 = 12

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Martin Audio ENGINEER Guia do Utilizador Página 75