RS 485 Non Blocking Library Nick Gammon

hi everyone,
please can guide me how can master send message multiple slaves using rs 485 non blocking library nick gammon.

here link

http://www.gammon.com.au/forum/?id=11428

as trying understand code unable find variable define slave want send message. in blocking code message includes i.e
both blocking , non blocking libraries in above link,

quote

byte msg [] = {
1, // device 1 (slave) address
3 // turn light on command received
};

please me.

code: [select]

  // assemble message
  byte msg [] = {
     1,    // device 1
     2,    // turn light on
     level // level
  };
the first byte of message says slave supposed deal message. there 2 ways send messages multiple slaves, depending on whether multiple means o more one.

if means all, decide slave number means all, , send message number. each slave programmed react own number , 1 means all.

if means more 1 (but not all), send multiple messages, each specific slave.

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