RS485 Master and Slave using Modbus

I am trying to find a simple example of using Modbus to link several Arduino Boards, simply sending digital and analogue signals from the Master to each Slave.  Modbus seems overkill but the application involves large distances outdoor lighting.  I have worked through the tutorials:

Long Distance Wired Serial Communication with Arduino using RS485 and CAT Cables

I have made this work but this only works for one Slave

RS-485 MODBUS Serial Communication using Arduino UNO as Slave

RS-485 MODBUS Serial Communication with Arduino as Master

Both of these involve a link to a computer and I can't work out how to adapt them to Arduino to Arduino.

Any assistance will be gratefully received

PS.  The tutorials are very good with full detail.

Mike