Caller

rednet.open("back")
local monitor = peripheral.wrap("top")
local CurFloor = 9
monitor.clear()
while true do
  id, Elev1 = rednet.receive("ElevatorFloor")
  id, Elev2 = rednet.receive("ElevatorFloor2")
  if rs.getInput("front") == true then
    Elev1D = math.abs(CurFloor - Elev1)
    Elev2D = math.abs(CurFloor - Elev2)
    if Elev1D < Elev2D then
      rednet.broadcast(CurFloor, "ElevatorTarget")
    else
      rednet.broadcast(CurFloor, "ElevatorTarget2")
    end
    os.sleep(2)
  end
  monitor.setCursorPos(1,1)
  monitor.setTextScale(2.5)
  monitor.write(Elev1 .. "|" .. Elev2)
  os.sleep(0.15)
end