php-modbus/tests/ModbusMasterUdp/ref/test.fc4.php.html

Test should pass when %IX0.0==FALSE and %IX0.1==TRUE
array(4) {
  [0]=>
  int(0)
  [1]=>
  int(2)
  [2]=>
  int(0)
  [3]=>
  int(0)
}