http://www.m-bus.com/mbusdoc/md4.php
https://www.google.co.uk/url?sa=t&source=web&rct=j&url=https://www.belcom.co.uk/wp-content/uploads/2015/02/M-BUS-O-Bus.pdf&ved=2ahUKEwiF0P2Ui6PaAhXpCsAKHclMC5MQFjARegQIABAB&usg=AOvVaw2dkSgz9jSCz3_PTHISxdG2
https://www.google.co.uk/url?sa=t&source=web&rct=j&url=https://sycous.com/wp-content/uploads/2016/06/Your-guide-to-MBUS.pdf&ved=2ahUKEwiF0P2Ui6PaAhXpCsAKHclMC5MQFjABegQIAxAB&usg=AOvVaw2sevNFE0T-SDvH7a-1qulr
https://www.google.co.uk/url?sa=t&source=web&rct=j&url=http://www.syxthsense.com/support/ConfigurationGuides/MT8.100-MBUS.pdf&ved=2ahUKEwiF0P2Ui6PaAhXpCsAKHclMC5MQFjAAegQIBhAB&usg=AOvVaw3OZcurmWrPiVwD_o3t4fQr
