Communication Protocol for Liquid Dispensing Vending Machines

The communication interface includes the choice of a physical interface for communication at the physical level and a protocol for communication at the logical and program level. The paper examines the development of a binary communication protocol between liquid dispensing machines. The commands that execute the implemented protocol are: retrieve the state of the dispensing machine; extracting the scanned payment card number from a given machine; extracting the credit from the card when dosing is done; retrieving the available credit on the card scanned for payment; setting parameters of a bottle from a given machine; setting doses in a given machine; allowing/disallowing/ dosing from a given bottle from a given machine or for the entire machine; service mode of the machine.