System for interrogating serially-connected drug modules in a combinatorial drug delivery device

A combinatorial drug delivery device comprising:

• a plurality of serially connectable modules, each of the modules including at least one drug component;
• and,
• a master controller having a computing processing unit,
• wherein, each of the modules includes:
• a non-transitory memory having stored therein an alphanumeric code representative of the at least one drug component contained in the corresponding drug module;
• an actuatable switch having a normally open position, the switch being actuated to a closed position by connecting the corresponding drug module with another of the drug modules;
• a secondary controller operatively linked to the memory of the corresponding module;
• at least one communication bus connectable in series with the communication buses of the modules serially connected with the corresponding module,
• wherein, with the modules serially connected, each of the secondary controllers determines whether the corresponding switch has been actuated, wherein, upon determining that the corresponding switch has not been actuated, the corresponding secondary controller assigns to the corresponding memory a default address with the default address being transmitted to the master controller, wherein, the master controller serially issues commands to the secondary controllers to transmit pulsed signals to adjacent modules, and, wherein, depending on the number of pulsed signals received by the modules, the secondary controllers each assign to the corresponding memory an address with the addresses of the modules being transmitted to the master controller,
• wherein, the master controller is configured to serially interrogate the secondary controllers, using the addresses, to request the codes of the corresponding modules.