A modular banknote apparatus comprising: a banknote acceptor module including an acceptor module PCB ; a banknote dispenser module including a dispenser module PCB ; at least one banknote storage drum module including a storage drum module PCB ; and a banknote transport module including a transport module PCB ; wherein: said banknote transport module mechanically and electrically interconnects said at least one banknote storage drum module and said banknote dispenser module ; the banknote transport module is configured to provide electronic control of both the banknote dispenser module and the at least one banknote storage drum module in a respective master and slave relationship, wherein the transport module PCB sends operation instructions to the dispenser module PCB and the storage drum module PCB , and receives confirmation signals from the dispenser module PCB and the storage drum module PCB ; and the banknote acceptor module is releasably connected to the banknote transport module , wherein said banknote acceptor module is configured to provide electronic control of the banknote transport module in a master and slave relationship, wherein the transport module PCB receives operation instructions from the acceptor module PCB . a banknote acceptor module including an acceptor module PCB ; a banknote dispenser module including a dispenser module PCB ; at least one banknote storage drum module including a storage drum module PCB ; and a banknote transport module including a transport module PCB ; wherein: said banknote transport module mechanically and electrically interconnects said at least one banknote storage drum module and said banknote dispenser module ; the banknote transport module is configured to provide electronic control of both the banknote dispenser module and the at least one banknote storage drum module in a respective master and slave relationship, wherein the transport module PCB sends operation instructions to the dispenser module PCB and the storage drum module PCB , and receives confirmation signals from the dispenser module PCB and the storage drum module PCB ; and the banknote acceptor module is releasably connected to the banknote transport module , wherein said banknote acceptor module is configured to provide electronic control of the banknote transport module in a master and slave relationship, wherein the transport module PCB receives operation instructions from the acceptor module PCB . said banknote transport module mechanically and electrically interconnects said at least one banknote storage drum module and said banknote dispenser module ; the banknote transport module is configured to provide electronic control of both the banknote dispenser module and the at least one banknote storage drum module in a respective master and slave relationship, wherein the transport module PCB sends operation instructions to the dispenser module PCB and the storage drum module PCB , and receives confirmation signals from the dispenser module PCB and the storage drum module PCB ; and the banknote acceptor module is releasably connected to the banknote transport module , wherein said banknote acceptor module is configured to provide electronic control of the banknote transport module in a master and slave relationship, wherein the transport module PCB receives operation instructions from the acceptor module PCB . <EOS>