Coupling system for electronic device

An electronic device coupling system, the system comprising:

• a plurality of electronic devices inserted together, the plurality of electronic devices comprises:
• a master device;
• and
• a plurality of slave devices inserted with the master device one by one in at least a chain;
• wherein each electronic device has a sequence number according to an insertion sequence, the sequence number is corresponds to all the information of local electronic device, the sequence numbers of the plurality of electronic devices are sorted according to the insertion sequence, the sequence number of the master device is a first number of the sequence;
• the master device is capable of setting a plurality of customized groups, and each customized group has at least one slave device;
• and the master device is coupleable to the at least one slave device in any one customized group by the sequence number and all the information corresponding to the sequence number;
• and
• wherein each customized group includes a different slave device assembly, and each customized group has a different group code stored in the master device.