Thyssen elevator car communication board MCTC-COB-A1 expansion pcb command board MCTC-CCB-F1 (7)

How to confirm the protocol:

Check whether the model suffix on the back of the command board has letters. Without letters, it is a standard protocol. With letters, it is a special protocol. The letters correspond to the protocol type. For example, MCTC-cOB-A1-Sz corresponds to a dedicated protocol.