A linking system automatically sets communication protocol and station numbers for multiple consoles. One console is set as master console and the remaining consoles are set as slave consoles. Each console comprises a serial input end, a serial output end and a master/slave communication end. The serial output end of one slave console is connected to the serial input end of a next console to form a console series, while the master/slave communication ends of all consoles are in parallel connection. The master console sends communication protocol data to all slave consoles to set up the slave consoles. The first slave console generates a serial number of one and sends the serial number to next slave console. The serial number is added by one in the next slave console. This process is performed for each slave console and the final serial number is sent to the master console. Therefore, the maser console identifies the number of slave consoles and can assign station number for the slave consoles.