Not all EnGenius switches can be configured via CLI and not all EnGenius switches with CLI support have RJ45 console ports. The EWS2910P and EWS1200DT-10T do not have RJ45 console ports.
The EGS2108P, EGS2110P, and EGS5110P are smart PoE switches do not support CLI.
Table 1: List of EnGenius switches