DC-WME-01T-S EOS: 82000977_M3 22.214.171.124
has no serial port command line interface (CLI) enabled by default.
Also using the "reset to factory defaults" method does not have the CLI enabled.
Recently due to new WiFi regulations the Ad-Hoc mode was removed.
The only remaining way to configure WiFi parameters is to connect via WiFi to the HTTP configuration page -> Catch-22
To change WiFi parameters you either need to access the configuration page through existing WiFi connection, or if this is not available to reset back to factory defaults, which affords to have a local AccessPoint with SSID=connect, encryption=none, DHCP server enabled.
Jun 12, 2019