Note: If the JTAG/Serial port is missing, hold the boot button while plugging in.
Then look at MCP for TUL. Most gateways relay group telegrams — they talk to devices somebody else configured with ETS. That one speaks the connection-oriented management services ETS itself uses, so an agent can give a device its address, install its tables and change its parameters. The stick answers MCP itself, over your LAN.
Flash it there — what it does, and what it deliberately will not do →