For Ethernet Connection - Brother PT-P900 Reference Manual

4.3.

For Ethernet connection

1) Communication Settings
Click the "Communication Settings" button at 4.1 "Printer Setting Tool", the Communication Settings screen
is displayed.
Click "Communication Settings" of the "General" tab and set "Network Settings on Power On" to "Wired
LAN by Default" as the following. (screen is example of TD-4550DNWB)
TD-4420DN, TD-4520DN, TD-2120N and TD-2130N/NSA are fixed in Wired LAN.
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MELSEC iQ-F Brother Label Printer Sample Program Reference Manual