ZD421 and ZD621 Desktop Printer User Guide

Ethernet (LAN, RJ-45)

Your printer requires UTP RJ-45 Ethernet cable rated CAT-5 or better.

For printers purchased in the EMEA region after August 1, 2025, you must configure a Protected Mode password and front panel password for the printer before you can perform wired or wireless setup. For additional information, go to zebra.com/asr or refer to the Zebra Link-OS PrintSecure Printer Administration Guide.

For other printers with Protected Mode enabled, depending on the configuration, you may need to enter the Protected Mode password to change certain settings on the printer. For more information, refer to the Zebra Link-OS PrintSecure Printer Administration Guide.

Your printer must be physically connected to your Ethernet / LAN network using the appropriate cable and be configured properly to make a network connection and operate on your network.

The printer includes an in-built network print server which can be accessed through the printer’s print server web pages.

1	Ethernet cable (RJ-45 connector)

For information on how to configure your printer to run on a compatible Ethernet / LAN, see the Wired and Wireless Print Server User Guide.

Ethernet Status / Activity Indicators

The Ethernet connector on the printer has two status / activity indicators. These indicators are partially visible to provide interface status at the connector.

The printer has user interface also has indicator lights. These lights display printer network operation status. See Meaning of the Indicator Light Patterns for more details.

LED Status	Description
Both OFF	No Ethernet link detected.
Green	100 Mbps link detected.
Green with the Amber flashing	100 Mbps link and Ethernet activity detected.
Amber	10 Mbps link detected.
Amber with the Green flashing	10 Mbps link and Ethernet activity detected.