Specifications are provided for reference and are based on testing the ZT421™ printer
using genuine Zebra® supplies. Results may vary in actual application settings or when
using other-than-recommended Zebra supplies. Zebra recommends always qualifying
any application with thorough testing.
Standard Features
Printing
• Thermal transfer and direct thermal printing
• Thin film printhead with E3™ Element
Energy™ Equalizer for superior print quality
• 203 dpi print resolution (8 dots / mm)
• Print speeds per second up to 12"
(305 mm / second)
Communication
• USB 2.0, high speed
• RS-232 Serial (RS-232C with DB9F connector;
Configurable baud rate (2400 - 115,200kB),
parity, and data bits. Stop bits at 1 or 2;
Software (XON/XOFF), hardware (DTR/DSR or
RTS/CTS) communication handshake protocols)
• 10/100 Ethernet: Supports networks
internally integrated option that enables the
use of Webview and Alert features
• Bluetooth® 4.1 (including Apple®)
• Dual USB Host
Media Support
• Dual media sensors - transmissive
and reflective
• 3" media supply hanger
• Auto calibration - printer calibrates
when printer is turned on or when
printhead is closed
Firmware
• Resident ZPL®, ZPL II® and EPL™ programming
languages, selectable through software or
front panel
• XML-enabled Printing - allows XML
communications for barcode label
printing eliminating license fees and
printer server hardware while lowering
customization and programming costs
Audited Supplier 
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