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ZT411 and ZT421 standard user connectivity interface for communication between printer and host. Included USB, TCPIP, RS232 and bluetooth.
Zebra Parallel Port Card - parallel adapter - parallel - P1083320-040 - Thermal Printer Supplies - CDW.com
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File:Overview of label printer COM and USB connector of Zebra GK420d in Michle, Prague.jpg - Wikimedia Commons
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Applicator Port Settings for Zebra Print Engines - TEKLYNX Reference - Efficient Business Integrators - Support
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