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The E-stop option for the QTerm-G55 graphic operator interface terminal uses a two-pole (four-wire) normally closed switch that meets United States and European requirements for machine safety. The placement of the switch above the terminal display allows easy access without hindering normal terminal operation. The rugged switch and terminal housing can withstand one meter drops onto concrete. The E-stop version of the terminal can be equipped with one EIA-232, -422 or -485 port, Ethernet 10Base-T or a Power-over-Ethernet (IEEE 802.3af) interface.