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See the table below for the secondary interfaces for the 3800g. 3800g Models Models Primary Interfaces Secondary Interfaces 3800G04E, 3800G14E TTL level RS-232, USB, Keyboard wedge TTL level RS-232 3800G05E, 3800G15E TTL level RS-232, IBM Retail, USB, Retail USB, Keyboard wedge TTL level RS-232 Enabling the Secondary Interface The secondary interface can be programmed at any time. You can temporarily disable the secondary interface, but still retain the secondary interface settings in the imager