1 controls the set-up for communication with the host computer
2 controls various parameter settings
3 allows manual control of the paper handling
4 gives information about the printer's status.
the 16-character liquid crystal display (lcd) (51) indicates the current status of the printer. if an error occurs (e.g. cover open), the resulting error message overrides any other displayed message. when the error condition not longer exists, the original status information appears on the display. the green power on indicator (53) is lit when the printer is supplied with power by setting the power on/off switch to on.
the yellow stop indicator (52) is lit when the printer is in the stop mode.
