Epson II manual 196

						Interface Specifications
Signal Pin		Return Pin	Signal	Direction		Description
10	28		ACKNLG	OUT		About a 10-microsecond
						pulse. LOW indicates data
						has been received and
						that the printer is ready to
						accept more data. This
						signal is output as a pair
						with BUSY.
11	29		BUSY	OUT		A HIGH signal indicates
						that the printer cannot
						receive data. The signal
						goes HIGH in the
						following cases:
						During data entry
						(for each character)
						When off line
						During printer-error
						state
12	30		PE	OUT		A HIGH signal indicates
						the printer is out of paper.
13			SLCTOUT	OUT		Pulled up to 5 volts
						through 3.3 K ohm
						resistance.
14						When LOW, the paper is
			AUTOFEED		IN
						automatically fed one line
						after printing. (The signal
						level can be fixed using
						SelecType.) Sampling is
						carried out when the
						power is on or the printer
						is initialized with the
						control panel button.
15			NC

Technical Specifications 8-13