A-8 Specifications Appendix AAUTO FEED XTWhen this signal is low, the MultiPASS 1000 automatically feedsthe paper one line when it receives a carriage return (CR) controlcode. This signal is valid only in Epson LQ mode.INITINIT from the computer resets the MultiPASS 1000 to its initialpower-on state. The BUSY line goes high and any received data isprinted. When INIT goes low, the MultiPASS 1000 resets to thepower-on default state.ERRORThe MultiPASS 1000 sets the ERROR line low if it detects an error,such as an out-of-paper condition.SELECT INWhen this signal is high, the DC1 and DC3 control codes are valid;otherwise they are invalid. This signal is valid only in Epson LQmode.Timing ChartWhen you use the MultiPASS 1000 as a normal printer, the parallelinterface transfers data in one direction only—from the computerto your MultiPASS 1000. The data path is 8 bits wide. TheMultiPASS 1000 and computer synchronize data transfer with theinterface signals STROBE, ACKNLG, and BUSY.When the computer is ready to send a byte of data to theMultiPASS 1000, it puts the byte of data on the data lines (DATA 1through DATA 8). Then the computer sends a STROBE pulse to theMultiPASS 1000, which responds with a BUSY signal.When the MultiPASS 1000 receives the data, it pulses the ACKNLGline. This signals the computer that the MultiPASS 1000 has readthe byte of data into memory. If the buffer is not full and it canreceive more data it removes the BUSY signal.The timing charts below illustrate the data and handshake linesduring transfer of one data byte to the computer. DATA 1 throughDATA 8 and the STROBE line are driven by the computer; theACKNLG line is driven by the MultiPASS 1000.N The use and time of the signals for IEEE 1284-B have not beenmade public.
