Canon MP 1000 manual Timing Chart, Auto Feed XT

AUTO FEED XT

When this signal is low, the MultiPASS 1000 automatically feeds the paper one line when it receives a carriage return (CR) control code. This signal is valid only in Epson LQ mode.

INIT

INIT from the computer resets the MultiPASS 1000 to its initial power-on state. The BUSY line goes high and any received data is printed. When INIT goes low, the MultiPASS 1000 resets to the power-on default state.

ERROR

The MultiPASS 1000 sets the ERROR line low if it detects an error, such as an out-of-paper condition.

SELECT IN

When this signal is high, the DC1 and DC3 control codes are valid; otherwise they are invalid. This signal is valid only in Epson LQ mode.

Timing Chart

When you use the MultiPASS 1000 as a normal printer, the parallel interface transfers data in one direction only—from the computer to your MultiPASS 1000. The data path is 8 bits wide. The MultiPASS 1000 and computer synchronize data transfer with the interface signals STROBE, ACKNLG, and BUSY.

When the computer is ready to send a byte of data to the MultiPASS 1000, it puts the byte of data on the data lines (DATA 1 through DATA 8). Then the computer sends a STROBE pulse to the MultiPASS 1000, which responds with a BUSY signal.

When the MultiPASS 1000 receives the data, it pulses the ACKNLG line. This signals the computer that the MultiPASS 1000 has read the byte of data into memory. If the buffer is not full and it can receive more data it removes the BUSY signal.

The timing charts below illustrate the data and handshake lines during transfer of one data byte to the computer. DATA 1 through DATA 8 and the STROBE line are driven by the computer; the ACKNLG line is driven by the MultiPASS 1000.

NThe use and time of the signals for IEEE 1284-B have not been made public.

A-8Specifications Appendix A