Canon MultiPASS C5000 Service Manual page 192

Part 2: Printer
BUSY
When the printer makes BUSY high, it cannot receive data. The BUSY line goes high in
response to a -STROBE pulse. This line remains high until the data are read. BUSY is
also high under the following conditions:
The receive buffer is full of data.
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*The printer receives an -1NIT signal.
P.E. (Paper End)
The printer sets P. E. high when it is out of paper or when a paper jam occurs. P. E.
remains high until the operator loads paper and presses the /RESUME button.
SELECT
When the printer is ready, it sets the SELECT line high. The SELECT line goes low
when:
*The printer receives the Printer Deselect command. It ignores all incoming data except
-AUTO FEED XT
If this signal is low when the printer is initializing, the printer automatically feeds the
paper one line when it receives a carriage return (CR) control code. This signal is valid
only in Epson LQ mode.
high, and any received data are printed. When -1NIT goes low, the printer resets itself to
the power-on default state.
-ERROR
The printer sets the ERROR line low if it detects an error, such as an out-of-paper
condition.
When this signal is high at initializing the printer, the DC1 and DC3 control codes are
valid; otherwise, they are invalid. This signal is valid only in Epson LQ mode.
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