Compuprint 4247-L03 Programmer Manua - Manual (Page 172)

This phase is initiated by the host and returns the interface to the compatibility mode.
Parallel Interface Signals
Description of the signals in monodirectional link:
Signal Name Pin N° Source Description
STROBE 1 HOST Clock signal which controls data transmission with its falling edge.
ACK 10 PRINTER Negative pulsed signal indicating that the printer has received data
and is ready to accept the next set of data. Also sent when the
printer is switched from off-line to on-line and at the end of the
initialization time. The BUSY line is always active.
DATA BIT 1 2 PRINTER /
HOST
Data 8 is the most significant bit. These are the data lines used by
host or printer to transfer control code or ASCII codes.
DATA BIT 2 3
DATA BIT 3 4
DATA BIT 4 5
DATA BIT 5 6
DATA BIT 6 7
DATA BIT 7 8
DATA BIT 8 9
BUSY 11 PRINTER When high, this signal indicates that the printer cannot accept data or
control codes. This signal goes high during data processing, in test
and program modes, during initialization, when the buffer is full, and
when a paper jam, paper end or paper size error occurs, in case of a
power-on reset, the reception of a STROBE signal, while the register
was not yet read, or when the INIT line is still active.
PE 12 PRINTER When high, this signal indicates that the automatic input bin is out of
paper and paper cannot be loaded from an other bin.
SELECT 13 PRINTER When high, this signal indicates that the printer is on-line. It is put to
low state in case of initialization or test and program mode. In IBM
Proprinter emulation in low condition this signal signals a off-line
request from the operator panel, paper jam, paper end or paper size
errors.
AUTOFEEDXT 14 HOST Active low level signal. Indicates whether a LF is performed after a
CR or not.
GND 16 – Logical ground level (0V).
CHASSIS GND 17 – Frame ground.
+5 VDC 18 PRINTER Is the DC voltage supplied by a component that limits the driven
capability up to 100 mA.
SIGNAL GND 19-30 – Signal ground.
INIT 31 HOST Active low level signal. Indicates, that the printer is initializing. The
BUSY signal is forced high.
ERROR 32 PRINTER When low, this signal indicates that the printer is offline, there is an
offline request from the operator panel, or the printer is in an error
state because of: paper jam, paper end or paper size error, engine
error, output bin full or cover open condition.
+5V 35 PRINTER Pulled up to signal.
SELECTIN 36 HOST Active low level signal. Enables the printer.
156 Programmer Manual