Compuprint 9058 Programmer Manual - Manual (Page 133)

The Parallel Interface
A78408098-003 C.4
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
DATA BIT 2
DATA BIT 3
DATA BIT 4
DATA BIT 5
DATA BIT 6
DATA BIT 7
DATA BIT 8 2
3
4
5
6
7
8
9 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
.
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.