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CHAPTER 4 DPC-COMPATIBLE INTERFACE
This chapter describes the DPC-compatible interface used for the I/O interface
connected to the
M304x
series line printer (printer).
4.:
Operation Outline
Basic printer operations, data transfer, printing, and forms feed are shown in
Figure 4.1.
/
Control code or the Skip
01
Space command
with the
Paperlnsrruction
signal
Dara
transfer cycle
I
Print
data
Data edition
Print
cycle
Data
rransfer
c:ycle
Print data
F
Data Request=
1
I
j
Approx.14ms
1
Figure 4.1 Basic operations
The printer starts the print cycle after receiving l-line print data sent from
the mainframe and one of the following:
. Control code (LF, FF, or CR code)
. Skip command (with the Paper Instruction signal
=
1)
. Space command
(with
the Paper Instruction signal
=
1)
For the control codes and the Paper Instruction signal, see Sections 4.3.2 and
4.4.2.
After l-line printing,
the printer starts the forms feed specified by
the control code or with the Paper Instruction signal.
The printer sets the
Data Request signal to one 14 ms before terminating forms feed and starts
receiving the next line of data during forms feed.
Therefore, unless the next
B02P-1500-OOOlA...05
4-1