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Table
5.1 Centronics-compatible interface signal lines
-
continued
~
Signal
~
!
level
~
1
Signal name
~
(+)
Direction
I
COllCUlCS
,
i1:o
j
I
Syseem-Printer
j
ieleCt
~I~-
i
Ihis signal is when
:he
printer goes online by
~ I ~
i
pressing of
:he
START/STOP switch without the
i
fault state.
/
This signal is also issued when
the
DC1 code is received, because the printer goes
/
online.
1
:'
dlthout
this
signal,
the
hosi
cannot transfer
I
1
data.
I
'aper
Empty
5v
0
I
1
This signal is set to
1
when the end of forms is
i i
I
detected.
The
printer receives and
prints all
the data
to
the end
(BOF)
of the page
and
then
advances the forms
to
the next TOF position.
Ihe
printer also sends the Busy and Fault signals ant
goes offline.
iuse
/ 0
5”j
This signal is 1 when the printer power is on.
c5 v
15v/
0 i
j
This
is power for the external tester.
I
/
( ~
/
The
maxim,um
current is 500
mA.
!
Logic Ground
i
~-~-!
The maximum current in this logic ground line is
; 500
mA.
I
aassis
/
-
I
-
1
Flame
ground
;round
1
Figures 5.2 to
5.7
show character code transfer timing, control code receive
timing, DC1 code receive timing,
DC3 code receive timing, Skip-15-Lines command
receive timing,
and FCB data receive timing, respectively.
5
-4
BOZP-1500-OOOlA...05