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Table 6.1 RS-232-C interface signal lines
-
Continued
Signal
Signal name
level Direction Functions
1 0
System--Printer
RSVUSS
channel
(SWSRS)
-3v
3v
If the Reverse Channel line prorocol is not
selected by setting at the operator panel, this
signal
stays
at
1.
If
selecwd,
the signal state
is as follows:
This signal is set to 0 when DTR is 0 or :he
interface buffer is empty or almost empty
(threshold is
set
at
the
operator panel).
lhis
signal is
set
to 1 when
;he
Interface
buffel
is almost full (threshold is
set
at the operator
panel) or before DTR is set
to
1.
The time from when :his signal is set
to
1 to
when
it is set
to
0 is more than 200 ms.
Ihe
active polarity of this signal can be set.
Signal
Ground
-
-
lhis
line is
d
signal ground line
between
the
(SG)
host and printer.
Frame Ground
-
-
(FG)
lhis line is
a
frame ground line between the host
and printer.
Ring
-3v 3v
If this
signal
is set
to
be effective, the DTR
i!
Indicator
~
(3V)
1(-N)
set
to
0 when this signal is 0.
(RI)
lhis
signal is set
to
0 for 0.5
to
0.7 set, and
after the DTR and DSR are set to 0 successively,
this signal is kept at 1. If the DSR is not
used, this signal is kept at 1 after the DTR is
set
to
0.
If an error or operator intervention
request does not occur in the printer, the
printer
tu?xls
on.
Received Line
-3v 3v
When
eransmiering
data
co
the
printer, the host
Signal sets
this signal on
(0).
The
host keeps this
Deeecror
signal at 0 during dara transmission.
(RLSD)
If this signal is 1, the printer ignores data on
the
RD
line.
Dara on the RD line can be
validaced by setting,
whethe:c
this
signal is 0
01
1.
Local
-3v
3v
This signal is
set
to
0 when the local
loopback
Loopback
(LL)
test is performed. The printer performs this
test when the host responds ‘by setting this
signal on
(0).
me
priner
always keeps this
signal at 0 during this test.
6-6
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