Table 6.1 RS-232-C interface signal lines
-
IZontinued
Signal name
Data Set
Ready
(DSR)
L%ta
Terminal
.eady
(DTR)
T
-
1
-
-3 v
-3 v
-
)
-
3
v
-
SysteHrinfer
+
3v /
t
-
/Direction
Functions
-
When
this signal is 0, the host is ready to
transmit data (data
modr!). ‘&en
this signal is
1, the printer ignores data on the Receive Data
(RD)
line.
Data on the RD line can be validated regardless
of this signal state.
This
signal is 0 when the host is in data mode.
It is 1
when
the host
ir;
in test mode (e.g.,
during local
loopback
test).
One
of the following modes is selected the
operator panel.
This
si.gnal
operates as follows:
1.
DTR
Constant
Cm
mode
If power is turned on and no en-or occurs in
the printer, the printer sets this signal to
(
and is ready to start: (ready to print the
datz
received from the
hoa).
After the printer
starts, this signal
i.s
not set to 1.
If power is turned on and an error occurs in
the printer, this
si(pnal
is not set to 0 and
the printer is nor
rsady
to start. If this
state occurs, this signal can be set to D and
the printer can be ready to start by
correcting the cause of the error and pressing
the
START/STOP
switch.
2. Drop DTR Start/Stop mode
ibis signal is set
fc~
0 with the following
riming:
- No error occured, and
-
The START/STOP switch was pressed.
This signal is set
tc~
1 with the following
timing:
- An error occurred in the printer,
01‘
-
The
START/STOP switch was pressed.
Notes:
1)
Printer start state means that the printer is
printing data received from the host or is
ready to print (it
is:
not actually printing
if the interface buffer is empty.)
2)
When the DTR protocol is used, this signal
does not operate as described above. For
details, see Section 6.4.3.
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