FUJITSU M304X - Manual (Page 80)

Table 6.1 RS-232-C interface signal lines
Signal name
Data Set
Terminal
1
-3 v
-3 v
Direction Functions
this signal is 0, the host is ready
transmit data (data this signal is
1, the printer ignores data on the Receive Data
line.
Data on the RD line can be validated regardless
of this signal state.
signal is 0 when the host is in data mode.
It is 1 the host in test mode (e.g.,
during local test).
of the following modes is selected the
operator operates as follows:
1. Constant mode
If power is turned on and no occurs in
the printer, the printer sets this signal to
and is ready to start: (ready to print the
received from the the printer
starts, this signal not set 1.
If power is turned on and an error in
the printer, this is not set to 0 and
the printer is nor to start. If this
state this signal can be set to D and
the printer can be ready to start by
correcting the cause of the
and pressing
the switch.
2. Drop DTR Start/Stop mode
signal is set 0 with the following
riming:
No error and
The START/STOP switch was pressed.
This signal is set 1 with the following
timing:
An error occurred in the printer,
START/STOP switch was pressed.
Notes:
Printer state means that the printer is
printing data received from the host is
ready to print (it not actually printing
if the interface buffer is empty.)
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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