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6.4.3 DTR line protocol
The DTR line protocol is the same as the Reverse Channel line protocol.
This signal is turned from off (1) to on (0) under the following conditions:
. Printer is in the start state and,
. The interface buffer is empty or almost empty.
This signal is turned from on to off under one of the following conditions:
. Printer is in the stop state (error
occured,
cover open, end of forms, or
operator pressed the START/STOP switch) or,
. The interface buffer is almost full.
Note:
If this line protocol is enabled,
the printer received data via the
RD
line whether the DTR signal is on or off.
For timing details, see Figure 6.7.
6.4.4 RTS line protocol
The RTS line protocol is the same as the Reverse Channel line protocol.
This
signal
is
turned from off (1) to on
(0)
under the following conditions:
. Printer is in the start state and,
. The interface buffer is empty or almost empty.
This signal is turned from on to off under one of the following conditions:
. Printer is in the stop state or,
. The interface buffer is almost full.
Note:
This protocol enables the connection of a printer operating as data
terminal equipment (DTE) to a host operating as DTE.
However, this
protocol is not used to connect this printer to a host operating as data
circuit terminating equipment
(DCE). In addition,
th:is
printer ignores
a Status Request command when this protocol is enabled.
For timing details, see Figure 6.8.
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