Specifications

Operation Manual 3. Interface Specification
DR300 29
“high” or an X-On is sent to tell the host that it can again receive
data. See Figure 3-2.
All printer error conditions (i.e., label out, ribbon out) will cause the
printertogobusy(DTR “low” or X-Off) until the problem is cor-
rected and the printer is placed on-line. The printer will also be
busy if taken off-line from the front panel.
3.4 RS232C Serial Interface
General Specifications
Asynchronous ASCII
Half-duplex communication.
Ready/Busy Hardware Flow Control
Pin 20, DTR Control
Pin 4, RTS Error Condition
X-On/X-Off Software Flow Control.
Bi-Directional communication (ENQ/Response)
Data Transmission Rate
2400, 4800, 9600 and 19200 bps
Character Format
1 Start Bit (fixed)
7 or 8 data bits (selectable)
Odd, Even or No Parity (selectable)
1 or 2 Stop bits (selectable)
DTR Low or
X-Off
Buffer Available
DTR High or
X-On
0
26 34
Fig. 3.2