12-6
2) Buffer Full/Buffer Full Cancel in DTR Mode
Buffer Full Near Full Near Empty Empty
Empty Area 256 Bytes Reception Data 256 Bytes
DTR "Mark" DTR "Space"
DTR is set to mark at the point the empty area is a maximum of 256 bytes.
DTR is set to SPACE when the data in the buffer is a minimum of 256 bytes.
3) General Description of XON/XOFF Mode Operation
This mode is set when the DIPSW #1-3 are turned OFF. This mode notifies the host of the XON (DC1) data
when the printer can receive data and the XOFF (DC3) data when the printer cannot receive data, using the
TXD signals.
This functions so that XON outputs only 1 byte when the printer shifts from OFFLINE (printer busy) to
ONLINE (printer ready) and; XOFF outputs 1 byte when the printer shifts from ONLINE (printer ready) to
OFFLINE (printer busy).
XON
TXD
RXD
Data
Print Operation
Paper Out Signal
ON
OFF
Online Lamp
Power ON
Paper Out
Press ONLINE Switch
After Setting Paper
Data Data
XON XONXOFF XOFF
If there is no error after turning the power ON, XON (control code name: DC1; Hexadecimal name: 11H) is
output by the TXD signal line. After the host computer receives the XON, it sends the data text to the RXD
signal line. XOFF (CD3; 13H) is output when the empty space in the data buffer is a maximum of 256 bytes.
The host computer stops sending data text when it receives the XOFF, however, the printer is capable of
receiving data at that time for the amount of empty space in the data buffer. Data exceeding the amount of
empty space is discarded. As the empty space in the data buffer increases through printing, XON is output
when the data in the buffer is a maximum of 256 bytes.
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