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3) General description of operations in the XON/XOFF mode
This mode is set when 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) .
OFF
ON
X-OFFX-OFF X-ON X-ON X-ON
Data Data Data
TXD
RXD
Print Operation
Paper Out Signal
ONLINE Lamp
Set Paper and Press
ONLINE Switch
Power ON Paper Out
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 (DC3; 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.
4) Buffer full/Buffer full cancel in the XON/XOFF mode
Buffer Full Near Full Near Empty Empty
Empty Area 256 Bytes Reception Data 256 Bytes
XOFF output XON Output
XOFF outputs only 1 byte when the empty area is a maximum of 256 bytes.
XON outputs 1 byte when the data in the buffer is a maximum of 256 bytes.
TSP1000 Series Product Specifications 12-6