Star Micronics SP200F SERIES - Manual (Page 97)

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APPENDIX
A-4-2. X-ON/X-OFF mode
This mode is enabled for the RS-422A interface when the DIP switch 2-6 is
set to ON.
If printer errors do not occur after the power is turned on, the printer outputs a X-
ON (DC1 by control code; 11H by hexadecimal data) signal on the TXD signal
line. When the host computer receives the X-ON signal, the host computer
transmits the data to the RXD signal line.
The printer outputs a X-OFF (DC3, 13H) signal when the empty space in the
buffer reduced below 256 bytes. When the host computer receives the X-OFF
signal, it halts output of data. However, the printer can continue receiving data
until the buffer becomes completely full.
The printer outputs an X-ON signal when the data in the buffer is printed out and
drops to below 256 bytes.
TXD
RXD
ON
OFF
X–ON X–OFF X–ON X–OFF X–ON
Printing
Paper out
signal
ON LINE
lamp
Data Data Data
Paper out Power ON Load paper and press
the ON LINE switch.