Casio UP-250 Technical Manual page 24

Switching between on line and off line
The printer does not have an on-line/off-line button. It goes off line under the following
conditions:
Between the time when power is turned on (including reset using the interface) and when
the printer is ready to receive data.
During the self-test.
During paper feeding using the paper FEED button.
Between the time when the printer stops printing for a paper-end and when the on-line
recovery wait time finishes after loading paper (if an empty paper supply is detected by
either the paper roll end detector or the paper roll near-end detector with a printing halt
feature enabled for low paper by ESC c 4).
When an error has occurred.
XON/XOFF transmission timing
When XON/XOFF control is selected, the printer transmits XON or XOFF signals as follows.
Printer status
• When the printer goes on line after turning power on or after
reset using the interface.
XON
• When the receive buffer is released from the buffer full state.
transmission
• When the printer switches from off line to on line (*1).
• When the printer recovers from an error through a command.
XOFF • During an error condition.
transmission • When the receive buffer becomes full (*2).
( 1) XON is not transmitted when the receive buffer is full.
*
( 2) XOFF is not transmitted when the receive buffer is full.
*
NOTE: The XON code is 11H and the XOFF code is 13H.
Serial interface connection example
NOTES:
Set handshaking so that transmitted data can be received.
Transmit data to the printer after turning on the power and initializing the printer.
Host
TXD
DSR
CTS
RXD
DTR
FG
SG
Printer
RXD
DTR
RTS
TXD
DSR
FG
SG
— 15 —
DIP SW 1-8 status
ON OFF
Transmission Transmission
Transmission Transmission
---- Transmission
---- Transmission
Transmission Transmission
Transmission Transmission
---- Transmission