Casio UP-250 Technical Manual page 147

XON/XOFF Transmission Timing
When XON/XOFF control is selected by the DIP switch, the printer transmits XON/OFF to the
host according the table below.
NOTE:
For the different models, XON/XOFF transmission timing differs, depending on the settings
of the off-lineconditions by the DIP switches. Refer to the specifications for the printers.
XON/XOFF transmission timing
Printer status
XON • When the printer goes on line after turning on the
transmission power or reset using the interface.
• When the receive buffer is released from the buffer-
full state.
• When the printer switches from off line to on line (*1). —
• When the printer recovers from an error through a
command.
XOFF
• When the receive buffer becomes full.
transmission
• When the printer switches from on line to off line (*2). Transmission Transmission
(*1) ON 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.
Data Format When Using RS-485
Transmission data (8 bits, no parity)
START
"H" indicates:
Printer transmission data
Printer reception data
3
2
1
RS-485 Communication data format
SD1 < SD2
RD1 < RD2
Off-line status
DIP SW status
ON
Transmission Transmission
Transmission Transmission
—
Transmission Transmission
4
5
6
— 138 —
OFF
Transmission
Transmission
STOP
7
8