Lexmark C752 Technical Reference page 348

XON/XOFF Protocol Timing (RS-422)
When you select this data flow control protocol, your printer sends an XOFF signal
when it detects the following BUSY conditions:
•
•
•
XMT
RXD
Note:
Serial Errors
Your printer places an underscore character in the link buffer when it detects an error.
Some printers post a
the number of the serial port) the first time they detect a transmission error (parity,
overrun, or framing). The
reset from your printer operator panel or through MarkVision Professional. Refer to
your printer user documentation for more information.
If repeated serial errors occur, power the printer off and then back on to restore proper
serial operation.
The Serial errors that do not generate such an error message are:
•
•
•
Buffer full
Attendance error
Printer not in ready state
XON
The printer sends an XOFF signal (DC3 control or X'13') to request that data
transmission end until the buffer clears. About 640 free bytes remain in the
buffer at this time. If the computer continues to send data after the printer
sends an XOFF signal, data could be lost.
54 Standard Serial Error
54 Standard Serial Error
Serial Break
Framing error received simultaneously as a Break
Powering on an IBM-compatible personal computer connected to the printer
8-39
XOFF XON
or a
54 Serial Option x Error
or the
54 Serial Option x Error
Interfaces
(x represents
can be