Star SP200F SERIES User Manual page 94

buffer is below 256 bytes. After the host computer detects that the DTR signal line
is at "MARK", transmission of the data text is stopped. In this instance, data can
still be received up until the data buffer becomes completely full.
When the empty space in the data buffer is increased by following printing (when
the data in the data buffer is reduced to 256 bytes or less), the printer sets the DTR
signal line to "SPACE".
Data buffer
Full Near Full
Empty area
256 bytes
DTR"MARK"
[Paper out]
When the "paper out" detector senses the end of the paper, the printer stops
printing after printing or feeding a maximum of two more lines on the paper.
Immediately after a "paper out" condition is detected, the printer sets to OFF
LINE and the DTR changes to "MARK". (To reset printer after a "paper out",
load paper into the printer and press the ON LINE switch to set the printer to ON
LINE.)
[Mechanical error]
Mechanical errors are detected when the motor locks and the unit will not print.
Immediately after a mechanical error occurs, the printer sets the DTR to
"MARK" and then sets the printer to OFF LINE. To cancel a mechanical error,
turn the power to the printer off and remove the cause of the error then turn the
power on again to reset the printer.
[Framing error]
A framing error occurs when "SPACE" is detected at the stop bit. When a framing
error or a vertical parity error occurs for the data which is received, the printer
prints out a "?" mark to indicate that the error occurred.
Near Empty
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Empty
Reception data
256 bytes
DTR"SPACE"