Device Control 1 (DC1) / Select or XON
11
This control has different meanings depending upon the currently active interface.
vParallel interface (Select): DC1 selects the printer.
vSerial interface (XON): DC1 is treated as a NUL if received from the host. The
printer sends DC1 (XON) to the host to control data pacing if XON/XOFF pacing
is selected.
Device Control 2 (DC2) / Cancel Condensed Print
12
This control cancels or ends condensed (17.1 or 20 CPI) printing. DC2 is a buffer
terminating control; if printable data at a different characters-per-inch setting is
buffered, that data is printed before the setting is changed. The current presentation
position becomes the next printable column at the new character-per-inch setting.
CPI can be changed within a print line.
Device Control 3 (DC3) / Deselect or XOFF
13
This control has different meanings depending upon the currently active interface.
vParallel interface (Deselect): DC3 is treated as a NUL.
vSerial interface (XOFF): DC3 is treated as a NUL if received from the host. The
printer sends DC3 (XOFF) to the host to control data pacing if XON/XOFF pacing
is selected.
Device Control 4 (DC4) / Cancel Double-Wide Print
14
This control cancels double-wide printing if double wide was selected with the Shift
Out control. The characters-per-inch setting returns to the previous value.
Cancel (CAN)
18
This control purges all buffered data. All data received after the most recent buffer
terminating control is discarded. For a list of buffer terminating controls, see “Buffer
TerminatingConditions” on page 241. Any data received after Cancel is processed
normally. Cancel does not change the current presentation position.
Space (SP)
20
This control moves the print position one character space to the right.
222 4247 Printer ModelA00 User’s Guide