242 IBM Proprinter Control Commands
ESC Q (22) Deselect Printer
ASCII:
ESC Q (22)
Control:
CTRL
[ Q (22)
Decimal:
27 81 22
Hexadecimal:
1B 51 16
Sets the printer so it will not accept data from the computer. This control
command is intended for diagnostic purposes only. The printer remains in
the off line state until Select Printer (DC1) is received, and cannot be
reselected by pressing
ON LINE
.
DC3 Deselect Printer on Serial Port
ASCII: DC3
Control:
CTRL
S
Decimal: 19
Hexadecimal: 13 07
Deselects printer when used with a serial interface.
Treated as a null on the parallel interface. On the serial interface, the
printer sends this control code to indicate its buffer is full. DC3 is the X-
OFF character.
See Appendix B for details regarding software handshaking.
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