The Digitize; The Output Digitized Point And Pen Status Instruction, Od - HP 7470A Interfacing And Programming Manual

SYNTAX DP (terminator)
EXPLANAHUN No parameters are used. The instruction will execute
even if no terminator is received.
When the DP command is received, automatic pen lift is suppressed
and the plotter is ready to have a digitized point entered by pressing
ENTER on the front panel.
When ENTER is pressed, the X— and Y—coordinates of that point and pen
up/ down status are stored for retrieval by the OD command. Pressing
ENTER sets bit position 2 of the status byte, indicating a digitized point
is available for output.
After ENTER h as been pressed, automatic pen lift is reactivated.
The Digitize Clear Instruction, DC
DESCRIPTION The digitize clear instruction, DC, provides a means to
terminate digitize mode.
M This instruction can be used to terminate digitize mode with­
out entering a point. If you are using an interrupt routine in a digitiz­
ing program to branch to some other plotting function, you could use
DC to clear digitize mode immediately after branching.
SYNTAX DC (terminator)
EXPLANAHUN No parameters are used. The instruction will execute
even if no terminator is received.
When the DC command is received, digitize mode is terminated. Auto­
matic pen lift is reactivated.
The Output Digitized Point and
Pen Status Instruction, OD
DESCNP-"UN The output digitized point and pen status instruction,
OD, is used to output the X-and Y—coordinates and pen up/ down status
associated with the last digitized point.
USES This instruction is used after DP and ENTER in all digitizing
applications to return the coordinates of the digitized point to the
computer.
SYNTAX OD (terminator)
EXPLANATIONNo parameters are used. The instruction will execute
even if no terminator is received.
DIGITIZING 6-3