HP 7470A Interfacing And Programming Manual
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SYNTAX DP (terminator)
EXPLANAHUNNo 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
ENTERon the front panel.
When ENTERis pressed, the X—and Y—coordinates of that point and pen
up/ down status are stored for retrieval by the OD command. Pressing
ENTERsets bit position 2 of the status byte, indicating a digitized point
is available for output.
After ENTERhas 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 digitizemodewith
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)
EXPLANAHUNNo 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—coordinatesand pen up/ down status
associated with the last digitized point.
USES This instruction is used after DP and ENTERin 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