HP 7550A Emulation [KC-GL] (Mode 8)
7-103
OA [Output Actual position and pen status]
The plotter returns the x- and y-coordinates of the current pen position and indicates
whether the pen is currently up or down. This information is given by ASCII-coded inte-
gers in the following format:
X, Y, P TERM
X: x-coordinate in absolute plotter units
Y: y-coordinate in absolute plotter units
P: 0 if the pen is up; 1 if the pen is down
OC [Output Commanded position and pen status]
The plotter returns the x- and y-coordinates and pen status for the last valid pen position-
ing instruction. The pen position and status are ASCII-coded in the same way as the OA
instruction. Coordinate values are given in plotter units if scaling is off, or user units if
scaling is on.
OE [Output Error]
The plotter returns a decimal error number for the instruction executed immediately
before the OE instruction. The error code is converted to a non-negative ASCII-coded
integer whose identity is given in the following table.
OF [Output Factors]
This instruction returns the number of plotter units per millimeter on each coordinate
axis, as follows:
40, 40 TERM
This response indicates that plotter units are equal to 0.025 mm on both the x- and y-
axes. The actual number of plotter units per millimeter is approximately 40.
OH [Output Hard-clip limits]
This instruction returns the lower left and upper right limiting coordinates of the plot
area, in the following format:
X
LL, YLL, XUR, YUR TERM
LL: lower left
UR: upper right
Error Number Description
0 No error
1 Instruction not recognized
2 Wrong number of parameters
3 Illegal parameter
4 (Reserved)
5 Unknown character set
6 Plot position overflow
7(Reserved)
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