Chapter 7 Emulation
7-106
OW [Output Window]
This instruction returns the x- and y-coordinates of two diagonally opposite corners of
the current plottable area. Four ASCII-coded integers indicating the lower left and upper
right corner coordinates are returned by using the following format:
X
LL, YLL, XUR, YUR, TERM
LL: lower left
UR: upper right
Device-Control Instructions
KC-GL uses device-control instructions to return buffer status information and other sta-
tus information from the printing system via the RS-232C interface. Status information
cannot be output on the parallel interface. If device-control instructions are received via
the parallel interface, they are ignored.
The device-control instructions for status output appear below.
Output Buffer Space (ESC.B)
This instruction returns 0 if the receive buffer is full, and 1024 if the receive buffer is
empty.
Output Extended Error (ESC.E)
This instruction normally returns 0, if an error has not occurred, and returns 15 if a fram-
ing error, parity error, or overrun error has occurred.
Output Buffer Size Label (ESC.L)
This instruction always returns the value 1024.
Output Extended Status (ESC.O)
This instruction returns printing system status information regarding:
• On-line status
• Cover open
• Paper empty
• Paper jam
• Buffer full
The following table describes this status information.The paper feed source is the inter-
nal cassette at all time. A complete list of device-control instructions appear in Device-
Control Instructions on page 113.
Table 7.31. Status Information
Response Description
1 The buffer is full.
9 The buffer is empty (normal).
17 The buffer is full and the printing system is off-line.
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