Chapter 7 — Commands
ESim for the PC4 and PF8 Printer Programmer’s Reference Manual 79
The result is the printout shown below:
GRP - Reply Graphics From Print Buffer
Purpose: This command is used to dump part of the printer buffer back to
the host via the serial port.
Syntax: GRPp
1
,p
2
,p
3
,p
4
[,p
5
]
.
Remarks: This command is the reverse of the GW command and can be
used to verify that data has been rendered correctly. What part of
the print buffer is sent back to the host is specified by the the
parameters p
1
-p
4
above, and the format of this data by p
5
.
GRP Command Parameter Descriptions
Parameter Description
p
1
X-position in printer dots
p
2
Y-position in printer dots.
p
3
Number of bytes across the graphic
(8 dots = 1 byte).
p
4
Number of dot rows going down the graphic.
p
5
Parameter setting the format of the data. Allowed
values are:
B = Binary, not inversed.
b = Binary, inversed (default).
H = Hexadecimal, not inversed.
h = Hexadecimal, inversed.
Note: There is no flow control or handshaking when sending this
data to the host, so use this command only for small areas.
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