Epson STYLUS 870 Programming Manual page 43

Run-length encoding compression mode
In run-length encoding compression mode, the data is transferred in the following
format.
The data to be printed is always transferred in the format (counter) + (data).
If 0 counter 127, then the data following the counter is non-compressed data, and
the length of the compressed data is (counter)+1 bytes.
If 128
compressed data, and the compressed data is to be considered as being repeated
257-(counter) times.
3) The printing position in the X direction is set to a position spaced in the positive
direction from the present printing position in the X direction by (256 x nH + nL)
x h/3600 inches.
If this command specifies a position in the non-printable area (right margin), the
right margin position is set once again to the X direction print position.
4) If image data upon a non-printable region is designated, this designated data is
ignored.
The combinations of printing density and command parameters which can be set with the raster
graphics of this printer are shown in the following tables:
0.
Case of microweave mode off
Mode Parameter
(V x H) c
120x120 0/1
120x360 0/1
120x720 0/1
180x180 0/1/2
180x360 0/1
360x360 0/1/2
1. Case of microweave mode on
Mode Parameter
(V x H) c
360x360 0/1/2
720x720 0/1/2
*1 When mode is selected as TIFF(c=2), only m=1 is allowed.
*2 The parameter m=1 is recommended.
*3 In the case that the ESC . command is used only MultiShot Dot (ESC ( e 2 0 0 0) is effective.
Initial State:
Character mode
EPSON Imaging Technology Center
Revision: 1
counter 255, then the data following the counter is one byte of
v h m
30 30 48
30 10 47/48
30 5 47/48
20 20 1/8/24
20 10 1/8/24
10 10 1/8/24
v h m
10 10 1
5 5 1
ESC(e *3 Comment
n2
00h expanded to 120x360 by the
printer
00h
00h
00h *1 *2
00h *2
00h *1 *2
ESC(e *3 Comment
n2
00h
00h 2pass printing
Page: 43
10/6/00