Dascom T2250 User Guide IGP for Dot Matrix Printers - Manual (Page 43)

Chapter 2: Emulations
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Plot Data
Two types of information are needed for plot data. The first is an ASCII character (or numerical
equivalent in whatever base number system your host requires; octal, decimal, hexadecimal,
etc.) that designates which dot pattern you want to print. The second is a one or two byte
numeric equivalent (oct., dec., or hex.) of the number of repetitions of the dot pattern you require.
This information is converted into the following binary equivalents by the host for transmission to
the printer.
Plot Bits
Data 7 6 5 4 3 2 1 0
Dot Pattern Code x 1 d d d d d d
Repeat 1–15 Times x 0 1 0 m m m m
Repeat 16–240 Times x 0 1 1 n n n n
Figure 13 – Plot Data Format
Where:
x = Not used for Plot Data.
dddddd = Binary representation of the desired dot pattern.
0 = no dot
1 = dot
mmmm =Binary equivalent of 1–15 repetitions.
nnnn = Binary equivalent of 16–240 repetitions in multiples of 16.
A sample Dot Pattern Code is shown below. Six bits represent the dot pattern.
Figure 14 – Sample Dot Pattern Code