Tally Dascom 7106Series, Руководство программиста

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1-2
1.1 Outline
Generally, when labels of graphics and bar codes are printed by a
line printer, print data is converted into bit map data in the computer and
transmitted to the printer for printing. In this process the host computer
has to generate the bit map data and send it to the printer, this reduces
throughput leading to slow printing and host computer operation.
This printer incorporate many functions such as a variety of fonts, bar
code generators, and graphic commands along with high speed
processing, so high-quality labels can be printed easily at high speeds
when simple commands are transmitted from the host computer. The
computer processing in generating labels is reduced enabling it to
undertake more processing.
1.2 Outline of Command System
Commands for this printer consist of a string of ASCII characters and
end with a "CR" (decimal: 13, hex: 0D). Generally, commands are
classified into two types, that is, system level commands and label format
commands.
System level commands are used in system level operations,
including printer output, sensor selection and memory maintenance.
Label format commands are used in the definition of printing contents
such as character data, bar code data, printing speed, and print density.
System level commands start with ASCII "SOH" ($01) or ASCII "STX"
($02).
Commands that start with “SOH” are requested for the real-time
execution. When received, they are executed immediately even during
printing. Commands that start with “STX” enter the buffer area and are
executed in the order of data reception.
Label format commands follow the system level commands' "STX" +
"L" and end with a "CR."
(For details, see 1.3 Outline of Interpreter and 1.4 Outline of Label
Format Data.)