Timing Characteristics And Fill Characters; Terminet 300 Printer - GE GEK-36150 terminet 300 Operator's Manual

GEK-36150 Operating Characteristics
TIMING CHARACTERISTICS AND FILL CHARACTERS
Because certain non-printing operations (for example, Line Feed) require a finite amount of time, data being printed
must be delayed so that it will not be lost when the non-printing operations occur. Also, an operation must be
delayed, such as motor off, so that characters in memory can be printed. These time delays can be provided by using
11
fill
11
characters. In general, a
11
fi11
11
character can be defined as any character in the ASCII code that does not cause
an equipment action but takes time to process. The Time Delay and
11
Fifl
11
Character Tables list those operations
that require a time delay, the associated time, and the number of
11
fill
11
characters req1:1ired if used.
In the following text of this section, a description is given on how the Printers are used with the TermiNet Cassette
Accessory and Paper Punch and Reader regarding fill characters. Many of the necessary delays are provided
automatically and some delays can be obtained by methods other than using the number of
11
Fi11
11
characters
specified in the table.
NOTE
The following text shows various examples of how fill characters are used.
In these examples, the following symbols will be used:
TermiNet 300 PRINTER
B Backspace
C - Carriage Return
F Form Feed
L - Line Feed
V · Vertical Tabulation
# - Fill Character
The following chart summarizes the time interval and
11
fill
11
character requirements for the TermiNet 300 Printer.
The following text gives examples of how
11
fill
11
characters are used.
NORMAL SINGLE LINE FEED
The time delay required from the last character on a line until the first character on the next line is 300 milliseconds.
This time includes the CR, LF characters and the time to decode the first character on the new line. Since at 300
baud each character time is 33.3 milliseconds, 300/33.3 equals nine character times for the required 300 millisecond
delay. To produce this delay, use six fill characters in addition to the CR, LF codes and the first character on the
new line.
Example One: (300 Baud)
Line 1: The TermiNet 300 Data CommunicationCL######
Line 2: Printer Operates at 30 CharactersCL######
Line 3:
Per Second
CONSECUTIVE LINE FEEDS
If there are to be consecutive line feeds after a line of printing, a time delay of 350 milliseconds is required for the
initial double line feed and 67 for each additional line feed. The 350 millisecond delay may
be
provided by eight fill
characters (350/33.3 equals eleven characters less CR, LF, LF) and the subsequent 67 millisecond delay requires 2
fill characters (67 /33.3 equals two characters).
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