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Back Space (8S)
The Back Space (BS) is a format control that moves the print position horizontally
one position to the left. If the print position is at column 1, this control has no
effect. The left margin setting is ignored.
To execute this command, the 3708 sends XLATE (X '16') to the printer.
Carriage Return (CR)
The Carriage Return (CR) is a format control that moves the print position
horizontally to the left margin on the current line.
If
the print position is already at
the left margin, this command has no effect.
To execute this command, the 3708 sends:
1.
XLATE (X'OD')
2. If a carriage return delay is specified for the port to which the printer is
attached, a number of ASCII DEL characters (X'7F') are sent to the printer.
The number of DEL characters is determined by multiplying the configured
carriage-return-delay value by the ratio of
the
current column to the platen
width.
3. If the left margin (LM) is currently greater than
1,
then LM minus
1
number of
ASCII space characters (X' 20 ') are sent.
Enable Presentation (ENP)
Form Feed (FF)
The Enable Presentation (ENP) is a format control that is used to enable the
printing of keyboard input data. This command performs no function on an LU
type 1 device.
It
is accepted by the 3708 without an error response and without
affecting the printout format.
The Form Feed (FF) is a format control that moves the print position to the top
and left margin of the next form.
To execute this command, the 3708 sends four or more characters to the printer.
1.
The first character depends on the value of
3708 MAY TRANSMIT FORMFEED (LU_l
SCS).
• If
the value is Y, the 3708 sends XLATE (X'OC') to cause a form feed.
• If
the value is N, the 3708 sends the following characters:
a. XLATE (X' OD ') to perform carriage return functions
b. CR delay (same as 2 under "New Line (NL)" on page 4-21)
c. An appropriate number of ASCII line feed characters (X' OA ') to
position the print element on the first line of the next form.
2. If a form-feed delay is specified for the port to which the printer is attached, a
number of ASCII DEL characters (X '7F') are sent to the printer. The number
of DEL characters is equal to the form-feed delay value.
Note: Instead of DEL (X' 7F') characters, the user may configure the 3708 to
transmit NULL (X'OO') or XON (X'llX') by setting nonstandard bits 4 or
10
to 1.
4-20
IBM 3708 Description
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