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With unformatted printouts, the print orders that were sent in the data stream
control the printed data format. The printer orders and their hexadecimal values are
shown in Table 4-4.
Table 4-4. Print Orders and Hex Equivalents
Order
New Line (NL)
Hex Value
X'15'
X'19'
X'OD'
X'OC'
End of Message (EM)
Carriage Return (CR)
Form Feed (FF)
The
3708
stores these orders in the device buffer after setting the two high order bits
to b' 11'. (This setting causes the characters to appear as X' D5' , X' D9' , X' CD' ,
and X'CC' in the buffer.) As data in the buffer is converted to a data stream for
transmission to the printer, these bytes are interpreted as print orders. The printout
format that results is described in the following paragraphs.
Note: The newline function referred to below has three steps:
1. Carriage Return (X' OD ').
2. Line Feed (X' OA ').
3.
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.
A newline function is performed by the
3708
when a Begin Bracket is received for
the printer session.
Note: This newline can be suppressed by configuring the
3708
option PERFORM
NEWLINE AT BEGIN BRACKET to N.
New Line (NL):
When an NL order is encountered in the buffer, the
3708
performs
a newline function to advance the printer element to the left margin of the next line.
Also, if no NL is encountered before the end of the line (as determined by the platen
length), the
3708
performs the newline function.
If the NL order is encountered in a nondisplay/nonprint field, it does not cause a
newline function; a blank is sent to the printer.
End Of Message (EM):
The EM order is used to indicate the end of a message.
When the EM order is encountered in the buffer, the
3708
resets the printer element
to the start of the next line by performing a newline function. If the printer is
already at the start of a line, the newline is not performed.
If the EM order is encountered in a nondisplay and nonprint field, it does not end
the printout; a blank is sent to the printer.
If a valid EM order is not encountered during the printout, the
3708
transmits NLs
for all null lines until it reaches the end of the print buffer.
Chapter 4. Protocol Conversion Mode
4-17
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