Installation guide

customizations in backups. Using a file name prefix for new or modified
PCF files will prevent potential file name conflicts. For example, copy file
names before customizing as follows:
#cp ln17.pcf my_ln17.pcf
The print filter is located in /usr/lbin and the PCF printer specific files
are in /usr/lbin/pcf. The file template.pcf provides documentation on
the PCF file format.
10.7.5 Flag Bits
Flag bits specify characteristics about data transmission from the host to
the printer and, if possible, from the printer to the host on a serial line only
(LAT and RS232). Data that is passed from the printer to the host may
include stop and start status information, which tells the host that the
printer input buffer can accept input or that it is about to overflow.
Delays are specific times used to slow the transmission of the next group of
characters to the input buffer. Delays give the printer mechanism time to
perform operations such as a carriage return, newline, tab, and form feed.
Flag bits are cleared with the fc symbol and set with the fs symbol. All
printers do not use all the flag bits, but you must either set the bits or clear
them. You should consult your printer manual for specific information
about flag bits.
The flag bits are specified as octal numbers in a 16-bit word. Octal values
are preceded with the number zero (0). To clear all the bits, specify the
value 0177777 with the fc symbol. To set all the bits, specify the value
0177777 with the fs symbol. All bits should be cleared (using
fc#0177777) before calling the fs symbol. To set or clear any groups of
bits, specify the octal sum of the combined bits for the number of flag bits.
The following is an example of flag bit specifications:
fc#0177777
fs#0141
As shown in the previous example, fc#0177777 clears all bits. The fs
symbol set to 0141 specifies the OPOST, ONLRET, and OFILL flag bits.
Table 10–6 lists each flag bit name, its octal value, and its description.
Administering the Print Services 10–27