HP PCL/PJL reference - PCL 5 Comparison Guide

ENWW Printer-Specific Differences 2-37

Segment Identifier Values

The Segment Identifier Values for the Galley Character, Vertical

Substitution Character, Typeface String, Vertical Rotation, and

Character Enhancement Segments are as shown in the following

table.

Data Segment Size

The Data Segment Size indicates the number of bytes in the

immediately following Data Segment. The size of this field is 4 bytes

for Font Format 16 fonts, and 2 bytes for Font Format 15 fonts. The

rest of the data segments are identical for both font formats.

Galley Character Segment

If an application requests a character that does not exist within the

current font, the printer checks the Galley Character Segment for a

substitute character to print instead. The Galley Character Segment

specifies the character codes of the substitute characters to be

printed. A different galley character can be specified for different

regions of the symbol set. For example, this segment can be set up

so that an asterisk prints when a non-existent character is selected in

the region 0x81 - 0x9F, and a question mark for characters in the

region 0xE0-0xFC.

Value Mnemonic* Data Segment

18243 GC Galley Character Segment

22100 VT Vertical Substitute Segment

21574 TF Typeface String Segment

22098 VR Vertical Rotation Segment

17221 CE Character Enhancement Segment

* The mnemonic is obtained when the two bytes of this big-endian word are treated as

ASCII characters.

Byte 15 (MSB) 8 7 (LSB) 0 Byte

0 GC (18243) 1

Data Segment Size (6*n+6) * 3

6Format = 0 7

8 Default Galley Character 9