Homelite HL-1270N, HL-P2500, HL-1660E, HL-2400CE, HL-1450, HL-1050, HL-1250, HL-1470N, 2060 File Length

10/10/03

<Second section 66 66 66 66>

Offset count = 2

Replacement count = 4

Replacement data = 66

7	6	5	4	3	2	1	0
1	1	1	0	0	0	0	1	Optional offset count byte = 0

Replacement data = 11

Replacement count = 1 + 2 = 3
Offset count = 3
7		6	5	4	3	2	1	0
	1	1	0	0	0	0	1	0	Replacement data = 66

Replacement count = 2 + 2 = 4

Offset count = 2

•# = 1152 indicates that CCITT G3/G4 data compression is to be used.

This format is popular in optical document storage areas as this compression is effective to store black and white type pictures. As G3/G4 format does not have picture size/resolution information, the printer requires a header at the beginning of the picture data. The header size is 94 Bytes. Both the header and the picture data are transferred by the ESC*b###W(###=data length) command. The normal PCL transfer graphics data command has a limitation on the data size and ### should not exceed 32767. Unlike other modes, this mode is special and does not have the 32767 size limitation. The data must have the following structure - Header and Picture data. The values in this mode are little endians.

Header

Picture data

94 bytes

File Length

Picture data length

Byte	Data	Description
position
0 - 1	6E 6E	'nn' This is header ID.
2 - 3	0A 00	Reserved
4 - 7	5E 00 00 00	Picture data start offset from header top
8 - 11	File length	File length including 94 Byte header. If file length is 65,536 byte,
		these 4 bytes become "00 00 01 00"
12 - 13	01 00	Reserved
14 - 15	01 00	Reserved
16 - 19	4A 00 00 00	Reserved
20 - 21	Compression mode	02 00: Fax MH format
		03 00: Fax MR format
		04 00: Fax G4 format
22 - 55	00 ... 00	All zero
56 - 59	Picture data length	If picture data length is 65,442 (65,536 ~-94) byte, these 4 bytes
		become "A2 FF 00 00."
60 - 61	01 00	bit / pixel
62 - 63	01 00	bit / pixel
64 - 65	Pixels/line	If picture dot width = 2,400, these 2 bytes become "60 09"
66 - 67	Pixels/line	Same as above.
68- 69	Lines/picture	If picture dot count = 3,100, these 2 bytes become "1C 0C."
71 - 71	Lines/picture	Same as above.

CHAPTER 2 "PCL" - 80