The following group codes apply to insert (block reference) entities.
Insert group codes
Group code
Description
100
Subclass marker (AcDbBlockReference)
66
Variable attributes-follow flag (optional; default = 0); if the value of attributes-follow flag is 1, a series of attribute entities is expected to follow the insert, terminated by a seqend entity
2
Block name
10
Insertion point (in OCS)
DXF: X value; APP: 3D point
20, 30
DXF: Y and Z values of insertion point (in OCS)
41
X scale factor (optional; default = 1)
42
Y scale factor (optional; default = 1)
43
Z scale factor (optional; default = 1)
50
Rotation angle (optional; default = 0)
70
Column count (optional; default = 1)
71
Row count (optional; default = 1)
44
Column spacing (optional; default = 0)
45
Row spacing (optional; default = 0)
210
Extrusion direction (optional; default = 0, 0, 1)
DXF: X value; APP: 3D vector
220, 230
DXF: Y and Z values of extrusion direction (optional)