LSIS XBE-DC08A, User Manual, Page: 1036 / 1284

Chapter 2 Built-in Cnet communication
2-38
B
u
ilt
-in
C
omm
(3) Structure of BODY
Input type of segment which composes BODY is different according to reception and transmission.
In case of transmission, they are divided into string constant, numerical constant and fix sized variable. Meaning of
string constant and numerical constant is same with HEAD’s.
a) Variable sized variable (in RX frame)
Part where size and contents changes are defined as variable sized variable. Variable sized variable can be set in
the BODY and after variable sized variable, the user can’t add segment. When using variable sized variable, there
should be one among HEAD, TAIL. If the user registers variable sized variable without HEAD, TAIL, when
receiving frame, there may be error according to communication status. For reliability of communication, register
one among HEAD, TAIL. (In case of Variable sized variable of TX frame, the size is designated in P2P Block
setting, so the function and characteristic is same with Fix sized variable of RX frame.)
b) Fix sized variable (in RX frame)
Frame part where size is fixed but contents changes are defined as Fix sized variable. It can be set in the BODY. In
case of Fix sized variable, the user can register up to 4.
TRX frame standard for user - defined communication of XGB Cnet I/F module is as follows.
Group Frame Segment Reference
TX
frame
HEAD
Numerical constant Max. 10 byte
String constant Max. 10 byte
TAIL
Numerical constant Max. 10 byte
String constant Max. 10 byte
BCC Only one BCC applicable
BODY
Numerical constant Max. 10 byte
String constant Max. 10 byte
Variable sized variable Available up to 4
RX
frame
HEAD
Numerical constant Max. 10 byte
String constant Max. 10 byte
TAIL
Numerical constant Max. 10 byte
String constant Max. 10 byte
BCC Only one BCC applicable
BODY
Numerical constant Max. 10 byte
String constant Max. 10 byte
Fix sized variable
Available up to 4
Fix sized variable 3, variable sized variable 1 are
available
Variable sized variable
Only one variable sized variable available
After variable sized variable, adding segment is
impossible