migra MPB CAN
Large Format Graphics Compatible LED Display with CANopen Interface
Page 13
microSYST Systemelectronic GmbH, Am Gewerbepark 11, 92670 Windischeschenbach
+49 9681 91960-0,
+49 9681 91960-10, [email protected], www.microsyst.de
3.6.2 Data-Unit
Data Unit
Display Data
1B
h
, 0A
h,
0D
h
, 20
h
-FF
h
Data Unit:
data bytes (ASCII characters, control commands)
3.6.3 Trail
If bit 1 is
not
set in the FC byte (do
not
use checksum):
ETX
End of Text
00000011
b
(03
h
)
End of Text:
03
h
.
If bit 1 is set in the FC byte (use checksum):
CHK-H
CHK-L
ETX
High nibble from sum of all
previous bytes
(without STX)
Low nibble from sum of all
previous bytes
(without STX)
End of Text
1111XXXX
b
(FX
h
)
1111XXXX
b
(FX
h
)
00000011
b
(03
h
)
Checksum = low byte for sum of DA, SA, FC, LEN-H, LEN-L and
all data bytes
CHK-H:
High nibble for checksum: bits 3 through 0,
bits 4 through 7 must be set (1).
CHK-L:
Low nibble for checksum: bits 3 through 0,
bits 4 through 7 must be set (1).