migra Ethernet/IP
Large Format, Graphics Compatible Display with Ethernet/IP Interface
Page 17
microSYST Systemelectronic GmbH, Am Gewerbepark 11, 92670 Windischeschenbach
+49 9681 91960-0,
+49 9681 91960-10, [email protected], www.microsyst.de
3.8.2 Data Unit
Data Unit
Display Data
1B
H
, 0A
H ,
0D
H
, 20
H
- FF
H
Data Unit:
Data bytes (ASCII characters, control commands)
3.8.3 Trail
If bit 1 is not set in the FC byte (no checksum):
ETX
End of Text
00000011
B
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
1111XXXX
B
00000011
B
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)