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, info@microsyst.de, www.microsyst.de
3.8.2 Data Unit
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):
End of Text: 03
H
.
If bit 1 is set in the FC byte (use checksum):
High nibble from sum of all
previous bytes
(without STX)
Low nibble from sum of all
previous bytes
(without STX)
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)