COBOX-FL-11 Lantronix, COBOX-FL-11 Datasheet - Page 88

• Manufacturer Part Number: COBOX-FL-11
• Description: Ethernet Modules & Development Tools EXTERNAL DUAL PORT
• Manufacturer: Lantronix
• Type: Device Serversr

Specifications of COBOX-FL-11

• Product: Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

UDP
To get and set the node configuration, 120 bytes should be exchanged at once in 32-Byte
records. The IP address in the record (bytes 0 to 3) will be ignored (unless the UDP FD
command is being used).
8.2.4 Calculating the Checksum
A
r
h
T
c
N
E
R
A
R
Data: 02, 33, 7A
Checksum: 1E
03 + 00 + 30 + 00+ 02 + 33 + 7A = E2
The two’s complement of E2 is 1E. See Calculating the Two’s Complement below.
8
The two’s complement of a number is the value that must be adde
Hexadecimal value of 100 (256 in decimal). In the example above, E2 + 1E = 100.
You can also calculate the two’s complement by subtracting the sum from 100. Using the
example above again, 100 - E2 = 1E. It may help to use a scientific calculator.
8-6
ecord represent a checksum of
omplement of
exadecimal va
he checksum is calculated
xample:
.2.5 Calculating the Two’s Complement
ote: Do not include the leadi
ecord length: 03 (3 bytes of da )
ecord Type: 00 (normal da a)
s mentioned in Table 20 - Bloc Typ s above, the last two characters of an Intel Hex setup
ddress: 0030 (the 3 bytes will
0300300002337A1E
lue, it can rep
the sum.
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tored at 0030, 0031, and 0032)
v lue from to 55.
t in t e li . S ce e ch cks m is a two-digit
e
g t e
o he
h
ch
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ue of th
eck um byte in the sum.
0
s
in
2
e d ta o the line and taking the two’s
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CoBox-FL User Guide