Network Configuration Using UDP
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.
9.2.5 Calculating the Two’s Complement
The two’s complement of a number is the value that must be added to the number to reach
a 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.
9.3 Setup Records
A setup record consists of 120 bytes. They are transmitted at once from and to the node.
Unused bytes should be initialized as 00. Table 26 - Setup Record Construction defines the
structure of a setup record:
Table 26 - Setup Record Construction
Byte(s) Function
00-03 IP address of the unit (x.x.x.x)
04 Reserved (0)
05 Flag BYTE
Bit 7: Reserved (0)
Bit 6: Set 1 for AUI, 0 for 10BASE-T (CoBox-Micro only)
Bits 5-0: Reserved (0)
06 Number of host bits for subnetting; if 0, matching standard netmask for Class A,
B, C is used.
07 Reserved (0)
08-11 Telnet configuration password (0 if not used)
12-15 Gateway IP address (0,0,0,0 if not used)
16-63 48-byte Channel 1 parameters; parameter setup Channel 1 (see Table E-4:
Channel Parameters)
64-111 48-byte Channel 2 parameters; parameter setup Channel 2 (see Table E-4:
Channel Parameters))
112-119 Reserved (0)
XPort™ User Manual and Development Kit 9-5
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