DekTec DTM-3200 IP-ASI Converter - Manual (Page 43)

DTM-3200 – OEM Ethernet TSoIP Converter
User Manual
43
Figure 13 is the reply-sequence that may be executed after the read-command of Figure 12. After
addressing this device, the bytes from the command are repeated followed with the 4-byte
IP address.
Figure 13: Read subnet-mask reply
The reply consists of the following bytes:
 Address and I 2 C write-bit (0x12 and ‘1’)
 Category byte (0x03)
 Setting byte (0x02)
 Read byte (0x01)
 Four IP-address bytes (decimal 192.168.100.13 or hexadecimal C0.A8.64.0D)
 Checksum (0x0F, see Table 2)
Table 2: Checksum computation
Command Reply
Address 0x12 0x12
Category 0x03 0x03
Setting 0x02 0x02
R/W ‘1’ ‘1’
Data byte 3 - 0xC0
Data byte 2 - 0xA8
Data byte 1 - 0x64
Data byte 0 - 0x0D
Sum: 0x18 0x1F1
Checksum: 0xE8 0x0F