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DTM-3200 – OEM Ethernet TSoIP Converter
User Manual
Serial read command
Figure 10 shows the read command of the device type number (category 1, setting 5, no index). A
index is not required for this category and the returned data consists of 4 bytes (int32). All values
displayed as ASCII characters.
The command consists of the following parts:
Start character 'STX'
Two hexadecimal address characters ("12")
Two hexadecimal category characters ("01")
Two hexadecimal setting characters ("05")
A read character 'R'
Two hexadecimal checksum characters ("85")
End character 'ETX'
Figure 11 shows the two possible replies from the command in Figure 10. The replies are similar t
the commands with the exception of the data-characters or the read character. On a suc
command, the reply-data is set to the corresponding data (0x00000C80). When the receiv
command cannot be executed, the read character is set to the ASCII character 'E'. In both cases t
checksum is also updated.
2
I
C read command
Figure 12 shows the communication sequence used to issue a read subnet mask comman
(category 3, setting 2, no index). An index is not required for this category and the returned data
consists of an IP-address.
The command consists of the following bytes:
Address and I
2
C write-bit (0x12 and '0')
Category byte (0x03)
Setting byte (0x02)
Read byte (0x01)
Checksum (0xE8, see Table 2). The checksum is computed with the address and without the
2
I
C write-bit.
Figure 10: Read-command for the device type setting
Figure 11: Reply after a device type read-command
Figure 12: Send subnet-mask read-command
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