Chengdu Ebyte Electronic Technology Co.,Ltd
E851-RTU(4440-ETH) User Manual
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co.,Ltd
31
Transmit
00 01
00 00
00 4B
01
10
00 B1
00 22
44
00 01 00 0D 31 39 32 2E 31 36
38 2E 34 2E 31 30 31 00 00 00
00 00 00 00 00 0D 32 35 35 2E
32 35 35 2E 32 35 35 2E 30 00
00 00 00 00 00 00 00 0B 31 39
32 2E 31 36 38 2E 34 2E 31 00
00 00 00 00 00 00 00 00
Transmission
identifier
Protocol
identifier
length
element
ID
function
code
address
Register
Length
Bytes
Write value
Receive
00 01
00 00
00 06
01
10
00 B1
00 22
Transmission
identifier
Protocol
identifier
length
element ID
function code
address
Register Length
4.4.7. DNS settings
There are 22 registers from 0XD3 to 0XDE, which store DNS information. DNS addresses are divided into preferred DNS and standby
DNS. Register 0xD3 stores the address length of preferred DNS, and 0xD4 to 0xDD stores the address ASCII code value of preferred
DNS. Register 0XDE stores the length of the standby DNS address, and from 0XDE to 0XE8 stores the ASCII code value of the
address of the standby DNS.
The preferred DNS and standby DNS can be configured with 10 function codes at one time. The table below shows the configuration
preferred and alternate DNS are 61.139.2.69 and 192.168.4.1 respectively.
Modbus RTU protocol configuration preferred and standby DNS:
Transmit
01
10
00 D3
00 16
2C
00 0B 36 31 2E 31 33 39 2E 32 2E 36 39 00 00
00 00 00 00 00 00 00 00 0B 31 39 32 2E 31 36
38 2E 34 2E 31 00 00 00 00 00 00 00 00 00
D9 F2
Device ModBus
address
function
code
address
Register
Length
Bytes
Write value
CRC
check code
Receive
01
10
00 D3
00 16
B0 3E
Device ModBus address
function code
address
Register Length
CRC
check code
Modbus TCP protocol configuration preferred and standby DNS:
