Ebyte E851-RTU Series User Manual page 29

Chengdu Ebyte Electronic Technology Co., Ltd.
Device functi
ModBus on
address code
take 01
over Device ModBus address
Modbus TCP protocol writes WAN port parameters:
00 01 00 00 00 4B
sen
d
Trans
Protoc
missio length
ol ID
n ID
00 01 00 00
take
Transmissi Protocol
over
on ID
4.4.7 DNS settings
There are 22 registers starting 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 the preferred DNS, and registers 0xD4 to 0xDD store the ASCII
code value of the preferred DNS address. Register 0XDE stores the length of the standby DNS address, and 0XDE to 0XE8 store the
ASCII code value of the standby DNS address.
You can use the 10 function code to configure the preferred DNS and standby DNS at one time. The following table shows that
the preferred and standby DNS are 61.139.2.69 and 192.168.4.1 respectively.
Modbus RTU protocol configuration preferred and alternate DNS :
01 10
send
Device functi
ModBus on
address code
take 01
over
Device ModBus address
Modbus TCP protocol configuration preferred and alternate DNS :
se
00 01 00 00 00 33
nd
Copyright © 2012, Chengdu Ebyte Electronic Technology Co., Ltd.
register
address Bytes
length
10
function code
00
01 10
B1
Unit functio addr
ID n code ess
00 06 01
length Unit ID
ID
00 D3 00 16 2C
register
address Bytes
length
10
function code
00
01 10
D3
38 2E 34 2E 31 00 00 00 00 00 00 00 00 00
write value
00 B1
address register length
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
00 22 44 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
register Byte
length s
10
function code
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 00 000
write value
00 D3
address register length
00 0B 36 31 2E 31 33 39 2E 32 2E 36 39 00 00 00
00 16 2C
00 00 00 00 00 00 00 0B 31 39 32 2E 31 36 38 2E
E851-RTU(4440-ETH) User Manual
00 22 10 37
CRC check code
00 00 00 00
write value
00 B1 00 22
address register length
00 16 B0 3E
CRC check code
CRC
check
code
D9 F2
CRC
check
code
29