Set Network Protocol Parameters - Ebyte E821-RTU User Manual

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Device ModBus
address
01
Receive
Device ModBus
address
Modbus TCP protocol write register:
00 01
Send
Transmission Protocol
identifier identifier
00 01
Receive Transmission
identifier
Note: 3D 8B 02 45 is preferred DNS server address, C0 A8 04 02 is Alternate DNS server address.

4.3.6 Set network protocol parameters

Modbus RTU protocol write DNS register:
01
Send
Device ModBus
address
01
Receive
Device ModBus
address
Modbus TCP protocol write register:
00 01
Send
Transmission Protocol
identifier identifier
00 01
Receive Transmission
identifier
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Function
Address
code
10
Function
code
00 00 00 0F 01
Unit
Length
identifier
00 00 00 0F
Protocol
Length
identifier
10 00 81
Function
Address
code
10
Function
code
00 00 00 0F 01
Unit
Length
identifier
00 00
Protocol
identifier
Register Number
length of bytes
00 79
Address Register length
10 00 79
Function
Address
code
01
Function
Unit identifier
00 04 08
Register Number
length of bytes
00 81
Address Register length
10 00 81
Function
Address
code
00 0F 01
Length Unit identifier
E821-RTU (0400-ETH)User Manual
CRC check
Write value
00 04 10 13
CRC check code
3D 8B 02 45
00 04 08
C0 A8 04 02
Register Number
Write value
length of bytes
10 00 79
Address
code
00 00 C0 A8 04 0A 22
B6
Write value
00 04 91 E2
CRC check code
00 00 C0 A8
00 04 08
04 0A 22 B6
Register Number
Write value
length of bytes
10 00 81
Function
Address
code
code
00 04
Register
length
81 3B
CRC check
code
00 04
Register
length
21 21