Set Local Port Number - 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
identifier
00 01
Receive Transmission
identifier
Note: 02 D1 indicates that if there is no data message transmission after the TCP link, the detection message will be
started. 00 00 indicates that the keep-alive function is turned off, with a value of 2-7200 seconds. 02 D1 time interval
between the previous detection message and the next detection message is a value of 2-7200 seconds. 00 31 is the
maximum number of detection failures. When the number of sniffing failures reaches this number, the TCP connection
will be disconnected, with a value of 2-255 times.

4.3.14 Set local port number

Modbus RTU protocol write register:
01
Send Device ModBus
address
01
Receive Device ModBus
address
Modbus TCP protocol write register:
00 01
Send Transmission
identifier
00 01
Receive Transmission
identifier
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Function
Address
code
10
Function
code
00 00 00 0D
Protocol
Length
identifier identifier
00 00 00 0D
Protocol
Length
identifier
06
Function
code
06
Function
code
00 00 00 06
Protocol
Length
identifier
00 00 00 06
Protocol
Length
identifier
Register Number
length of bytes
01 4F
Address
01 10 01 4F
Unit Function
Address
code
01 10
Unit Function
identifier code
01 5D
Address
01 5D
Address
01 06
Unit Function
identifier code
01 06
Unit Function
identifier code
E821-RTU (0400-ETH)User Manual
Write value
00 03
Register length CRC check code
00 03 06
Register Number
length of bytes
01 4F
Address Register length
11 A1
Write value CRC check code
11 A1
Write value CRC check code
01 5D
Address
01 5D
Address
CRC check
code
B0 23
02 D1 02
D1 00 31
Write
value
00 03
D4 0C
D4 0C
11 A1
Write value
11 A1
Write value
26 26