Clear The Cache; Set Keep-Alive Parameters - Ebyte E821-RTU User Manual

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address
01
Receive
Device ModBus
address
Modbus TCP protocol write register:
00 01
Send
Transmission
identifier
00 01
Receive
Transmission
identifier
Note: 00 00 is the heartbeat packet time. 00 00 means to turn off the heartbeat packet, the value cannot be 1, and the
range is 2-65535.

4.3.12 Clear the cache

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
Note: 00 00 indicates that the cached data of the SOCKET A1 link is not cleared. 00 01 indicates that the cached
data of the SOCKET A1 link is cleared, but the serial cache data is not cleared.

4.3.13 Set keep-alive parameters

Modbus RTU protocol write register:
Send 01
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code
06
Function
code
00 00 00 06
Protocol
Length
identifier
00 00 00 06
Protocol
Length
identifier
06
Function
code
06
Function
code
00 00 00 06
Protocol
Length
identifier
00 00 00 06
Protocol
Length
identifier
10 01 4F
01 41
Address
01 06
Unit Function
identifier code
01 06
Unit Function
identifier code
01 49
Address
01 49
Address
01 06
Unit Function
identifier code
01 06
Unit Function
identifier code
00 03 06
E821-RTU (0400-ETH)User Manual
01 AA 59 CD
Write value CRC check code
01 41 01 AA
Address Write value
01 41
Address Write value
00 00
Write value CRC check code
00 00
Write value CRC check code
01 49
Address Write value
01 49
Address Write value
02 D1 02 D1 00
31
01 AA
59 E0
59 E0
00 00
00 00
BD 3D
25 25