Ebyte E851-RTU User Manual page 21

Chengdu Ebyte Electronic Technology Co.,Ltd
Modbus TCP protocol reads differential analog input:
00 01
Transmit Transmission
identifier
00 01
Receive Transmission
identifier
Function code 0x04, read AI1 input, assuming AI1 input is 9946uA, the corresponding value should be 0x0x26DA
Modbus RTU protocol reads differential analog input:
01
Transmit
Device ModBus
address
01
Receive Device ModBus
address
Modbus TCP protocol reads differential analog input:
00 01
Transmit
Transmission
identifier
00 01
Receive Transmission
identifier
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00 00 00 06
Protocol
length element ID
identifier
00 00 00 05
Protocol
length element ID
identifier
04
Function code Analog Start Address
04
Function code
00 00 00 06
Protocol
length element ID
identifier
00 00 00 05
Protocol
length element ID
identifier
01 03
Function
Analog start address
code
01 03
Function
code
00 10
Read quantity
02
Differential analog input
Return bytes
01 04
Function
code
01 04
Function
code
E851-RTU(4440-ETH) User Manual
00 10
Read quantity
02 26 DA
Input value of
Return bytes differential
analogue
00 01
CRC check code
26 DA
CRC check code
value
00 10
Analog Start
Read quantity
Address
02 26 DA
Differential analog
Return bytes
input value
00 01
30 0F
22 CB
00 01
20