Modbus Rtu Protocol Data Frame Description; Modbus Parameter Configuration; Do Register List - Ebyte ME31-AAAX2240 User Manual

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after each communication to distinguish different communication data messages.
 Protocol identifier: 00 00 means Modbus TCP protocol.
 Length: Indicates the next data length, in bytes.
For example：get DI state
01 00
Transaction ID Protocol ID

4.10 Modbus RTU protocol data frame description

RTU frame format：
Device Address
1 Bit
For example：get DI state
01
Device Modbus address

4.11 MODBUS parameter configuration

4.11.1 DO register list

Register
Register function
address
DO state 0x0000
DO power-on
0x0064
state
DO operating
0x0578
mode
DO pulse width 0x05DC
DO follow the
0x0640
source
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00 00 00 06
Length
Function Code
1 Bit
02
Function Code
Register
Quantity
type
Coil
Holding
register
Holding
register
Holding
register
Holding
register
01
Device Address
Data Segment
N Bit
00 00 00 04
Data Segment
Operation Data Range/Remarks
Write to change the
current DO state, read
4 RW
to get the current DO
state
The default state of the
4 RW
coil after power-on
0x0000 level no follow
mode
4 RW 0x0001 pulse no follow
mode
0x0002 follow mode
4 RW Range：50～65535ms
Range：
4 RW 0x0000: follow DI1
0x0001: follow DI2
ME31-AAAX2240_UserManul_EN
02 00 00 00 04
Function Code Data Segment
Check code CRC
2 Bit
79 C9
CRC check code
Related
function codes
R：0x01
W： 0x0F、 0x05
R：0x01
W： 0x0F、 0x05
R：0x03
W： 0x06、 0x10
R：0x03
W： 0x06、 0x10
R：0x03
W： 0x06、 0x10
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