Simphoenix DL100 Series - MODBUS Protocol Specification; Communication setting; Communication function; Protocol format

DL100 Series Universal Low-Power Inverter
62 MODBUS Protocol
Appendix I: MODBUS Protocol Specification
1. Communication setting
The protocol is MODBUS RTU.
2. Communication function
Complete communication between upper machine and inverter, including
sending operation command to inverter, setting running frequency, rewriting
function code parameter, reading running status of inverter, monitoring
parameter, fault message and function code parameter.
3. Protocol format
MODBUS RTU format
ADU
＞3.5
character
transmission
interval
Slave
machine
address
Function
code
Data
CRC
check
＞3.5 character
transmission
interval
PDU
3.1 Interpretation of protocol format
1. Slave address
0 is broadcast address and the slave address can be set as 1-127.
2. PDU part
(1) Function code 03: Read functional parameters, running status, monitoring
parameter and fault message of multiple inverters,and 6 inverter parameters with
continuous address at most in one time.
Sent by main machine:
PDU PART
03
Register initial address
Number of registers
High
Low
High
Low
Data length(Byte)
1
1
1
1
1
Slave machine response:
PDU PART
03
Number of reading bytes
(2*Number of registers)
Reading content
Data length(Byte)
1
1
2*Number of registers
(2) Function code 06: Rewrite operation command, running frequency and
functional parameter of single inverter.
Sent by main machine:
PDU PART
06
Register initial address
Register data
High
Low
High
Low
Data length(Byte)
1
1
1
1
1