Shihlin electric SL3 Series, User Manual

Page: 123 / 211

Communication parameter group 07
PARAMETER DESCRIPTION 119
ACK
Inverter station
number 0
CR
H06 H30 H30 H0D
Example 5. Write 600 into 01-28(P.162) (this parameter range is set from 0 to 599.00)
Step 1~2 are the same as Step 1~2 of Example 3;
Step 3: Upper controller requests inverter to write 600 in 01-28(P.162) in Format A:
ENQ
Inverter station
number 0 Reference
code HDE
Waiting time
Data
HEA60 SUM
CHECK
CR
H05 H30 H30 H42 H45 H30 H45 H41 H36 H30 H30 H33 H0D
Step 4: After receiving and processing the data, the data exceed the range of 01-28(P.162), so data range is
incorrect. Inverter will reply error to upper controller in Format D：
NAK
Inverter station
number 0 Error code
H0C
CR
H15 H30 H30 H43 H0D
Note: In above examples, parameters 01-28 (P.162) reading and writing are all using P parameter mode. To use
parameter group mode, please note the difference between page number and parameter number. Please refer to
the communication command list for relevant contents.

MODBUS communication protocol

Message format
MODBUS serial transmission can be divided into two types: ASCII (American Standard Code for Information Interchange) and
RTU(Remote Terminal Unit)
Query Msssage
Upper controller
（
Master
）
inverter
（
Slave
）
Single
communication
Response Message
ASCII
：
CR
、
LF
RTU
：
silent period
>=10ms
Inverter response time
Query Messsage
Upper controller
（
Master
）
Inverter
（
Slave
）
Broadcast
communication
No Response
(1) Query
Upper controller (master address) sends data to Slave (slave address) with specified address.
(2) Normal Response
After receiving the query from Master, Slave will execute requested function and ask Master to send normal response.
(3) Error Response
When receiving wrong function codes, address or data, inverter will send this response to Master.
(4) Broadcast
After Master specifies address 0, it can send data to all Slave. All Slave that received Master data will perform the
requested function but will not return a respond to Master.