MD‑SI‑DP1 Communication
‑190‑
PKW Data
PKW data is used by the master to read/write to a single parameter of the AC drive.
The communication address of the AC drive parameter is directly determined by the
communication data. The functions of PKW data are as follows:
● Reading function parameters of the AC drive
● Modifying function parameters of the AC drive
Data format
PKW data consists of three groups of arrays, including the PKE, IND, and PWE. The
lengths of PKE and IND are two bytes, and the length of PWE is four bytes. The
following table describes the data format.
PKW Data Sent by the Master
Opera
tion
Com
mand
Parameter Address Reserved
Write: parameter
value
Read: null
PKE PKE IND IND PWE PWE PWE PWE
PKW Data Returned by the AC Drive
Opera
tion
Com
mand
Parameter Address Reserved
Successful: returned
value
Failed: error
information
PKE PKE IND IND PWE PWE PWE PWE
Data description
PKW Data Sent by the Master PKW Data Returned by the AC Drive
PKE
● High‑order 4 bits:
Command code0: No
request1: Read parameter
data2: Modify parameter
data (The preceding
command code is in
decimal format.)
● Low‑order 4 bits: Reserved
● Low‑order 8 bits: High‑
order bits of the parameter
address
PKE
● High‑order 4 bits: Response code0: No
request1: Operation succeeded7:
Operation failed
● Low‑order 8 bits: High‑order bits of
the parameter address
IND
High‑order 8 bits: Low‑order
bits of the parameter address
Low‑order 8 bits: Reserved
IND
High‑order 8 bits: Low‑order bits of the
parameter address
Low‑order 8 bits: Reserved
PWE
High‑order 16 bits: Reserved
Low‑order 16 bits: Parameter
value (write request) or not
used (read request)
PWE
● Request succeeded: Parameter value
● Request failed: Error code (consistent
with standard Modbus)1: Invalid
command2: Invalid address3: Invalid
data4: Other error
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