Siemens SIMATIC NET CP 243-2 Manual page 84

Command Interface
5.2.4 Read_Parameter
Purpose
This call returns the current parameter value (actual parameter) of a slave.
This value must not be confused with the parameter echo that is supplied by the
AS-i slave as a reply to the write_parameter job.
Structure of the Job Data in the Send Buffer
Bank Byte
2 0
2 1
Structure of the Job Data in the Receive Buffer
Bank Byte
2 0
2 1
2 2
5-16
Command number: 03
AS-i slave address
Bit 7
Echo of the command number: 03
Command status
irrelevant
Meaning
H
Meaning
Bit 4 Bit 3
H
Parameter
SIMATIC NET CP 243-2 AS-i Master
C79000-G8976-C142/02
Bit 0