Siemens SICAM P20, Manual, Page: 30 / 38

Communication
6.2.2 Function of Application Layer
SICAM P20 P21 P22, 3-phase Current Power Meter, User Manual
E50417-H8940-C558-
4
, Release Date
06.2018
30
6.2.2 Function of Application Layer
Read Data Command (function code 03 H)
• Down frame format
• Response frame format
• Example
- Down frame of 3-phase voltage data read
- Response frame
Preset Multi-Register Command (function code 10 H)
• Down frame format
• Response frame format
• Example
- Down frame when CT conversion ratio is 1234.5678 (hexadecimal notation of 12345678: 00BC 614EH)
- Response frame
Communication
address (0-247)
Function
code
(03 H)
High byte of
start address
of data
Low byte of
start address
of data
High byte
of length
of data
Low byte of
length of
data
Low byte
of CRC
High byte
of CRC
Communication
address (0-247)
Function
code
(03 H)
Number of
bytes of data
length
Content of
data
Content
of data
Content of
data
Low byte of
CRC
High byte of
CRC
Device address 03 H 10 H 00 H 00 H 03 H Low check High check
Device address 03 H 06 H Data 1 Data 2 ... Low check High check
Device
address
0-247
Func-
tion
code
(10 H)
High byte
of start
address
of vari-
able
Low byte
of start
address
of vari-
able
High byte
of vari-
able
number
Low
byte of
variable
number
Byte
n of
data Byte
1 of
data Byte
of
data Byte
n of
data Low
byte of
CRC
High
byte of
CRC
Device
address
0-247
Func-
tion
code
(10 H)
High
byte of
start
address
of vari-
able
Low byte
of start
address
of vari-
able
High
byte of
variable
number
Low
byte of
variable
number
Byte
n of
data Byte
1 of
data Byte
of
data Byte
n of
data Low
byte of
CRC
High
byte of
CRC
Device
address
10 H 00 H 05 H 00 H 02 H 04 H 00 H BCH 61 H 4EH Low check High check
Device address 10 H 00 H 05 H 00 H 02 H Low check High check