User’s Manual 7M
35
REQUEST FRAME
RESPONSE FRAME
REQUEST- RESPONSE CYCLE EXAMPLE
Address number of slave: 21
Function code: 04 –> 30000
Starting register HI…LO: 00…6B
(16)
–> 107
(10)
+30000
(10)
= 30107
(10)
(Meaning that actual measurement is U1. For further informations see REGISTER TABLE FOR THE ACTUAL MEASUREMENTS.)
Register count HI…LO: 00…02
(16)
–> 2
(10)
(Two registers: 30107 and 30108)
Data type: T5 (Unsigned Measurement (32 bit) – see table of DATA types decoding)
Register data: FE 00 59 74
(16)
–> 22934
∗
10
–2
V = 229,34 V
REGISTER TABLE FOR THE ACTUAL MEASUREMENTS
The tables below represent the complete set of MODBUS register map. Register refresh frequency for actual measurement
from register 30105 to register 30190 is one second. Register refresh frequency for energy counters (from 30406 to 30441)
is 40 ms.
The registers from 30426 to 30441 (1000 x Energy Counter from 30406 to 30413 and from 30418 to 30425) represent the
same energy counters at 1000-times higher resolution.
This registers cam be read to calculate the energy difference in the time interval more accurate.
Starting Register
Register Count
CRC
Slave Address
Function Code
HI LO
HI LO
LO HI
21
04
00 6B
00 02
Register Data
CRC
Slave Address
Function Code
Byte Count
HI LO HI LO LO HI
21
04
04
FE 00 59 96