Initial Register: 0000, register from which to start reading.
No� of registers: 0002, number of registers to be read.
CRC: 70B0, CRC character.
Response:
Address Function
No� of
Bytes
Register
no� 1
Register
no� 2
CRC
0A 04 04 0000 084D 8621
Address: 0A, Responding peripheral number: 10 in decimal.
Function: 04, Read function.
No� of bytes: 04, No. of bytes received.
Register: 0000084D, value of the L1 phase voltage: VL1 x 10: 212.5 V
CRC: 8621, CRC character.
6.3.- MODBUS MEMORY MAP
All MODBUS map addresses are hexadecimal.
6�3�1�- MEASUREMENT VARIABLES
For these variables Function 0x04 is implemented: reading registers.
Each instantaneous value occupies 2 registers.
The maximum and minimum values occupy 4 registers, 2 for the variable value while the next
two indicate the date and time when the maximum or minimum value was read, in compact
format (U32).
The short format of the register date and time is:
Bit
32
Bits
31 ��� 27
Bits
26���23
Bits
22���18
Bits
17���13
Bits
12���7
Bits
6���1
x Year Month Day Hour Minutes seconds
The year is calculated with the offset = 2013, that is the
Real Year : 2013 + Year ( bits 31 ...27) .
Each units occupies a separate register.
Table 36: Modbus memory map: measurement variables
Parameter Symbol Instantaneous Maximum Minimum
Units
(32)
Phase voltage L1 V1 00-01 100-103 300-303 157C
Current L1 A1 02-03 104-107 304-307 157D
Active Power L1 kW1 04-05 108-10B 308-30B 1580
Inductive Reactive Power L1 kvarL1 06-07 10C-10F 30C-30F 1580
Capacitive Reactive Power L1 kvarC1 08-09 110-113 310-313 1580
Apparent Power L1 kVA1 0A-0B 114-117 314-317 1580
Power Factor L1 PF1 0C-0D 118-11B 318-31B 1583
Cos φ L1 Cos φ1 0E-0F 11C-11F 31C-31F x 100
229
Instruction Manual
CVM-A1000 - CVM-A1500
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