Circutor CVM-C11, Инструкция по эксплуатации

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7�2�- MODBUS PROTOCOL
In the Modbus protocol, the
CVM-C11
device uses the RTU (Remote Terminal Unit) mode.
The Modbus functions implemented in the device are as follows:
Function 0x03 and 0x04
: Reading integer logs.
Function 0x05 : Writing a relay.
Function 0x10:
Writing multiple logs.
7�2�1�- READING EXAMPLE: FUNCTION 0x04�
Question: Instantaneous value of the phase voltage of L1
Address Function
Initial
Register
No� of
Registers
CRC
0A 04 0000 0002 70B0
Address: 0A , Peripheral number: 10 in decimals.
Function: 04
, Read function.
Initial Register: 0000 , on which the reading will start.
No� of Registers: 0002
, number of registers 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 decimals.
Function: 04 , Read function.
No� of bytes: 04 , No. of bytes received.
Registers: 0000084D
, value of the phase voltage of L1: VL1 x 10 : 212.5V
CRC: 8621 , CRC Character.
Note: Every Modbus frame has a maximum limit of 20 variables (40 logs).
7�2�2�- WRITING EXAMPLE: FUNCTION 0x05�
Question:
Deleting maximum and minimum values.
Address Function
Initial
Register
Value CRC
0A 05 0834 FF00 CEEF
Address: 0A
, Peripheral number: 10 in decimal.
Function: 05 , Read function.
Initial Register: 0834
, Register of the parameter for deleting maximum and minimum values.
Value: FF00 , we indicate that we want to delete the maximum and minimum values.
CRC: CEEF , CRC character.
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Instruction Manual
CVM-C11