Circutor CVM-C10 Series Bedienungsanleitung PDF herunterladen (Seite 62)

4�10�2� PROTOCOL

In the Modbus protocol, the CVM-C10 unit uses the RTU (Remote Terminal Unit) mode.

The Modbus functions implemented in the unit are as follows:

0x03 and 0x04 function. Reading integer logs.

0x05 function. Writing a relay.

0x10 function. Writing multiple logs.

4�10�2�1 Ejemplo de lectura : Función 0x04�

Question: Instantaneous value of the phase voltage of L1

Address Function Initial log No� of logs CRC

0A 04 0000 0002 70B0

Address: 0A, Peripheral number: 10 in decimals.

Function: 04, Read function.

Initial Log: 0000, log on which the reading will start.

No� of logs: 0002, number of logs read.

CRC: 70B0, CRC Character.

Response:

Address

Func-

tion

No� of

Bytes

Log No� 1 Log 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.

Log: 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).

4�10�2�2� Writing example: 0x05 function.

Question: Deleting maximum and minimum values.

Address Function Initial log Value CRC

0A 05 0834 FF00 CEEF

Address: 0A, Peripheral number: 10 in decimal.

Function: 05, Read function.

Initial Log: 0834, log 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.

CVM-C10

Instruction Manual

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Circutor CVM-C10 Series Bedienungsanleitung Seite 62