Circutor CVM-NRG96 Series (Available until stocks) Instrukcja Użytkownika Pobierz pdf (Strona 31)

CVM-NRG96

M9817250120-03-05A

MODBUS

Protocol

The CVM-NRG96 power analyzers communicate by using MODBUS© protocol,

described below:

In the MODBUS protocol the RTU (Remote terminal Unit) mode is used; each 8-bit

byte in a message contains two 4-bits hexadecimal characters.

The format for each byte in RTU mode

Code 8 bit binary, hexadecimal 0-9, A-F

2 hexadecimal characters contained in each 8-bit

field in the message.

Bits per byte 8 data bits

Field Check-Error CRC Type (Cyclical Redundancy Check)

Modbus functions used

Function 01 Reading the status of the relays

Function 03 and 04 Reading n Words (16 bits-2 bytes). Function used for

reading the electrical parameters that the CVM-NRG96 is

measuring. All electrical parameters are long with 32 bits,

because of this two Words are required to request each

parameter.

(4 bytes - XX XX XX XX)

Function 05 Writing a relay.

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 37 38

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Circutor CVM-NRG96 Series (Available until stocks) Instrukcja Użytkownika Strona 31