CARLO GAVAZZI EM21 - COMMUNICATION PROTOCOL V1 REV0 Manual do Utilizador descarregar pdf (Página 4)

CARLO GAVAZZI

CONTROLS

SERIAL COMMUNICATION PROTOCOL

WM24-96

V1 R0

Page

1.2.1 Function 04 (read words)

Request frame

Address Function Data address n° of words CRC

1 byte 1 byte 2 byte 2 byte 2 byte

From 1 to 255 04h MSB LSB MSB LSB MSB LSB

NOTE: - The maximum number of word is 12 (24 byte).

- The address 00 is not allowed (it generates no answer)

Answer frame

Address Function n° byte (=2 x n° word) Values CRC

1 byte 1 byte 1 byte n° byte (=2 x n° word) 2 byte

From 1 to 255 04h MSB LSB … MSB LSB

1.2.2 Function 06 (write one word)

Request frame

Address Function Data address Value CRC

1 byte 1 byte 2 byte 2 byte 2 byte

From 1 to 255 06h MSB LSB MSB LSB MSB LSB

Answer frame

Address Function Data address Value CRC

1 byte 1 byte 2 byte 2 byte 2 byte

From 1 to 255 06h MSB LSB MSB LSB MSB LSB

NOTE: the answer frame is an echo of the request frame, which confirm the execution of the

command.

The MSB value of the request frame will be written in the specified address, the LSB one in the

specified address+1.

IMPORTANT: if the address is 00 (zero) all the instruments connected to the network will execute

the command but will not send an answer frame.

Gross Automation (877) 268-3700 · www.carlogavazzisales.com · [email protected]

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CARLO GAVAZZI EM21 - COMMUNICATION PROTOCOL V1 REV0 Manual do Utilizador Página 4