CARLO GAVAZZI UDM 40 - PROGRAMMING Manual de usuario descargar pdf (Pagina 4)

CARLO GAVAZZI

CONTROLS

SERIAL COMMUNICATION PROTOCOL

UDM - USC

V1 R1

Page

1.2.1 Function 03 or 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 03h or 04h MSB LSB MSB LSB MSB LSB

NOTE:

- The maximum number of word is 13 (26 byte).

- The address 00 (zero) 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 03h or 04h XX … 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.

1.2.3 Function 08 (diagnostic function)

Request frame

1.2.4 Address

Function Diagnostic code Value CRC

1 byte 1 byte 2 byte 2 byte 2 byte

From 1 to 255 08h 00h 00h AAh 55h MSB LSB

Answer frame

1.2.5 Address

Function Diagnostic code Value CRC

1 byte 1 byte 2 byte 2 byte 2 byte

From 1 to 255 08h 00h 00h AAh 55h MSB LSB

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

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CARLO GAVAZZI UDM 40 - PROGRAMMING Manual de usuario Pagina 4

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