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Communications Frames Section 3-7

Response Frame

3-7-3 Modbus-ASCII

Command Frame

Frame before Conversion

FINS header

Modbus-RTU frame

Start (silent

interval of

3.5

characters)

(See note.)

End (silent

interval of

3.5

characters)

(See note.)

Slave

address

(1 byte)

FINS command

FUNCTION

code

(1 byte)

Communications data

(n bytes)

Error

check

CRC

(1 byte)

FINS end code

Frame after Conversion

Modbus-RTU

(command section only)

FUNCTION

code (1 byte)

Slave

address

(1 byte)

SRESMRESSRCRemote

network

address

(DNA)

Remote

node

address

(DA1)

Remote

unit

address

(DA2)

MRC

04Serial port

allocated

address

00 hex Serial

port

unit

address

or local

network

address

or local

network

node

address

Etc.

User-

speci-

fied

User-

speci-

fied

Communica-

tions data

(n bytes)

Frame before Conversion

FINS header FINS command

Remote

network

address

(DNA)

Remote

node

address

(DA1)

Remote

unit

address

(DA2)

MRC

Serial port

allocated

address

00 hex Serial

port

unit

address

or local

network

address

28 05

or local

network

node

address

Modbus-ASCII

(command section only)

Slave

address

(ASCII code

2 characters:

4 bytes)

FUNCTION

code

(ASCII code

2 characters:

4 bytes)

Communications data

(ASCII code n characters)

Header

":"

(ASCII code

3A hex)

FUNCTION code

(ASCII code

2 characters:

4 bytes)

(0D hex)

Modbus-ASCII frame

Communications data

(ASCII code n characters)

(0A hex)

Slave address

(ASCII code

2 characters:

4 bytes)

Frame after Conversion

SRCEtc.

Brand	Omron
Model	CJ - REFERENCE MANUAL 07-2009
Category	Computer Hardware
Language	English

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