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Communications Frames Section 3-7

Note CompoWay/F commands use ASCII as the transmission code. Therefore, be

sure to use ASCII for the CompoWay/F command after the FINS command

code 2803 hex (from node number to text) using CMND(490) or other instruc-

tion.

Example: If the CompoWay/F command MRC SRC is “01” “02” (where the

quotation marks (“ ”) indicate ASCII characters), 0, 1, 0, 2 must be treated as

ASCII characters. Therefore, set “01” as 3031 hex (not 01 hex), and “02” as

3032 hex (not 02 hex).

Further, to write the CompoWay/F command to the command storage area

using CMND(490) in frame order (without creating empty bytes), the SID com-

ponent of the CompoWay/F command requires 1 byte of ASCII as 30 hex, so

the subsequent components (s+3 and afterwards) must be set in one byte

each.

Response Frame

3-7-2 Modbus-RTU

Command Frame

Note The silent interval in the Modbus-RTU frame is automatically generated by the

Serial Communications Board/Unit.

Frame before Conversion

CompoWay/F

(See note.)

FINS end codeFINS commandFINS header

Frame after Conversion

CompoWay/F

STX

(02 hex)

Node No.

(× 10

)

(× 10

)

(ASCII

code

4 bytes)

Remote

network

address

(DNA)

Remote

node

address

(DA1)

SRCMRC MRES SRES

Serial

port

allocated

address

00 hex Serial

port unit

address

Node No.

(× 10

)

(× 10

)

(ASCII code

2 bytes)

Sub-

address

"00"

(ASCII code

3030 hex)

etc.

Command

(MRC,

SRC)

(ASCII

code

4 bytes)

End code

(ASCII

code

2 bytes)

Response

(MRES,

SRES)

(ASCII

code

4 bytes)

Text

(ASCII

code)

Sub-

address

"00"

(ASCII

code

3030

hex) etc.

Command

(MRC,

SRC)

(ASCII

code

8 bytes)

Text

(ASCII

code)

Response

(MRES,

SRES)

(ASCII

code

8 bytes)

ETX

(03 hex)

BCCEnd code

(ASCII

code

8 bytes)

Remote

unit ad-

dress

(DA2)

etc.

User-

speci-

fied

User-

speci-

fied

Frame before Conversion

FINS header

Frame after Conversion

FINS command

Remote

network

address

(DNA)

Remote

node

address

(DA1)

Remote

unit

address

(DA2)

Etc. MRC SRC

Serial port

allocated

address

00 hex Serial

port

unit

address

28 04

or local

network

address

or local

network

node

address

Modbus-RTU frame

Start (silent

interval of

3.5

characters)

(See note.)

Slave

address

(1 byte)

FUNCTION

code

(1 byte)

Communications data

(n bytes)

Error

check

CRC

(1 byte)

End (silent

interval of

3.5

characters)

(See note.)

Modbus-RTU

(command section only)

Slave

address

(1 byte)

FUNCTION

code(1 byte)

Communications data

(n bytes)

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

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