Omron SYSMAC CJ1W-SCU21-V1 User Manual

239
Communications Frames Section 6-8
Response Frame
6-8-3 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
28
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:
2 bytes)
FUNCTION
code
(ASCII code
2 characters:
2 bytes)
Communications data
(ASCII code n characters)
Header
":"
(ASCII code
3A hex)
FUNCTION code
(ASCII code
2 characters:
2 bytes)
CR
(0D hex)
Modbus-ASCII frame
Communications data
(ASCII code n characters)
LF
(0A hex)
Slave address
(ASCII code
2 characters:
2 bytes)
Frame after Conversion
SRCEtc.
LRC
(2 ASCII
characters:
2 bytes)

Omron SYSMAC CJ1W-SCU21-V1 Specifications

General

Brand	Omron
Model	SYSMAC CJ1W-SCU21-V1
Category	Network Hardware
Language	English