Omron SYSMAC CJ1W-SCU21-V1, Operation Manual

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Communications Frames Section 6-8
Response Frame
6-8-4 Host Link FINS
Command Frame
Frame before Conversion
Modbus-ASCII frame
Header
":"
(ASCII code
3A hex) Slave address
(ASCII code
2 characters:
2 bytes)
Remote
network
address
(DNA)
FUNCTION code
(ASCII code
2 characters:
2 bytes) Communications data
(ASCII code n characters)
or error code CR
(0D hex)
FINS command FINS header
Remote
node
address
(DA1)
28 05
Remote
unit
address
(DA2)
LF
(0A hex)
FINS end code
or local
network
address or local
network
node
address
Serial port
allocated
address
SRC Modbus-ASCII
(command section only) MRES SRES
Slave
address
(ASCII code
2 characters:
2 bytes)
MRC
Frame after Conversion
00 hex Serial
port
unit
address FUNCTION
code
(ASCII code
2 characters:
2 bytes) Communications data
(ASCII code n characters)
or error code
Etc.
User-
speci-
fied User-
speci-
fied
LRC
(2 ASCII
characters:
2 bytes)
Frame before Conversion
Remote
network
address
(DNA) Remote
node
address
(DA1) Etc. MRC SRC
FINS header
Remote
unit
address
(DA2)
FINS text
User-specified Any
except
serial
port
unit
address Unit No.
for Host
Link
+ 1
(1 to 32) Serial port
allocated
address
or serial
port unit
address
Frame after Conversion
Host
Link
header
code
Host Link
header
Etc.
@ Unit No. for
Host Link
(0 to 31) FA
FINS header
Text
FINS text
Error
check
code
Terminator
FCS
*+CR
FINS
command
User-
speci-
fied User-
speci-
fied
FINS
command