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Communications Frames Section 6-8
Host Link FINS Protocol Conversion and Use of Network
Routing tables are required to enable the serial communications path to be
treated as a network. This is because with Host Link FINS, the FINS remote
node address is used to specify the target (communications partner PLC that
is the Host Link slave). Therefore, the node to which the Board/Unit is
mounted cannot always be specified, depending on the FINS remote node
address. To specify the Unit at the target requires the FINS remote unit
address. Therefore, the serial port cannot always be specified depending on
the FINS unit address.
The network address for the serial communications path is used to specify
from the network the node to which the Board/Unit is mounted and the serial
port. Therefore, routing tables must be used to enable the serial communica-
tions path to be treated as a network.
Host Link FINS Protocol Conversion and Use of Serial Connection
Routing tables are not required to enable serial communications paths to be
treated as networks. The serial port in the node can be specified without rout-
ing tables by specifying the network address as the unit address of the serial
port.
6-8 Communications Frames
6-8-1 CompoWay/F
Command Frame
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).
Frame before Conversion
FINS header FINS command
CompoWay/F
(See note.)
MRC SRC
00 hex 28 03
Node No.
(× 10
1
)
(× 10
2
)
(ASCII code
2 bytes)
Sub-
address
"00"
(ASCII code
3030 hex)
etc.
SID
"0"
(ASCII
code
30 hex)
Command
(MRC, SRC)
(ASCII code
4 bytes)
Text
(ASCII code)
CompoWay/F
STX
(02 hex)
Node No.
(× 10
1
)
(× 10
2
)
(ASCII code
2 bytes)
Sub-
address
"00"
(ASCII code
3030 hex)
etc.
BCCETX
(03 hex)
Text
(ASCII code)
Command
(MRC, SRC)
(ASCII code
4 bytes)
SID
"0"
(ASCII
code
30 hex)
Frame after Conversion
Etc.Remote
network
address
(DNA)
Remote
node
address
(DA1)
Remote
unit
address
(DA2)
Serial port
allocated
address
or local
network
address
or local
network
node
address
Serial
port unit
address
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