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FINS Commands with Host Link Protocol Section 3-5
Unit Number
The unit number of the Host Link port connected to the host computer is set.
Header Code
The header code in FINS commands sent to the host computer is always set
to “OF” (ASCII: 4F, 46).
Response Wait Time
The response wait time in FINS commands sent to the host computer is fixed
at to “0” (ASCII: 4F, 46).
ICF (Information Control Field)
Specifies whether or not a response is required.
Response required: “80” (ASCII: 38,30)
Response not required: “81” (ASCII: 38,31)
RSV (Reserved)
Always set to “00” (ASCII: 30,30) in commands sent to the host computer.
GCT (Gateway Count)
The number of networks through which the command is relayed subtracted
from 2 is set. (See note.)
Number of networks = 0: “02” (ASCII: 30, 32)
Number of networks = 1: “01” (ASCII: 30, 31)
Number of networks = 2: “00” (ASCII: 30, 30)
Number of networks = 7: “07” (ASCII: 30, 37)
Note The number of networks is subtracted from 7 for a CS/CJ-series CPU Unit
with unit version 2.0 or later, CP-series CPU Unit, or NSJ Controller.
DNA, DA1, DA2
The addresses for the Host LInk Unit connected to the host computer are set.
DNA (Destination Network Address)
The network address (00 to 7F Hex) of the CPU Unit is set in hexadecimal.
DA1 (Destination Node Address)
The node address (01 to 7E Hex) of the CPU Unit is set in hexadecimal.
DA2 (Destination Unit Address)
The unit address of the Host Link port is set.
SNA, SA1, SA2
The addresses for the source node (e.g., PLC, FA computer) are set.
SNA (Source Network Address)
The network address (00 to 7F Hex) of the source is set in hexadecimal.
Unit No. Header
code
Response
wait time
ICF RSV GCT DNA DA1
DA2 SNA SA1 SA2 SID Command code Text (1,080
characters
max.)
FCS Terminator
xx xxxxx
xxxxxxxxxxxxxx
xx
*
xx
xx
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