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Network Instructions Section 3-24
Communications to a Host Computer (Host Link)
By sending a SEND(090), RECV(098), or CMND(490) instruction to a serial
port set to Host Link mode, the necessary Host Link header and terminator
will be attached to the FINS command and the command will be sent to the
host computer.
Note Host Link communications can be sent through the network. In this case, the
FINS command travels through the network normally. When the command
reaches the Host Link system, the necessary Host Link header and terminator
are attached to the FINS command and the command is sent to the host com-
puter.
Serial Gateway Communications to a Component or Host Link Slave
It is possible to send FINS commands (or send/receive data) to a component
or Host Link Slave connected to the PLC through its serial port with the serial
gateway function.
• Sending to a Component
When a CMND(490) instruction is executed to a serial port that supports
the serial gateway function, the serial gateway function converts the com-
mand to a CompoWay/F, Modbus-RTU, or Modbus-ASCII command.
FINS
FINS
Host computer
Host Link
Host Link header and address
Host computer
Host Link
Serial Communications Option Board port
CJ-series Serial
Communications Unit
Host Link FCS
and terminator
CJ-series Serial Communications Unit port
Serial Communications
Option Board
FINS command
Host Link
Host computer
Host Link header
FINS
command
Host Link FCS
and terminator
Serial cable
Modbus-RTU Slave device
Modbus RTU
CMND
CP1H
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