Omron CJ - REFERENCE MANUAL 02-2010 Reference Manual page 922

3. Instructions
Serial Gateway Communications with 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) or CMND2(493) instruction is executed to a
serial port that supports the serial gateway function, the serial
gateway function converts the command to a CompoWay/F,
Modbus-RTU, or Modbus-ASCII command.
• Sending to a PLC Operating as a Host Link Slave
When a CMND(490), CMND2(493), SEND(090), SEND2(491),
RECV(098), or RECV2(492) instruction is executed to a serial
port that supports the serial gateway function, the serial gateway
function can send any FINS command or send/receive data.
Communications from a Host Computer Connected through Host Link
It is possible to send FINS commands from a host computer to the PLC to which it is connected as well
as other devices in the network (CPU Units, Special I/O Units, computers, etc.). In this case, the
necessary Host Link header and terminator must be attached to the FINS command when it is sent.
Host computer
Host Link
Host Link FCS
and terminator
886
Host Link header
Modbus RTU
Serial cable
Modbus-RTU Slave device
Host link FINS
Serial cable
CS/CJ/NSJ Series Instructions Reference Manual (W474)
CMND
PLC
CMND
PLC
PLC
Host Link Slave