Omron CS1G/H-CPUxxH Instructions Manual page 904

Network Instructions
Transmission through
Host Link
Flags
When the CPU Unit's built-in serial port, a Serial Communications Board (CS-
series only), or Serial Communications Unit is in host link mode and con-
nected one-to-one with a host computer, SEND(090) can be executed to
transmit data from the PLC to the host computer the next time that the PLC
has the right to transmit. It is also possible to transmit to other host computers
connected to other PLCs elsewhere in the network.
Host computer
Host Link
If SEND(090) is sent to the serial port of the CPU Unit, a Serial Communica-
tions Board (CS Series only), or Serial Communications Unit, a command is
sent from the serial port to the host computer. The command is a FINS mes-
sage enclosed between a host link header and terminator. The FINS com-
mand is a MEMORY AREA WRITE command (command code 0102) and the
host link header code is 0F hexadecimal.
A program must be created in the host computer to process the received com-
mand (the FINS command enclosed in the host link header and terminator).
If the destination serial port is in the local PLC, set the network address to 00
(local network) in C+1, set the node address to 00 (local PLC) in C+2, and set
the unit address to 00 (CPU Unit), E1 (Inner Board (CS Series only), or unit
number + 10 hexadecimal (Serial Port Unit).
Name Label
Error Flag ER
Data
Serial port
Operation
ON if the serial port number specified in C+1 is not within
the range of 00 to 04.
ON if the Communications Port Enabled Flag is OFF for
the communications port number specified in C+3.
OFF in all other cases.
Section 3-25
883