Omron CJ - PROGRAMMING MANUAL 12-2009 Programming Manual page 345

Serial Communications
Sending FINS Messages
Using CMND(490) in CPU
Unit's Ladder Program
CPU Unit with unit version 3.0 or later
RS-232C port
Protocol
conversion
FINS message-to-serial
CPU Unit with unit
version 3.0 or later
Protocol
conversion
CPU Unit's serial port
Peripheral port
RS-232C port
2. The contents of the CompoWay/F command enclosed in the FINS mes-
sage that is sent is as follows:
Node number + subaddress + SID + command text (ASCII must be used.)
STX, ETX+BCC are not required when sending FINS. They are added au-
tomatically for serial communications.
The CPU Unit converts the FINS messages to CompoWay/F protocol for
sending in this operation.
Access from CPU Unit (on the Same PLC)
Serial conversion
CMND(490)
FINS message
CompoWay/F
2803
FINS header
command
CompoWay/F
command
RS-485 (CompoWay/F)
CompoWay/F-compatible
OMRON component
Access from CPU Unit (PLC on the Network)
CMND(490)
FINS message
CompoWay/F
FINS header 2803
command
Network (Ethernet, Controller
Link, DeviceNet)
CompoWay/F
command
RS-485 (CompoWay/F)
CompoWay/F-compatible
OMRON component
Serial port's unit address
FD hex (253 decimal)
FC hex (252 decimal)
Details
OMRON components
connected serially to
the CPU Unit's RS-
232C port using Com-
poWay/F can be
accessed from a CPU
Unit in the same PLC.
Details
OMRON components
connected serially to
the CPU Unit's RS-
232C port using Com-
poWay/F can be
accessed from a CPU
Unit in a PLC con-
nected to the network.
Section 6-3
Routing tables to
treat serial
communications path
as network
Optional
Routing tables to
treat serial
communications path
as network
Optional
305