Serial Communications; Overview Of Serial Communications - Omron CJ2 CPU UNIT SOFTWARE User Manual

11-2 Serial Communications

11-2-1 Overview of Serial Communications

The serial communications port mode (protocol) can be switched in the CPU Unit's PLC Setup.
Depending on the protocol selected, the following systems can be configured.
Protocols
The following protocols support serial communications.
Protocol
(Serial Communications Mode)
Peripheral bus (toolbus)
(RS-232C port on CPU Unit only.
Not supported for Serial Communi-
cations Unit.)
Host Link (SYSMAC WAY) slave
*1
No-protocol
NT Links (1: N)
Serial Gateway
CompoWay/F Master
*1
Modbus Master
(Serial Communications Unit
only. Not supported for RS-
232C port on CPU Unit.)
Host Link FINS (SYSWAY) Mas-
*1
ter
(Serial Communications Unit
only. Not supported for RS-
232C port on CPU Unit.)
Protocol macro
(Serial Communications Unit only.
Not supported for RS-232C port on
CPU Unit.)
Serial PLC Links (CJ2M CPU Units
only)
*1 Serial Communications Unit with unit version 1.2 or later only.
CJ2 CPU Unit Software User's Manual
11 Programming Devices and Communications
Main connection
CX-Programmer
Personal computer
OMRON Programmable
Terminals
General-purpose external
devices
OMRON Programmable
Terminals
OMRON Component
PLC
*1 CompoWay/F slave
Modbus slave
Host Link FINS (SYSWAY)
slave (PLC)
General-purpose external
devices
OMRON PLCs (CJ2M,
CJ1M, CP1H, CP1L, and
CP1E CPU Units)
Use
Communications between Program-
ming Devices and the PLC from the
computer.
Communications between the Host
computer and the PLC. Commands
can be sent to a computer from the
PLC.
No-protocol communications with
general-purpose devices.
High-speed communications with
Programmable Terminals via direct
access.
Converts FINS commands that are
received into CompoWay/F, Modbus,
or Host Link protocols, and then
transmits the converted command to
the serial line.
Converts FINS commands (encapsu-
lated CompoWay/F commands)
received at the serial port into Com-
poWay/F commands.
Converts FINS commands (encapsu-
lated Modbus commands) received at
the serial port into Modbus com-
mands.
Converts FINS commands into FINS
commands encapsulated in Host Link
Sending and receiving messages
(communications frames) according
to the communications specifications
of external devices. (SYSMAC-PST is
used to create protocols by setting
various parameters.)
Up to 10 words of data per Unit can
be shared between up to nine CPU
Units (one Polling Unit and up to eight
Polled Units).
Applicable commands, commu-
nications instructions
None
Host Link commands/ FINS com-
mands. Commands can be sent
to a computer from the PLC.
TXD(236) instruction, RXD(235)
instruction, TXDU(256) instruc-
tion, RXDU(255) instruction
DTXDU (262) instruction
DRXDU (261) instruction
None
---
FINS command
2803 hex received
(including sending FINS com-
mand using CMND(490))
FINS command
2804 hex or 2805 hex received
(including sending FINS com-
mand using CMND(490))
Any FINS command received
except those sent to serial port
(including sending FINS com-
mand using CMND(490))
PMCR(260) instruction
None
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