Omron CJ - 09-2009 Operation Manual page 164

Expanded System Configuration
Note
No-protocol (Custom)
Communications System
116
Host computer
FINS commands sent via
SEND/RECV/CMND
instructions from the PLC
RS-232C
Host Link commands
or FINS commands
1. Set pin 4 of the DIP switch on the front panel of the CPU Unit to ON, and
set the serial communications mode in the PLC Setup to Host Link.
2. Set pin 5 of the DIP switch on the front panel of the CPU Unit to OFF, and
set the serial communications mode in the PLC Setup to Host Link.
3. Host Link master functions can be performed by sending the CMND(490)
instruction via the Serial Gateway when using Serial Communications
Boards/Units with unit version 1.2 or later.
PLC (Host Link Master)
Serial Communications
Board/Unit
Serial
Gateway
FINS
Host Link
header
No-protocol communications allow simple data transmissions, such as input-
ting bar code data and outputting printer data using communications port I/O
instructions. The start and completion codes can be set, and RS and CS sig-
nal control is also possible with no-protocol communications.
The following table shows the usage of each communications port I/O
instruction, based on the communications port being used and the direction of
the data transfer (sending or receiving).
Communica- CPU Unit's built-in
tions port RS-232C port
Send TXD(236)
Receive RXD(235)
Applicable port
CPU Unit
Peripheral port
Yes
(See note 1.)
FINS command sent
CMND(490)
FINS
Host Link
terminator
PLC Host Link slave)
Serial port on a Serial
Communications Unit
(unit version 1.2 or later)
TXDU(256)
RXDU(255)
Section 2-5
Serial
Communi-
cations
Unit
RS-232C port
Yes Yes
(See note 2.)