Omron CJ1W-SCU32 Operation Manual page 216

5 Serial Gateway
System Configuration
Sending Messages Using SendCmd Instructions in CPU Unit's User Program
(The Unit converts the messages to CompoWay/F protocol)
Serial Communications Unit
Protocol
conversion
Note 1 The header contains the following information.
• Remote destination network address (DNA): Network address to specify actual remote
Pocasset 0 (local network).
• Remote destination node address (DA1): Node address to specify actual remote Pocas-
set 0 (communications within local PLC).
• Remote destination unit address (DA2):
Unit address of serial communications port. An appropriate value is calculated and set
as follows:
When port 1 is used: Unit address = BYTE#16#80 + BYTE#16#04 × Unit number (hexa-
decimal)
When port 2 is used: Unit address = BYTE#16#81 + BYTE#16#04 × Unit number (hexa-
decimal)
2 The contents of the CompoWay/F command enclosed in the message that is sent is as fol-
lows:
Node number + subaddress + SID + command text (ASCII must be used.)
STX, ETX+BCC are not required when sending commands. They are added automatically
for serial communications.
5-24
CPU Bus-to-Serial
SendCmd
CPU Unit
FINS message
CompoWay/F
2803
Header
command
CompoWay/F
command
RS-485 (CompoWay/F)
CompoWay/F-compatible
OMRON component
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Details
From the CPU Unit, it is possible
to access OMRON components
that are connected to the Serial
Communications Unit via a
serial network (CompoWay/F).