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266
RS-232C Units
Section 6-2
6-2-6
Using the RS-232C Unit
The RS-232C Unit is set and controlled using explicit DeviceNet messages or
the DeviceNet Configurator. When the default communications settings for the
RS-232C port are not used, the settings must be changed using explicit mes-
sages or the DeviceNet Configurator.
Making Settings with
Explicit Messages
The general operating procedure for the RS-232C Unit is as follows:
1,2,3...
1.
Turn ON the power to the Master Unit and all Slaves, including the RS-
232C Unit.
2.
When necessary, explicit messages can be sent from the Master to set the
parameters of the RS-232C ports 1 and 2 on the RS-232C Unit.
Note a) Communications setting do not become effective even after the
explicit message has been completed normally. For the settings to
be effective, the RS-232C port must be reset using the PORT RE-
SET command, or by restarting the RS-232C Unit. The previous
settings will be in effect until the new settings are enabled.
b) The communications settings are held internally by the RS-232C
Unit, so once they have been set, they will not change when the
Unit is turned OFF or reset, and once set, it is not necessary to set
the parameters again, unless there are changes to be made.
3.
Register the RS-232C Unit in the Master’s scan list. There are two meth-
ods of registering on the scan list.
• Turn ON the Enable Scan List software switch on the Master Unit.
• Create a scan list and registering the Unit using a DeviceNet Configu-
rator.
For further details on Master Unit operations, refer to the
DeviceNet Master
Unit Operation Manual
or the
DeviceNet Configurator Operation Manual
.
4.
When necessary, explicit messages can be sent from the Master to control
the flow of data through the RS-232C ports 1 and 2 on the RS-232C Unit.
Note a) When sending or receiving data through ports 1 and 2, it is neces-
sary to check the status word allocated to the RS-232C Unit for
communications status in the Master’s IN Area.
b) Ports 1 and 2 can send and receive data independently but be-
cause the RS-232C Unit itself can only process one explicit mes-
sage at a time, even if the SEND/RECV commands to be sent are
for another port, always make sure that the previous explicit mes-
sage has been processed before sending the next message.
Making Settings with the
DeviceNet Configurator
The communications settings can be made using the OMRON DeviceNet
Configurator (version 2.
@
or later). When using a version earlier than 2.
@
,
contact your local sales office before use. (Version information can be con-
firmed from the Help Menu.)
1,2,3...
1.
Connect a DeviceNet Configurator to the DeviceNet Network and go on-
line.
2.
Turn ON the power to the RS-232C Unit.
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