Automation Direct DL405 Manuel - Page 6
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Introduction
As an Extra
Communication
Port
As a Modbus
Network Interface
As an extra communication port, the DCM has specifications similar to the bottom
port on the DL405 PLCs. Plus, the DCM can communicate at higher baud rates. If
you can connect a device to the bottom port on the DL405 PLC, then you can also
connect the same device to the DCM. These devices can be a variety of things, such
as operator interfaces or personal computers.
Since the DCM does not require any programming, you can simply set the DCM
communication parameters, connect the appropriate RS232C or RS422 cables,
and start transferring data.
Quickly add extra Communication ports*
* Number of DCMs is limited by the available power budget
The DCM can be used as a slave station interface to connect your DL405 system to
the Modbus network using the Modbus RTU protocol. The host system must be
capable of issuing the Modbus
This manual does not describe the Modbus
Gould Modbus
Protocol Reference Guide for details (P1-MBUS-300 Rev. B).
There may be more recent editions of this manual, so check with your Modbus
supplier before ordering the documentation. (A cross reference for the Data Types is
supplied later in this manual).
Modbus Master
Network
Slave
commands to read or write the appropriate data.
protocol. You must reference the
Modbus
Network using RTU Protocol
As a slave station....
responding to network requests
DL405 Slave
with DCM
Network
Slave