Rockwell Automation Publication 1756-UM001M-EN-P - February 2012 119
Serial Communication (1756-L6x controllers only) Chapter 6
5. If you are using the User mode protocol (ASCII), click the User Protocol
tab and specify the ASCII paramaters.
After you have configured the controller for ASCII protocol
communication, reference the Logix5000 Controllers General Instruction
Reference Manual, publication 1756-RM003,
for the available ASCII
instructions.
Broadcast Messages Over a
Serial Port
You can broadcast messages over a serial port connection from a master controller
to all of its slave controllers by using several communication protocols. These
protocols include the following:
• DF1 Master
• DF1 Radio Modem
• DF1 Slave
Broadcasting over a serial port is achieved by using the ‘message’ tag. Because
messages are sent to receiving controllers, only the ‘write’ type messages can be
used for broadcasting.
The broadcast feature can be set up by using ladder logic or structured text. The
broadcast feature can also be set by modifying the path value of a message tag in
the tag editor.
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