Rockwell Automation Publication 1756-UM001M-EN-P - February 2012 109
Chapter 6
Serial Communication (1756-L6x controllers
only)
1756-L6x Controller Serial
Port
The 1756-L6x ControlLogix controllers have a built-in RS-232 port that can be
used in a variety of serial-based applications. The potential serial communication
applications include the following:
• DF1 modes (including broadcast message support)
• DF1 radio modem
• ASCII device communication
Figure 13 - ControlLogix DF1 Device Communication Example
Topic Page
1756-L6x Controller Serial Port 109
Communication with Serial Devices 110
DF1 Master Protocol 110
DF1 Point to Point Protocol 111
DF1 Radio Modem Protocol 111
DF1 Slave Protocol 114
DH-485 Protocol 115
ASCII Protocol 117
Configure the 1756-L6x Controller for Serial Communication 117
Broadcast Messages Over a Serial Port 119
Modbus Support 122
Additional Resources 122
Modem
Modem
Modem
RS-232 Connection
DH+ Connection
EtherNet/IP
Network
RS-232 Connection
RS-232 Connection
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