Publication 1763-UM001E-EN-P - June 2015
78 Communication Connections
Using a Modem
You can use modems to connect a personal computer to one MicroLogix™
1100 controller (using DF1 Full-Duplex protocol), to multiple controllers
(using DF1 Half-Duplex protocol), or Modbus RTU Slave protocol via
Channel 0, as shown in the following illustration. (See Appendix E for
information on types of modems you can use with the micro controllers.)
(1) Series C or later cables are required for Class I Div 2 applications.
You can connect a MicroLogix 1100 controller to your modem directly
without using an external optical isolator, such as AIC+, catalog number
1761-NET-AIC, as shown in the illustration below, because Channel 0 is
isolated within the controller.
Do not attempt to use DH-485 protocol through
modems under any circumstance. The
communication timing using DH-485 protocol is not
supported by modem communications.
Modem Cable
(straight-through)
Personal Computer
Modem
Modem
MicroLogix 1100
Channel 0
Protocol Options
• DF1 Full-Duplex protocol (to 1 controller)
• DF1 Half-Duplex protocol (to multiple controllers)
• Modbus RTU Slave protocol
1761-CBL-AP00 or
1761-CBL-PM02
(1)
(straight-through)
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