Catalogs > Automation Systems Catalog > Programmable Controllers > CompactLogix System > Communication Modules
Communication Modules
| Introduction |  |
Environmentals and Certifications | |
EtherNet/IP Network | |
ControlNet Network | |
DeviceNet Network | |
Serial Network | |
DH-485 Network | |
The controller serial port is compatible with RS-232 serial communication. The serial port supports the DF1 protocol to communicate with other devices on the serial link.
| Use this DF1 mode | For |
| Point-to-point | Communication between a controller and other DF1-compatible devices using DF1 full-duplex protocol. |
| DF1 radio modem | SCADA applications where controllers exchange data via radio transmission. |
| DF1 master | Control of polling and message transmission between the master and each slave using DF1 half-duplex polled protocol. |
| DF1 slave | Using the controller as a slave station in a master/slave serial network using DF1 half-duplex protocol. |
| User mode (ASCII) | Communication between a controller and an ASCII device, such as a bar code reader. |
Select a Serial Port Interface
The controller you choose determines the number of serial ports that are available.
| If you need | Identified as | With this protocol | Select this controller |
| One serial port | Channel 0 (fully isolated) | DF1, DH-485, ASCII | 1768-L43, 1768-L45 1768-L43S, 1768-L45S 1769-L35CR, 1769-L32C 1769-L35E, 1769-L32E 1769-L23E-QB1B, 1769-L23E-QBFC1B |
| Two serial ports | Channel 0 (fully isolated) Channel 1 (non-isolated) |
Channel 0: DF1, DH-485, ASCII Channel 1: DF1, DH-485 |
1769-L31 1769-L23-QBFC1B |
If you connect the controller to a non-isolated port (channel 1) on the controller to a computer, modem, or ASCII device, install an isolator (such as the 1761-NET-AIC interface converter) between the controller and the end device.
Example Serial Configuration
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Modbus Support
To use Logix5000 controllers on Modbus, you connect through the serial port and execute a specific ladder logic routine. The controller project is available with RSLogix 5000 Enterprise programming software. For more information, see Using Logix5000 Controllers as Masters or Slaves on Modbus Application Solution, publication CIG-AP129.