CompactLogix System

Catalogs > Automation Systems Catalog > Programmable Controllers > CompactLogix System > Networks

Networks

Serial Network

The 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.

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 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



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.