56 Rockwell Automation Publication 1769-UM011H-EN-P - April 2012
Chapter 4 Communicate over Networks
Table 10 - CompactLogix Serial Port Configurations
Mode Modes
DF1 Point-to-Point Communicate between the controller and one other DF1-protocol-compatible device.
This is the default system mode. Default parameters are:
• Baud Rate: 19,200
• Data Bits: 8
• Parity: None
• Stop Bits: 1
• Control Line: No Handshake
• RTS send Delay: 0
• RTS Off Delay: 0
This mode is typically used to program the controller through its serial port.
DF1 Master Control polling and message transmission between the master and slave nodes.
• The master/slave network includes one controller configured as the master node and as many as 254 slave nodes. Link slave nodes using modems
or line drivers.
• A master/slave network can have node numbers from 0...254. Each node must have a unique node address. Also, at least 2 nodes must exist to
define your link as a network (1 master and 1 slave station are the two nodes).
DF1 Slave Use a controller as a slave station in a master/slave serial communication network.
• When there are multiple slave stations on the network, link slave stations using modems or line drivers to the master. When you have a single
slave station on the network, you do not need a modem to connect the slave station to the master. You can configure the control parameters for no
handshaking. You can connect 2...255 nodes to a single link. In DF1 slave mode, a controller uses DF1 half-duplex protocol.
• One node is designated as the master and it controls who has access to the link. All the other nodes are slave stations and must wait for permission
from the master before transmitting.
DF1 Radio Modem • Compatible with SLC500 and MicroLogix1500 controllers.
• This mode supports master and slave, and store and forward modes.
User (channel 0 only) Communicate with ASCII devices.
This requires your program to use ASCII instructions to transmit data to and from ASCII device.
DH-485 • Communicate with other DH-485 devices.
• This multi-master, token-passing network allows programming and peer-to-peer messaging.
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