Rockwell Automation Publication 1756-UM001M-EN-P - February 2012 111
Serial Communication (1756-L6x controllers only) Chapter 6
DF1 Point to Point Protocol
The DF1 Point to Point protocol is used when connecting from the controller to
one DF1 device. This is the default System mode protocol. Default parameters
are listed in this table.
DF1 Radio Modem Protocol
Your ControlLogix controller includes a driver that allows it to communicate
over the DF1 Radio Modem protocol. This driver implements a protocol,
optimized for use with radio modem networks, that is a hybrid between DF1 full-
duplex protocol and DF1 half-duplex protocol, and therefore is not compatible
with either of these protocols.
Figure 15 - DF1 Radio Modem Network Example
Table 29 - Default DF1 Point to Point Parameters
Parameter Value
Baud Rate 19,200
Data Bits 8
Parity None
Stop Bits 1
Control Line No Handshake
RTS send Delay 0
RTS Off Delay 0
The DF1 radio modem driver should be used only among devices that
support and are configured for the DF1 Radio Modem protocol.
Additionally, there are some radio modem network configurations that will
not work with the DF1 radio modem driver. In these configurations,
continue to use DF1 half-duplex protocol.
Power
OUT
L1
L2/N
Modem
Modem
Modem
Modem
RS-232
EtherNet/IP Network
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