DF1 protocol is an Allen-Bradley data-link layer protocol

that combines .... Softlogix 5800 provides virtual PLC

control using a PC and RSLogix 5000. ...

The DF-1 protocol is an asynchronous byte-oriented protocol

that is used to communicate with most Allen-Bradley RS-232

interface modules. More specifically, the DF-1 serial frame

composition is that of a conventional RS-232 serial frame,

where DF-1 forces some of the serial parameters such as 8

data bits, no parity, and a maximum baud rate of 19200.

Further, the DF-1 protocol specifies how to send data

through a conventional RS-232 serial port, in order to

communicate with the corresponding Allen-Bradley products.