DF-1 Protocol
DF-1 / DF1 protocol is an asynchronous byte-oriented protocol that is used to communicate with most Allen Bradley RS232 interface modules. DF1 protocol consists of link layer and application layer formats. Link layer serial frame is a composition of conventional RS-232 serial frame with the parameters specified as 8 data bits, no parity, and a maximum baud rate of 19200. DF1 is ASCII character oriented protocol and works over half duplex and full duplex modes of communication.
Application Layer Messages
Application layer message format consists of Command Initiator messages (request messages) and Command Executor (reply messages). Important command initiator messages are as follows.
External Links
Retrieved from : http://en.wikipedia.org/wiki/DF-1_Protocol
