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Reference.org
DF-1 Protocol
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<p>DF-1 / DF1 protocol is an <a href="/facts/Asynchronous_serial_communication/amrIkBQR">asynchronous</a> byte-oriented protocol that is used to communicate with most <a href="/facts/Allen_Bradley/CjmJlac5">Allen Bradley</a> <a href="/facts/RS-232/NCpvGuyq">RS-232</a> interface modules. DF1 protocol consists of link layer and application layer formats. DF1 works over half duplex and full duplex modes of communication. </p>