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<p>Imported from Wikipedia (overwrite)</p>
<p><b>New page</b></p><div>'''DF-1''' / '''DF1''' protocol is an [[asynchronous serial communication|asynchronous]] byte-oriented protocol that is used to communicate with most [[Allen Bradley]] [[RS-232]] interface modules. DF1 protocol consists of link layer and application layer formats. DF1 works over half duplex and full duplex modes of communication.<br />
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==Application layer messages==<br />
Application layer message format consists of ''Command Initiator messages'' (request messages) and ''Command Executor'' (reply messages). Important command initiator messages are as follows.<br />
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* apply port configuration<br />
* bit write<br />
* change mode<br />
* close file<br />
* diagnostic status<br />
* disable forces<br />
* disable outputs<br />
* download request<br />
* echo<br />
* enable outputs<br />
* enable PLC scanning<br />
* enter download mode<br />
* enter upload mode<br />
* exit download/upload mode<br />
* file read<br />
* file write<br />
* get edit resource<br />
* initialize memory<br />
* modify PLC-2 compatibility file<br />
* open file<br />
* physical read<br />
* physical write<br />
* read bytes physical<br />
* read diagnostic counters<br />
* reset diagnostic counters<br />
* read link parameters<br />
* read-modify-write<br />
* read section size<br />
* restart request<br />
* set CPU mode<br />
* set data table size<br />
* set ENQs<br />
* set link parameters<br />
* set NAKs<br />
* set timeout<br />
* set variables<br />
* shutdown<br />
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==See also==<br />
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*[[Computer network]]ing<br />
*[[Computer science]]<br />
{{Clear}}<br />
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==External links==<br />
* [https://literature.rockwellautomation.com/idc/groups/literature/documents/rm/1770-rm516_-en-p.pdf DF1 Protocol Reference Manual]<br />
* [https://sourceforge.net/projects/abdf1/ DF1 protocol Open Source]<br />
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{{Automation protocols}}<br />
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[[Category:Industrial computing]]<br />
[[Category:Serial buses]]<br />
[[Category:Industrial automation]]<br />
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{{compu-network-stub}}</div>
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