DF-1 / DF1 protocol is an
asynchronous
Asynchrony is any dynamic far from synchronization. If and as parts of an asynchronous system become more synchronized, those parts or even the whole system can be said to be in sync.
Asynchrony or asynchronous may refer to:
Electronics and com ...
byte-oriented protocol that is used to communicate with most
Allen Bradley RS-232
In telecommunications, RS-232 or Recommended Standard 232 is a standard introduced in 1960 for serial communication transmission of data. It formally defines signals connecting between a ''DTE'' (''data terminal equipment'') such as a compu ...
interface modules. DF1 protocol consists of link layer and application layer formats. DF1 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.
* apply port configuration
* bit write
* change mode
* close file
* diagnostic status
* disable forces
* disable outputs
* download request
* echo
* enable outputs
* enable PLC scanning
* enter download mode
* enter upload mode
* exit download/upload mode
* file read
* file write
* get edit resource
* initialize memory
* modify PLC-2 compatibility file
* open file
* physical read
* physical write
* read bytes physical
* read diagnostic counters
* reset diagnostic counters
* read link parameters
* read-modify-write
* read section size
* restart request
* set CPU mode
* set data table size
* set ENQs
* set link parameters
* set NAKs
* set timeout
* set variables
* shutdown
See also
*
Computer network
A computer network is a collection of communicating computers and other devices, such as printers and smart phones. In order to communicate, the computers and devices must be connected by wired media like copper cables, optical fibers, or b ...
ing
*
Computer science
Computer science is the study of computation, information, and automation. Computer science spans Theoretical computer science, theoretical disciplines (such as algorithms, theory of computation, and information theory) to Applied science, ...
External links
DF1 Protocol Reference ManualDF1 protocol Open Source
Industrial computing
Serial buses
Industrial automation
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