IEEE 1701:2011 pdf free download

IEEE 1701:2011 pdf free download.IEEE Standard for Optical Port Communication Protocol to
Complement the Utility Industry End Device Data Tables.
Three layers are used to provide these communication capabilities. These are the Physical, Data Link, and Application layers.
With the default conditions established by this standard, the communication channel is considered always available once the physical connection has been completed. The required Identification Service is used to obtain the protocol version and revision in use by the C 12.18 Device. Certain communication parameters may be modified through the use of the Negotiate Service in the Application Layer. The Negotiate Service is optional and, if not implemented in the C 12.18 Device or not used during actual communications, the communication channel parameters shall remain at the default settings specified by this standard. Device implementers are strongly encouraged to implement this service.
Once the C12.18 Device identification and communication parameters have been established, the Application Layer provides Logon, Security, and Logoff services for session activation, access control and deactivation, Read and Write services for issuing data transmission requests, a Terminate service for shutdown of the communication channel, and a response structure that provides information regarding the success or failure of the service requests.
An example of a typical communications session would consist of the following services with appropriate responses, in the order listed: Identification, Negotiate, Logon, Security, Reads or Writes, Logoff and Terminate. Note that this brief’ example does not detail the packet structure or other aspects of the protocol. Annex A and Annex 13 contain examples with more detail.
4.2.2.4 Read service
The Read Service is used to transfer Table data to the requesting device and shall be initiated only during a session that was successfully established using the Logon Service.
At least one (I) form of the Read Service is required to be supported by a C 12.18 Device.
Request:
The Read Service request supports both complete and partial Table transfers. The retrieval of a portion of a Table is possible through the use of both index/element-count and offset/octet-count methods. The complete rule set for using these methods is enumerated in 4.2.2.12 and 4.2.2.14, respectively.
Codes 3011—3911, 3E11, and 3F11 are the Read Service request CodeS. Request code 3011 specifies a complete Table transfer. Request codes 3111 through 3911 specify a partial Table transfer using 1 to 9 indices. Request code 3EH specifics a default Table transfer. Request code 3FH specifics a partial Table transfer using the offset/octet-count method.